50 results on '"technical developments"'
Search Results
2. Accessing the energy-limited and sparsely populated deep biosphere: achievements and ongoing challenges of available technologies
- Author
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Yuki Morono
- Subjects
Subseafloor biosphere ,Low energy habitat ,Technical developments ,Limits of life ,Geography. Anthropology. Recreation ,Geology ,QE1-996.5 - Abstract
Abstract Microbes in marine sediments detected and counted by direct observation of membrane-filtered sediment samples stained with acridine orange. This technique can still be applied to high-biomass (> 105 cells/cm3) sedimentary habitats, such as organic-rich sediments collected in shallow areas near the seafloor. However, to further explore the nutrients and energy turnover under extremely low energy flux conditions, or in habitats that are close to the lower limit of the biosphere, technological breakthroughs have been required to increase the detection sensitivity for microbial life at densities of a few cells/cm3 of sediment. These technological developments contributed to increasing fundamental information on microbial life at the fringes of the subseafloor biosphere and led to the discovery of revivable microbes in sediments aged up to 101.5 million years old. More recently, chemical detection methods have revealed the existence of spores in the deep biosphere that are impermeable to conventional DNA stains. Previous applications of molecular biology-based approaches have been limited to relatively higher biomass samples, potentially because the cells surviving in these very low energy flux environments have less integrated genomes. Here, I review the contribution and importance of the technological developments that have been made in the study of microbes from the subseafloor biosphere, recent developments of alternative methods to microscopically detect microbial spores and their application to deep subseafloor sediments, and the challenges associated with applying molecular biological approaches to study low-biomass samples.
- Published
- 2023
- Full Text
- View/download PDF
3. Accessing the energy-limited and sparsely populated deep biosphere: achievements and ongoing challenges of available technologies.
- Author
-
Morono, Yuki
- Subjects
MARINE sediments ,TECHNOLOGICAL innovations ,ACRIDINE orange ,SEDIMENT sampling ,MICROORGANISMS ,SOIL microbial ecology ,BIOSPHERE ,GROUND penetrating radar - Abstract
Microbes in marine sediments detected and counted by direct observation of membrane-filtered sediment samples stained with acridine orange. This technique can still be applied to high-biomass (> 10
5 cells/cm3 ) sedimentary habitats, such as organic-rich sediments collected in shallow areas near the seafloor. However, to further explore the nutrients and energy turnover under extremely low energy flux conditions, or in habitats that are close to the lower limit of the biosphere, technological breakthroughs have been required to increase the detection sensitivity for microbial life at densities of a few cells/cm3 of sediment. These technological developments contributed to increasing fundamental information on microbial life at the fringes of the subseafloor biosphere and led to the discovery of revivable microbes in sediments aged up to 101.5 million years old. More recently, chemical detection methods have revealed the existence of spores in the deep biosphere that are impermeable to conventional DNA stains. Previous applications of molecular biology-based approaches have been limited to relatively higher biomass samples, potentially because the cells surviving in these very low energy flux environments have less integrated genomes. Here, I review the contribution and importance of the technological developments that have been made in the study of microbes from the subseafloor biosphere, recent developments of alternative methods to microscopically detect microbial spores and their application to deep subseafloor sediments, and the challenges associated with applying molecular biological approaches to study low-biomass samples. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
4. Evolution of Spine Surgery as a Request of Endoscopic and Microscopic Laser to Technology
- Author
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Lee, Sang-Ho, Jeong, Seong Kyun, Bae, Junseok, Bae, Junseok, editor, and Lee, Sang-Ho, editor
- Published
- 2021
- Full Text
- View/download PDF
5. PRINCIPIO DE PRECAUCIÓN EN EL DERECHO COMPARADO.
- Author
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Islas-Colín, Alfredo
- Subjects
- *
PRECAUTIONARY principle , *INTERNATIONAL courts , *COMPARATIVE law , *INTERNATIONAL trade , *HUMAN rights - Abstract
The institution of the precautionary principle in comparative law, background, basic elements in the doctrine, in a selection of international instruments and jurisprudential criteria of national courts of Mexico, France and Spain and international courts are analyzed in order to know the current scope. of the institution, reasoning used, fields of application (environment...) and dilemmas to protect human rights or international trade. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
6. Thrombektomie in der klinischen Praxis – Was lernen wir aus Registerstudien?
- Author
-
Tiedt, Steffen and Dorn, Franziska
- Abstract
Background: In 2015, randomized controlled trials (RCT) provided high-level evidence for the efficacy of endovascular thrombectomy in selected patients with acute ischemic stroke due to large vessel occlusion of the anterior circulation. Ever since, thrombectomy is strongly recommended for these patients and has been broadly implemented in clinical practice. Objective: To determine whether registry studies depicting real-life data provide additional information beyond RCTs. Material and methods: Literature review of RCTs and registry studies related to thrombectomy. Results: Data from registry studies on thrombectomy are important to 1. evaluate whether RCT results can be directly transferred into clinical practice, 2. comparatively describe the efficacy of thrombectomy in patient groups underrepresented in RCTs, such as older patients, 3. compare device performances and assess technical developments, and 4. determine how treatment processes and outcomes change over time. Conclusion: Beyond RCTs, registry studies are imperative for the continuous analysis and improvement of treatment processes and outcomes as well as technical devices in daily clinical practice. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
7. 3.1: Invited Paper: Electrowetting display: Towards full‐color video reflective display.
- Author
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Guo, Yuanyuan, Tang, Biao, Yuan, Dong, Bai, Pengfei, Li, Hao, Yi, Zichuan, Deng, Yong, Zhou, Rui, Zhong, Benpeng, Jang, Hongwei, Henzen, Alex, and Zhou, Guofu
- Subjects
ELECTROPHORETIC displays ,ELECTRONIC paper ,LIQUID crystal displays ,ELECTRONIC book readers ,LIGHT emitting diodes ,ORGANIC light emitting diodes ,VIDEOS - Abstract
Current mainstream display technologies include liquid crystal displays (LCD), Organic Light‐Emitting Diode (OLED), and electrophoretic paper displays (EPD). The electrowetting display (EWD) is expected to become a new member of the display family due to its fast response speed, paper‐like reflective display. In recent years, technology breakthroughs of electrowetting have been made in EWD. EWD has achieved playing dynamic videos with the comparable performance of LCD and displays print‐level color images. The current EWD has reached the color gamut NTS 50%, refresh time 12ms, and 260000 colors display. The potential applications of EWD including education, mobile terminals, e‐book readers, outdoor billboards, etc. The advantage of EWD will create new markets which are not accessible now. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
8. Frontiers of Sodium MRI Revisited: From Cartilage to Brain Imaging.
- Author
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Zaric, Olgica, Juras, Vladimir, Szomolanyi, Pavol, Schreiner, Markus, Raudner, Marcus, Giraudo, Chiara, and Trattnig, Siegfried
- Subjects
MAGNETIC resonance imaging ,BRAIN imaging ,GYROMAGNETIC ratio ,CARTILAGE ,HEART tumors - Abstract
Sodium magnetic resonance imaging (23Na‐MRI) is a highly promising imaging modality that offers the possibility to noninvasively quantify sodium content in the tissue, one of the most relevant parameters for biochemical investigations. Despite its great potential, due to the intrinsically low signal‐to‐noise ratio (SNR) of sodium imaging generated by low in vivo sodium concentrations, low gyromagnetic ratio, and substantially shorter relaxation times than for proton (1H) imaging, 23Na‐MRI is extremely challenging. In this article, we aim to provide a comprehensive overview of the literature that has been published in the last 10–15 years and which has demonstrated different technical designs for a range of 23Na‐MRI methods applicable for disease diagnoses and treatment efficacy evaluations. Currently, a wider use of 3.0T and 7.0T systems provide imaging with the expected increase in SNR and, consequently, an increased image resolution and a reduced scanning time. A great interest in translational research has enlarged the field of sodium MRI applications to almost all parts of the body: articular cartilage tendons, spine, heart, breast, muscle, kidney, and brain, etc., and several pathological conditions, such as tumors, neurological and degenerative diseases, and others. The quantitative parameter, tissue sodium concentration, which reflects changes in intracellular sodium concentration, extracellular sodium concentration, and intra–/extracellular volume fractions is becoming acknowledged as a reliable biomarker. Although the great potential of this technique is evident, there must be steady technical development for 23Na‐MRI to become a standard imaging tool. The future role of sodium imaging is not to be considered as an alternative to 1H MRI, but to provide early, diagnostically valuable information about altered metabolism or tissue function associated with disease genesis and progression. Level of Evidence: 1 Technical Efficacy Stage: 1 [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
9. De Paris à Biarritz avec Germaine Krull et Claude Farrère : Un voyage phototextuel à l’ère du développement de l’automobile
- Author
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Callens, Anne-Céline
- Subjects
publishing ,interwar period ,photographie ,entre-deux-guerres ,édition ,photographic avant-garde ,technical developments ,évolutions techniques ,photography ,avant-garde photographique - Abstract
Au début du xxe siècle, les nombreuses innovations techniques transforment le rapport de l’homme à l’espace, à la distance et au temps. L’automobile se démocratise et devient un sujet de prédilection pour les photographes modernistes. En 1931, les éditions Jacques Haumont publient La Route Paris-Biarritz, vue et photographiée par Germaine Krull, avec une préface de Claude Farrère. Ce récit présente la diversité du territoire parcouru. Mais il est aussi révélateur de la manière dont la technique – photographique et de déplacement – conditionne le voyage et son compte rendu. At the beginning of the 20th century, many technological innovations transformed man’s relationship to space, distance and time. The automobile is becoming more accessible. It became a predilection subject for modernist photographers. In 1931, the éditions Jacques Haumont published La Route Paris-Biarritz, seen and photographed by Germain Krull, with a preface by Claude Farrère. This book presents the diversity of the area travelled. But it is also a revealing example of how the technique – photographic and traveling – determines the journey and its narrative.
- Published
- 2023
10. Progress in Advanced Properties of Electrowetting Displays
- Author
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Yi Lu, Biao Tang, Guisong Yang, Yuanyuan Guo, Linwei Liu, and Alex Henzen
- Subjects
electrowetting display ,technical developments ,dielectric breakdown ,bi-stable ,optical stability ,Mechanical engineering and machinery ,TJ1-1570 - Abstract
Electrowetting display (EWD) has promising prospects in the electronic paper industry due to it having superior characteristics, such as the ability to provide a comfortable reading experience and quick response. However, in real applications, there are also problems related to dielectric deterioration, excess power consumption, optical instability and narrow color gamut etc. This paper reviewed the existing challenges and recent progress made in terms of improving the optical performance and reliability of EWD. First, the principle of electrowetting applied in small and confined configurations is introduced and the cause of the failure of the dielectric layer is analyzed. Then, the function of the pixel structures is described to avoid display defects. Next, electric signal modulations are compared in terms of achieving good image quality and optical stability. Lastly, the methods are presented for color panel realization. It was concluded that multi-layer dielectrics, three-dimensional pixel structures, proper electric frequency-and-amplitude modulation and an RGB color panel are expected to resolve the current limitations and contribute to designing advanced reflective displays.
- Published
- 2021
- Full Text
- View/download PDF
11. [Computed tomography versus magnetic resonance imaging : Pros and cons in axial spondyloarthritis].
- Author
-
Hermann KGA and Diekhoff T
- Subjects
- Humans, Sacroiliac Joint diagnostic imaging, Sacroiliac Joint pathology, Magnetic Resonance Imaging, Tomography, X-Ray Computed, Sacroiliitis diagnostic imaging, Axial Spondyloarthritis, Spondylarthritis diagnostic imaging, Spondylarthritis pathology, Spondylitis, Ankylosing pathology
- Abstract
The diagnosis of axial spondyloarthritis depends on direct visualization of the sacroiliitis in addition to clinical assessment and determination of the histocompatibility antigen HLA-B27. While the value of conventional radiographic images has meanwhile been described in many studies as insufficient to diagnose the disease at an early stage, magnetic resonance imaging and also computed tomography now offer the possibility to visualize findings, such as bone marrow edema, erosion, fat metaplasia, backfill and ankylosis. Thus, it is necessary to decide which procedure should be used and when. Furthermore, both cross-sectional imaging techniques are currently undergoing major changes, and technical advancements are making great strides every year. This article provides an overview of which future technologies will be included in the rheumatological diagnostics of the sacroiliac joints. This overview also illustrates which standard methods are established in the diagnostics of axial spondyloarthritis and how they are used., (© 2023. The Author(s), under exclusive licence to Springer Medizin Verlag GmbH, ein Teil von Springer Nature.)
- Published
- 2023
- Full Text
- View/download PDF
12. For God and Kaiser: The Imperial Austrian Army, 1619-1918
- Author
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Bassett, Richard, author and Bassett, Richard
- Published
- 2015
- Full Text
- View/download PDF
13. Буронабивные сваи с уширенным основанием – достойная альтернатива забивным сваям
- Author
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Чернюк, Владимир Петрович, Семенюк, Сергей Михайлович, Юськович, Виталий Иванович, Шляхова, Екатерина Ивановна, Чернюк, Владимир Петрович, Семенюк, Сергей Михайлович, Юськович, Виталий Иванович, and Шляхова, Екатерина Ивановна
- Abstract
В статье приведены преимущества буронабивных свай с уширениями перед аналогичными сваями без уширений и недостатки забивных свай. Основные достоинства таких свай сводятся к повышенной несущей способности по грунту основания при минимальном расходе бетона на их изготовление. Приведены прогрессивные конструкции устройств и приспособлений для образования уширений в забое скважин, защищенные патентами на изобретения и полезные модели РБ, а также а.с. СССР, и опубликованные за рубежом. Дан расчет несущей способности таких свай по грунту основания в связи с его отсутствием в отечественной нормативной литературе.
- Published
- 2021
14. [Thrombectomy in clinical practice-What do we learn from registry studies?]
- Author
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Steffen, Tiedt and Franziska, Dorn
- Subjects
Randomized controlled studies ,Schlaganfall ,Endovascular Procedures ,Real-world data ,Brain Ischemia ,Stroke ,Versorgungsrealität ,Endovaskuläre Therapie ,Randomisiert kontrollierte Studien ,Treatment Outcome ,Technical developments ,Leitthema ,Technische Entwicklungen ,Humans ,Endovascular treatment ,Registries ,Ischemic Stroke ,Thrombectomy - Abstract
In 2015, randomized controlled trials (RCT) provided high-level evidence for the efficacy of endovascular thrombectomy in selected patients with acute ischemic stroke due to large vessel occlusion of the anterior circulation. Ever since, thrombectomy is strongly recommended for these patients and has been broadly implemented in clinical practice.To determine whether registry studies depicting real-life data provide additional information beyond RCTs.Literature review of RCTs and registry studies related to thrombectomy.Data from registry studies on thrombectomy are important to 1. evaluate whether RCT results can be directly transferred into clinical practice, 2. comparatively describe the efficacy of thrombectomy in patient groups underrepresented in RCTs, such as older patients, 3. compare device performances and assess technical developments, and 4. determine how treatment processes and outcomes change over time.Beyond RCTs, registry studies are imperative for the continuous analysis and improvement of treatment processes and outcomes as well as technical devices in daily clinical practice.HINTERGRUND: Fünf randomisiert kontrollierte Studien (RCTs) konnten 2015 die Wirksamkeit der Thrombektomie bei selektierten Schlaganfallpatienten mit akuten proximalen Gefäßverschlüssen der vorderen Strombahn belegen und führten zur flächendeckenden Implementierung der Thrombektomie in die klinische Praxis.Es soll der Mehrwert, der sich über RCTs hinaus aus der registerbasierten Erfassung von Daten aus der klinischen Praxis ergibt, dargestellt werden.Durch eine Literaturreview wurden RCTs und Registerstudien identifiziert und ihre Ergebnisse, wenn möglich, in Relation zueinander gesetzt.Daten aus Thrombektomieregisterstudien sind wichtig um 1. die Übertragung der Ergebnisse aus RCTs in die klinische Praxis beurteilen zu können, 2. die Wirksamkeit der Thrombektomie in Patientengruppen, die in randomisierten Studien unterrepräsentiert waren, z. B. ältere Patienten, zu beschreiben, 3. die Performance von Devices vergleichen oder technische Weiterentwicklungen beurteilen zu können sowie 4. die Versorgungsqualität über die Zeit darzustellen.Über RCTs hinaus sind Registerstudien von großer Bedeutung für die kontinuierliche Analyse und Verbesserung von Behandlungsprozessen sowie technischer Entwicklungen.
- Published
- 2021
15. Progress in Advanced Properties of Electrowetting Displays
- Author
-
Guo Yuanyuan, Biao Tang, Linwei Liu, Yi Lu, Alex Henzen, and Guisong Yang
- Subjects
Computer science ,lcsh:Mechanical engineering and machinery ,02 engineering and technology ,Dielectric ,Review ,technical developments ,01 natural sciences ,law.invention ,Gamut ,Reliability (semiconductor) ,law ,0103 physical sciences ,Electronic engineering ,lcsh:TJ1-1570 ,Electronic paper ,Electrical and Electronic Engineering ,electrowetting display ,bi-stable ,010302 applied physics ,Dielectric strength ,Pixel ,dielectric breakdown ,Mechanical Engineering ,021001 nanoscience & nanotechnology ,optical stability ,Control and Systems Engineering ,Electrowetting ,RGB color model ,0210 nano-technology - Abstract
Electrowetting display (EWD) has promising prospects in the electronic paper industry due to it having superior characteristics, such as the ability to provide a comfortable reading experience and quick response. However, in real applications, there are also problems related to dielectric deterioration, excess power consumption, optical instability and narrow color gamut etc. This paper reviewed the existing challenges and recent progress made in terms of improving the optical performance and reliability of EWD. First, the principle of electrowetting applied in small and confined configurations is introduced and the cause of the failure of the dielectric layer is analyzed. Then, the function of the pixel structures is described to avoid display defects. Next, electric signal modulations are compared in terms of achieving good image quality and optical stability. Lastly, the methods are presented for color panel realization. It was concluded that multi-layer dielectrics, three-dimensional pixel structures, proper electric frequency-and-amplitude modulation and an RGB color panel are expected to resolve the current limitations and contribute to designing advanced reflective displays.
- Published
- 2021
16. The technical developments in Neo-Disney's feature computer animation.
- Author
-
Wu, Simiao
- Abstract
This paper examines the significant meaning of the master techniques that have been used in the Neo-Disney phase by Disney and its partners. The paper first introduces some of the main highlights of this technical development and its implementation as a key feature of mainstream filmmaking in the 21st century. Hyper-reality, stylize digital imagery and animation is a breakthrough CGI technique becoming the “must see” in animation films like Finding Nemo, Monsters and The Incredibles. Pixar's “hyper-reality” (Cutmall, 2000) as a stylized realism with a lifelike feel without actually being self-regulated has launched Neo-Disney's animation films into a whole new level. The purpose of this paper is to discuss the characteristics of Neo-Disney's technical developments including the influence through which technical developments have acquired meaning and success, and Neo-Disney has used Pixar's unique hyper-realist style through its technical developments. Finally, this paper draws a conclusion about what the technical developments in Neo-Disney's feature computer animation means to animation movie making. [ABSTRACT FROM PUBLISHER]
- Published
- 2012
- Full Text
- View/download PDF
17. De Paris à Biarritz avec Germaine Krull et Claude Farrère. Un voyage phototextuel à l’ère du développement de l’automobile
- Author
-
Anne-Céline CALLENS
- Subjects
publishing ,lcsh:Literature (General) ,inter-war period ,photographic avant-garde ,lcsh:PN1-6790 ,technical developments ,photography - Abstract
At the beginning of the 20th century, many technological innovations transformed man’s relationship to space, distance and time. The automobile is becoming more accessible. It became a predilection subject for modernist photographers. In 1931, the éditions Jacques Haumont published La Route Paris-Biarritz, seen and photographed by Germain Krull, with a preface by Claude Farrère. This book presents the diversity of the area travelled. But it is also a revealing example of how the technique – photographic and traveling – determines the journey and its narrative.
- Published
- 2020
18. Communications Under the Seas: The Evolving Cable Network and Its Implications
- Author
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Finn, Bernard, editor and Yang, Daqing, editor
- Published
- 2009
- Full Text
- View/download PDF
19. The Battle of Britain on Screen: 'The Few' in British Film and Television Drama
- Author
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Mackenzie, S.P., author and Mackenzie, S.P.
- Published
- 2007
- Full Text
- View/download PDF
20. Neuste Ergebnisse der endovenösen thermischen Verfahren in der Behandlung der Varikose.
- Author
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Noppeney, T. and Nüllen, H.
- Abstract
Copyright of Gefaesschirurgie is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2011
- Full Text
- View/download PDF
21. Cord blood banking for clinical transplantation.
- Author
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Rubinstein, P.
- Subjects
- *
TRANSPLANTATION of organs, tissues, etc. , *CORD blood , *BLOOD banks , *IMMUNE response , *BLOOD donors , *HLA histocompatibility antigens - Abstract
Cord blood (CB) stem and progenitor cells from related donors have been transplanted for past 20 years and from unrelated donors issued by public CB banks for 16 years. This brief look at public CB banking highlights aspects of its current status to suggest that accomplishing the currently required tasks, though no small undertaking, is not enough: much remains to be contributed. CB banking started in the 1930s, collecting blood for transfusion and showed that CB could be effectively collected, stored and administered intravenously without negative consequences. The realization that it contains hematopoietic ‘stem’ cells (actually, colony-forming units) followed discoveries elsewhere in hematopoiesis research, while HLA and unrelated BMT were being investigated. Progress in the exploration of ethnically stratified HLA allele frequencies, together with plausible neonatal (partial) immunological tolerance, seemed to predict initially frequent, unavoidable, but sufficiently tolerable HLA mismatching with CB grafts. Gluckman et al. and Boyse et al. proved that HLA-identical sibling CB grafts led to definitive engraftment. Technical developments in processing and freezing enabled public banks to accumulate large inventories and to supply grafts that could succeed despite major HLA incompatibility and low cell doses and provide hope for universal access to unrelated-donor transplantation. Public CB banking has thrived worldwide. Regulation and accreditation defined Good Tissue Practice in the CB banking environment and provided accepted do's, don't's and how to's. Startling advances continue to be made, not only technical, but including the description of molecular regulation in the function of natural killer and other cells involved in allogeneic recognition that will have dramatic effects and will permit further improvement in CB selection and use. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
22. Surgical treatment of pituitary tumours.
- Author
-
Buchfelder, Michael and Schlaffer, Sven
- Abstract
The surgical treatment of pituitary tumours underwent considerable evolution during the past centennial. Since Schloffer''s first description, excellent surgeons refined the surgical techniques, utilised hormonal measurements and imaging investigations at different times to define surgical success or failure. To date, transsphenoidal surgery is the approach of choice for over 90% of pituitary tumours, but still transcranial operations are needed even in experienced hands when asymmetrical and large pituitary tumours with minor intrasellar components present. When the indication for surgery stands, the complication rate to date is relatively low, particularly if the surgeon and his or her centre have sufficient experience in the field. In microadenomas, the success rate reported from expert authors approaches 90%. Generally speaking, patients with non-functioning pituitary adenomas, acromegaly, thyrotropinomas and Cushing''s disease are excellent candidates for primary surgical treatment. Re-operations are generally associated with less favourable outcomes. In prolactinomas, the primary therapy is medical; however, when dopamine agonists are not well tolerated or inefficient, an operative treatment should be considered. Although alternative medical treatments exist in acromegaly and thyrotropinomas, surgical treatment is relatively cheap. The implementation of endoscope-assisted, entirely endoscopic, image-guided surgery and intra-operative magnetic resonance (MR) imaging, particularly in combination with utilisation of the established microsurgical techniques, extends the surgical spectrum. Lesions become surgically accessible, which one did not dare to touch even a century ago. Moreover, it seems that the patient''s safety has increased and more patients have their tumours completely resected, which is equivalent to a higher remission rate in hormonally active tumours. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
23. Transcranial surgery for pituitary adenomas.
- Author
-
Buchfelder, Michael and Kreutzer, Juergen
- Abstract
Following a century of evolution and refinements in standard surgical techniques, the vast majority of operations for pituitary adenoma to date are performed utilizing transsphenoidal approaches. From current large series one obtains the impression that certainly less than 10% of these tumors require craniotomies. However, still several tumors, which’s volume is mainly localized outside of the sella require transcranial approaches, of which the pterional and subfrontal routes are the most widely used. The goal of surgical treatment is rapid eradication of the tumor mass, decompression of visual pathways and elimination of hormonal oversecretion whilst preserving the normal gland and avoiding potential surgical complications. Even with microsurgical techniques and standardized approaches, there is still some mortality associated with transcranial approaches and morbidity is undoubtly higher than with transsphenoidal operations. However, a selection bias must be considered, which shifts tumors with a larger size, less favourable prognosis and higher complication rate into the transcranial series. Moreover, with extended transsphenoidal approaches, lesions have become accessible for transsphenoidal surgery, which previously have been considered as contraindications. In this article current indications and limitations for transcranial surgery of pituitary adenomas, the preoperative workup, surgical techniques, results, and complications are briefly reviewed. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
24. Technical developments in radiology in Australasia dating from 1977.
- Author
-
Heggie, J.
- Abstract
This article outlines the enormous technological advances that have taken place in the practice of radiology in Australasia in the 30 years since approximately 1977. These developments have led to significant improvements in image quality across all modalities, including even general radiography, which had as its genesis Roentgen’s ground-breaking discovery of X-rays in 1895. However, nowhere has the development been more dramatic than in magnetic resonance imaging (MRI). This may be brought into stark reality by noting that the first MRI image of a human finger was produced in 1976 followed one year later by that of a human chest and the first MRI units were not installed in Australia and New Zealand until 1986 and 1991, respectively. The quality of these early images would be judged as laughable by today’s standards where the impressive isotropic imaging that can be achieved at sub-millimetre level by both MRI and CT could not have been dreamed of 30 years ago. The review also highlights some challenges for the future of the medical physics profession. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
25. MRA of abdominal vessels: technical advances.
- Author
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Michaely, Henrik J., Dietrich, Olaf, Nael, Kambiz, Weckbach, Sabine, Reiser, Maximilian F., and Schoenberg, Stefan O.
- Subjects
- *
ANGIOGRAPHY , *MEDICAL radiography , *MAGNETIC resonance imaging , *SCANNING systems , *RADIOSCOPIC diagnosis - Abstract
Magnetic resonance angiography (MRA) in general and MRA of the abdominal vessels in particular have undergone substantial improvements in the past 5 years triggered by the introduction and application of parallel imaging (PI), new sequence techniques such as centric k-space trajectories and undersampling, dedicated contrast agents and clinical high-field scanners. All of these techniques have the potential to improve image quality and resolution or decrease the image acquisition time. However, each of them has its own specific advantages and drawbacks. This review describes the main technical innovations and focuses on the impact these developments may have on abdominal MRA. Special consideration is given to the interaction of these various technical advances. The clinical value of advanced MRA techniques is discussed and illustrated by characteristic cases. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
26. Child psychotherapy then and now.
- Author
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Miller, Lisa
- Subjects
- *
CHILD psychotherapy , *DEPRIVATION (Psychology) , *MENTAL health , *CHILD psychology , *CHILD mental health services , *PSYCHIATRY , *THERAPEUTICS - Abstract
The following is the text of an introductory presentation given on the occasion of the 40th Birthday Conference of the Journal of Child Psychotherapy. It provides an historical overview of the Journal's development, and in particular compares and contrasts the first two issues of the Journal with the two most recent. The importance of research is emphasised. [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF
27. Heutiger Stand und zukünftige Entwicklungen in der Mehrschichtcomputertomographie.
- Author
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Flohr, T., Ohnesorge, B., and Schaller, S.
- Abstract
Copyright of Der Radiologe is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2004
- Full Text
- View/download PDF
28. Specificity of translator’s multi-competence in medical thematic texts including additional technical innovations
- Subjects
medicine ,глобалізація ,науково-технічний прогрес ,translation ,переклад ,технічні розробки ,technical developments ,scientific and technological progress ,медицина ,globalization - Abstract
Ця стаття присвячена дослідженню специфіки перекладу тексту, який значно вирізняється з-поміж інших наукових текстів комбінуванням біологічного та технічного складників. Такі різновиди текстів з’явилися нещодавно та потребують ретельного дослідження. Цей текст характеризується не тільки цікавим і складним науковим викладом матеріалу, але й широким спектром специфічних медичних термінів, назвами людських органів, їх взаємодією та протезуванням, враховуючи новітні технічні розробки в організмі людини для заміни їх біологічних попередників. Переклад таких текстів викликає багато труднощів також тому, що перекладач повинен бути компетентним у сфері останніх медичних розробок сьогодення, що часто стає важким завданням для нього (або неї), адже з таким стрімким розвитком науково-технічного прогресу майже не можливо бути обізнаним з усіма сучасними науковими розробками. Медична сфера є однією з найскладніших для перекладачів, адже потребує наявності базових знань із біології, хімії, фармакології та медицини. У світі сучасних новітніх технологій і науково-технічного прогресу, стрімкого розвитку науки медичні винаходи та відкриття вимагають від перекладачів, які працюють у цій сфері, неабиякої сумлінної підготовки та знань у цій галузі. Не слід забувати також про те, що з появою нових винаходів, обладнання та технологій перекладачу необхідно не тільки надати достовірний та адекватний переклад, а й пояснити, чим є той чи інший термін або якесь новітнє медичне обладнання чи винахід, вдаючись до засобу конкретизації при перекладі. В іншому випадку переклад просто не буде зрозумілим, що зробить роботу перекладача недостовірною, а переклад – некоректним. У наш час в процесі глобалізації та науково-технічного прогресу стає надзвичайно важливим питання мультикомпетенції перекладача. Кожен перекладач володіє своєю унікальною та специфічною комунікативною моделлю. І поява нових суміжних наукових галузей вимагає від кожного професіонала отримання нових навичок та оволодіння більшою кількістю знань у різних сферах перекладу. This article deals with the study of the specificity of text translation, which differs significantly from other scientific texts by means of combining both biological and technical components. Such variations of texts appeared not so long ago and require careful study. This text is characterized not only by an interesting and complex scientific presentation of the material, but also by a wide range of specific medical terms, names of human organs, their interaction and prosthetics, taking into account the latest technical developments in the sphere of human body for replacement of biological organs. It is well known that medical sphere is one of the most difficult for translators, because it requires at least some basic knowledge on biology, chemistry, pharmacology and medicine. With the advancement of scientific and technological progress, medicine began to interact with the latest technical developments of Western scientists and soon found itself in the sphere of translation, causing considerable demand for particularly this kind of translation. Nowadays, in the process of globalization and scientific and technological progress, the issue of translator’s multi-competence becomes extremely important. Globalization processes that have spread all over the world recently are contributing new knowledge and technologies to many countries, making the demand for translation in medical sphere extremely popular and necessary. However, there is a problem of finding a qualified professional who will be able to provide the client with an adequate kind of translation. In our research the medical text was explored as a combination of biological and technical components as a strongly unified combination into a single locus. We got used to the fact that these two scientific spheres (biological and technical) have always been separated from each other but this research explores the combination of these two spheres of science as the one united locus. According to the results of our research, such kind of texts can be useful for students as they can provide at least some minimal knowledge on both biological and technical spheres and can broaden their outlook. However this topic is rather new and needs more detailed exploration in future.
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- 2020
29. Frontiers of Sodium MRI Revisited: From Cartilage to Brain Imaging
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Olgica Zaric, Markus M. Schreiner, Vladimir Juras, Marcus Raudner, Pavol Szomolanyi, Chiara Giraudo, and Siegfried Trattnig
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Cartilage, Articular ,Sodium ,chemistry.chemical_element ,Neuroimaging ,Review Article ,clinical applications ,technical developments ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,In vivo ,Extracellular fluid ,medicine ,Radiology, Nuclear Medicine and imaging ,Review Articles ,sodium ,medicine.diagnostic_test ,business.industry ,Cartilage ,Brain ,Magnetic resonance imaging ,Magnetic Resonance Imaging ,Biomarker (cell) ,medicine.anatomical_structure ,chemistry ,Sodium MRI ,business ,MRI ,Biomedical engineering - Abstract
Sodium magnetic resonance imaging (23 Na-MRI) is a highly promising imaging modality that offers the possibility to noninvasively quantify sodium content in the tissue, one of the most relevant parameters for biochemical investigations. Despite its great potential, due to the intrinsically low signal-to-noise ratio (SNR) of sodium imaging generated by low in vivo sodium concentrations, low gyromagnetic ratio, and substantially shorter relaxation times than for proton (1 H) imaging, 23 Na-MRI is extremely challenging. In this article, we aim to provide a comprehensive overview of the literature that has been published in the last 10-15 years and which has demonstrated different technical designs for a range of 23 Na-MRI methods applicable for disease diagnoses and treatment efficacy evaluations. Currently, a wider use of 3.0T and 7.0T systems provide imaging with the expected increase in SNR and, consequently, an increased image resolution and a reduced scanning time. A great interest in translational research has enlarged the field of sodium MRI applications to almost all parts of the body: articular cartilage tendons, spine, heart, breast, muscle, kidney, and brain, etc., and several pathological conditions, such as tumors, neurological and degenerative diseases, and others. The quantitative parameter, tissue sodium concentration, which reflects changes in intracellular sodium concentration, extracellular sodium concentration, and intra-/extracellular volume fractions is becoming acknowledged as a reliable biomarker. Although the great potential of this technique is evident, there must be steady technical development for 23 Na-MRI to become a standard imaging tool. The future role of sodium imaging is not to be considered as an alternative to 1 H MRI, but to provide early, diagnostically valuable information about altered metabolism or tissue function associated with disease genesis and progression. LEVEL OF EVIDENCE: 1 TECHNICAL EFFICACY STAGE: 1.
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- 2020
30. Features of selecting potential investors for scientific and technical developments
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Chekunova-Tomacheva, N. L., Uskova, I. E., Mamuzić, Ilija, and Mamuzić, Ilija
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scientific developments ,technical developments ,investment ,innovation ,economy - Abstract
For the correct choice of the ratio “investor- innovation-oriented scientific development”, i.e. which potential investor should be placed on the sale of a particular innovation-oriented scientific development, it is necessary to conduct: - technical analysis, on the basis of which the most suitable for this innovation- oriented scientific development technique and technology is determined ; - commercial analysis, covering the analysis of the sales market of the products that can be produced as a result of the implementation of an innovation-oriented scientific development ; - institutional analysis, whose task is to assess the legal, administrative and commercial environment in which innovation-oriented scientific developments will be implemented and adapt them to this environment ; - financial analysis.
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- 2020
31. Photosensitivity in optical fiber waveguides: from discovery to commercialization.
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Hill, K.O.
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The photosensitivity of germanium-doped-core optical fibers was discovered more than twenty years ago. The discovery provided a means for photoimprinting gratings in the core of optical fibers, and eventually photosensitivity became an important technology for fiber-optic communications. The paper recounts briefly the story of the photosensitivity of optical fiber waveguides and the significant developments that occurred on the journey from its discovery to its commercialization as is often the case with many inventions, the discovery was serendipitous. Furthermore, several technical and nontechnical developments were necessary before the discovery could be exploited commercially. In the case of photosensitivity, the time span from discovery to commercialization was relatively long-about 15 years [ABSTRACT FROM PUBLISHER]
- Published
- 2000
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32. Avenir de la radiologie interventionnelle
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Rousseau, Hervé, Vernhet-Kovacsik, Hélène, Mouroz, Paul Revel, Otal, Philippe, Meyrignac, Olivier, Mokrane, Fatima Zhora, Service de Radiologie [Rangueil / Larrey], CHU Toulouse [Toulouse]-Hôpital de Rangueil, CHU Toulouse [Toulouse], Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), and Hôpital de Rangueil
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Radiologie interventionnelle (RI) ,Oncology ,Technical developments ,[SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging ,Quality of care ,Oncologie ,[SDV.CAN]Life Sciences [q-bio]/Cancer ,Évolutions techniques ,Médecine personnalisée ,Qualité des soins ,Personalized medicine ,Interventional radiology (IR) - Abstract
International audience; Imaging-guided interventions or interventional radiology (IR) are intended to improve the efficiency and accuracy of the medical procedure regardless of the organ, as well as the safety and comfort of the patient. Currently IR concerns all medico-surgical specialties with a number of acts constantly increasing, and is today a major field of innovation that responds to a strong societal demand to move towards more and more effective treatments, but also less and less invasive. The ambulatory shift in IR is a major prospect of saving and improving the quality of care. In the field of innovations, technical developments are major for both guidance methods and interventional radiology equipment. These developments affect all organ pathologies, but it is certainly in the field of oncology that progress is fastest, with personalized medicine with new drugs targeted to optimize tolerance to treatment and maximize effects. The aim of this article is to make this specialty better known, its organization both in terms of training and the permanence of care.; Les interventions guidées par l’imagerie ont pour but d’améliorer l’efficacité et la précision du geste médical quel que soit l’organe, ainsi que la sécurité et le confort du patient. La radiologie interventionnelle (RI) concerne actuellement l’ensemble des spécialités médico-chirurgicales et un nombre d’actes en constante augmentation. La RI correspond à un champ majeur d’innovation qui répond à une forte demande sociétale d’aller vers des traitements de plus en plus efficaces, et de moins en moins invasifs. Le virage ambulatoire en RI est une perspective majeure d’économie et d’amélioration de la qualité des soins. Les évolutions techniques sont majeures aussi bien pour les méthodes de guidage que pour le matériel de radiologie interventionnelle. Ces évolutions touchent toutes les pathologies d’organe, mais c’est certainement dans le domaine de l’oncologie que les progrès actuels sont les plus rapides, avec une médecine personnalisée et de nouveaux médicaments ciblés pour optimiser la tolérance au traitement et maximiser les effets. L’objectif de cet article est de mieux faire connaître cette spécialité et son organisation aussi bien sur le plan de la formation que sur celui de la permanence des soins.
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- 2019
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33. Use of Caval Subtraction 2D Phase-Contrast MR Imaging to Measure Total Liver and Hepatic Arterial Blood Flow: Preclinical Validation and Initial Clinical Translation
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Chouhan, Manil D., Mookerjee, Rajeshwar P., Bainbridge, Alan, Walker-Samuel, Simon, Davies, Nathan, Halligan, Steve, Lythgoe, Mark F., and Taylor, Stuart A.
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Adult ,Male ,Contrast Media ,Reproducibility of Results ,Magnetic Resonance Imaging ,Healthy Volunteers ,Rats ,Rats, Sprague-Dawley ,Hepatic Artery ,Subtraction Technique ,Models, Animal ,Technical Developments ,Animals ,Humans ,Female ,Blood Flow Velocity ,Original Research ,Liver Circulation ,Ultrasonography - Abstract
Caval subtraction phase-contrast MR imaging is technically feasible and may offer a reproducible and clinically viable method for measuring total liver blood flow and hepatic arterial flow., Purpose To validate caval subtraction two-dimensional (2D) phase-contrast magnetic resonance (MR) imaging measurements of total liver blood flow (TLBF) and hepatic arterial fraction in an animal model and evaluate consistency and reproducibility in humans. Materials and Methods Approval from the institutional ethical committee for animal care and research ethics was obtained. Fifteen Sprague-Dawley rats underwent 2D phase-contrast MR imaging of the portal vein (PV) and infrahepatic and suprahepatic inferior vena cava (IVC). TLBF and hepatic arterial flow were estimated by subtracting infrahepatic from suprahepatic IVC flow and PV flow from estimated TLBF, respectively. Direct PV transit-time ultrasonography (US) and fluorescent microsphere measurements of hepatic arterial fraction were the standards of reference. Thereafter, consistency of caval subtraction phase-contrast MR imaging–derived TLBF and hepatic arterial flow was assessed in 13 volunteers (mean age, 28.3 years ± 1.4) against directly measured phase-contrast MR imaging PV and proper hepatic arterial inflow; reproducibility was measured after 7 days. Bland-Altman analysis of agreement and coefficient of variation comparisons were undertaken. Results There was good agreement between PV flow measured with phase-contrast MR imaging and that measured with transit-time US (mean difference, −3.5 mL/min/100 g; 95% limits of agreement [LOA], ±61.3 mL/min/100 g). Hepatic arterial fraction obtained with caval subtraction agreed well with those with fluorescent microspheres (mean difference, 4.2%; 95% LOA, ±20.5%). Good consistency was demonstrated between TLBF in humans measured with caval subtraction and direct inflow phase-contrast MR imaging (mean difference, −1.3 mL/min/100 g; 95% LOA, ±23.1 mL/min/100 g). TLBF reproducibility at 7 days was similar between the two methods (95% LOA, ±31.6 mL/min/100 g vs ±29.6 mL/min/100 g). Conclusion Caval subtraction phase-contrast MR imaging is a simple and clinically viable method for measuring TLBF and hepatic arterial flow. Online supplemental material is available for this article.
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- 2016
34. Percutaneous introducibility of the expandable vascular sheath system and injury potential of balloon-assisted thrombectomy: preliminary In vivo results.
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Brossmann, Joachim, Haghighi, Parviz, Bookstein, Joseph J., Brossmann, J, Haghighi, P, and Bookstein, J J
- Abstract
Purpose: To test the percutaneous introducibility of the expandable vascular sheath (EVS) system and the safety of percutaneous balloon-assisted thrombectomy.Methods: The EVS was inserted directly (n = 9) or through a 9.5 Fr regular vascular introducer sheath (n = 9) into the femoral arteries and veins and carotid arteries in four dogs (18-21 kg). Balloon-assisted thrombectomies were simulated in iliac arteries. Histologic examinations were done at sites of funnel deployment immediately (n = 4) and 25 days (n = 8) after the intervention.Results: The EVS was successfully introduced into six of nine vessels by a direct percutaneous approach. Balloon-assisted thrombectomy using the EVS device caused localized intimal denudation, disruption of the internal elastic lamina, and mild hemorrhages into the media; one arterial dissection at the site of funnel deployment was seen. All indirect insertions and funnel deployments were successful. Twenty-five days after the experiments, intimal hyperplasia was noted in all cases.Conclusion: Percutaneous balloon-assisted thrombectomy may cause mild vascular injuries. Direct percutaneous introduction of the EVS device cannot be recommended yet. [ABSTRACT FROM AUTHOR]- Published
- 1999
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35. Swelling pressure equilibrium of physical networks in the field of an analytical ultracentrifuge.
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Holtus, G. and Borchard, W.
- Abstract
Investigations of the swelling pressure equilibria of a physical network are performed with an analytical ultracentrifuge. The advantage of this method is that in contrast to the known swelling pressure instruments, swelling pressures in a range of composition are obtained from only a single equilibrium experiment. The Schlieren optical system of the ultracentrifuge allows the observation of the concentration gradient during the process of deswelling and swelling, and furthermore, the detection of the gel concentration at every point. The system gelatin/water shows a different behavior than that expected from the theory of Flory-Huggins for a swollen random network. The measured curves of concentration vs. the swelling pressure intersect each other in case of low initial concentrations. This shows that these networks are inhomogeneous. A new method to measure and evaluate the Schlieren pattern is described. [ABSTRACT FROM AUTHOR]
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- 1989
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36. Challenging tumour immunological techniques that help to track cancer stem cells in malignant melanomas and other solid tumours
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Vanda Plótár, Beatrix Kotlan, Andras Szollar, Tímea Balatoni, Emil Farkas, Miklós Kásler, Istvan Vamosi-Nagy, Szabolcs Horvath, Klara Eles, Ákos Sávolt, Mihály Újhelyi, J. Tóth, Orsolya Csuka, Gabriella Liszkay, and Laszlo S. Toth
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cancer stem cells ,education.field_of_study ,Original Paper ,Phage display ,biology ,business.industry ,tumour immunology ,Population ,malignant melanomas ,Cancer ,medicine.disease ,technical developments ,Oncology ,Antigen ,Cancer stem cell ,Cancer cell ,biology.protein ,Cancer research ,Medicine ,Immunohistochemistry ,Radiology, Nuclear Medicine and imaging ,Antibody ,business ,education - Abstract
Aim of the study The arsenal of questions and answers about the minor cancer initiating cancer stem cell (CSC) population put responsible for cancer invasiveness and metastases, has left with an unsolved puzzle. Specific aims of a complex project were partly focused on revealing new biomarkers of cancer. We designed and set up novel techniques to facilitate the detection of cancerous cells. Materials and methods As a novel approach, we investigated B cells infiltrating breast carcinomas and melanomas (TIL-B) in terms of their tumour antigen binding potential. By developing the TIL-B phage display technology we provide here a new technology for the specific detection of highly tumour-associated antigens. Single chain Fv (scFv) antibody fragment phage ELISA, immunofluorescence (IF) FACS analysis, chamber slide technique with IF confocal laser microscopy and immunohistochemistry (IHC) in paraffin-embedded tissue sections were set up and standardized. Results We showed strong tumour-associated disialylated glycosphingolipid expression levels on various cancer cells using scFv antibody fragments, generated previously by uniquely invasive breast carcinoma TIL-B phage display library technology. Conclusions We report herein a novel strategy to obtain antibody fragments of human origin that recognise tumour-associated ganglioside antigens. Our investigations have the power to detect privileged molecules in cancer progression, invasiveness, and metastases. The technical achievements of this study are being harnessed for early diagnostics and effective cancer therapeutics.
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- 2018
37. Progress in Advanced Properties of Electrowetting Displays.
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Lu, Yi, Tang, Biao, Yang, Guisong, Guo, Yuanyuan, Liu, Linwei, Henzen, Alex, and Papathanasiou, Athanasios G.
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ELECTRONIC paper ,OPTICAL images ,ELECTRONIC industries ,DIELECTRIC breakdown ,PAPER industry - Abstract
Electrowetting display (EWD) has promising prospects in the electronic paper industry due to it having superior characteristics, such as the ability to provide a comfortable reading experience and quick response. However, in real applications, there are also problems related to dielectric deterioration, excess power consumption, optical instability and narrow color gamut etc. This paper reviewed the existing challenges and recent progress made in terms of improving the optical performance and reliability of EWD. First, the principle of electrowetting applied in small and confined configurations is introduced and the cause of the failure of the dielectric layer is analyzed. Then, the function of the pixel structures is described to avoid display defects. Next, electric signal modulations are compared in terms of achieving good image quality and optical stability. Lastly, the methods are presented for color panel realization. It was concluded that multi-layer dielectrics, three-dimensional pixel structures, proper electric frequency-and-amplitude modulation and an RGB color panel are expected to resolve the current limitations and contribute to designing advanced reflective displays. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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38. Fourier X-ray Scattering Radiography Yields Bone Structural Information
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Han Wen, Eric E. Bennett, Stanislas Rapacchi, and Monica M. Hegedus
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genetic structures ,Bone density ,Swine ,Quantitative Biology::Tissues and Organs ,Radiography ,Physics::Medical Physics ,Bone and Bones ,Statistics, Nonparametric ,symbols.namesake ,Optics ,Bone Density ,Technical Developments ,Animals ,Scattering, Radiation ,Medicine ,Radiology, Nuclear Medicine and imaging ,Fourier Analysis ,business.industry ,Scattering ,X-Rays ,Attenuation ,X-ray ,Rats ,Fourier transform ,medicine.anatomical_structure ,Fourier analysis ,symbols ,Cortical bone ,business - Abstract
To characterize certain aspects of the microscopic structures of cortical and trabecular bone by using Fourier x-ray scattering imaging.Protocols approved by the National Institutes of Health Animal Care and Use Committee were used to examine ex vivo the hind limb of a rat and the toe of a pig. The Fourier x-ray scattering imaging technique involves the use of a grid mask to modulate the cone beam and Fourier spectral filters to isolate the harmonic images. The technique yields attenuation, scattering, and phase-contrast (PC) images from a single exposure. In the rat tibia cortical bone, the scattering signals from two orthogonal grid orientations were compared by using Wilcoxon signed rank tests. In the pig toe, the heterogeneity of scattering and PC signals was compared between trabecular and compact bone regions of uniform attenuation by using F tests.In cortical bone, the scattering signal was significantly higher (P10(-15)) when the grid was parallel to the periosteal surface. Trabecular bone, as compared with cortical bone, appeared highly heterogeneous on the scattering (P10(-34)) and PC (P10(-27)) images.The ordered alignment of the mineralized collagen fibrils in compact bone was reflected in the anisotropic scattering signal in this bone. In trabecular bone, the porosity of the mineralized matrix accounted for the granular pattern seen on the scattering and PC images.
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- 2009
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39. Coronary Artery Anomalies and Variants: Technical Feasibility of Assessment with Coronary MR Angiography at 3 T
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Douglas R. Rosing, Matthias Stuber, Roderic I. Pettigrew, Daniel A. Herzka, Andrew E. Arai, Vincent B. Ho, and Ahmed M. Gharib
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Adult ,Male ,medicine.medical_specialty ,Adolescent ,Coronary Vessel Anomalies ,Magnetic resonance angiography ,Flip angle ,medicine ,Humans ,Technical Developments ,Radiology, Nuclear Medicine and imaging ,Voxel size ,medicine.diagnostic_test ,business.industry ,Mr angiography ,Magnetic resonance imaging ,Middle Aged ,Institutional review board ,Coronary Vessels ,medicine.anatomical_structure ,Angiography ,Female ,Radiology ,business ,Magnetic Resonance Angiography ,Dilatation, Pathologic ,Artery - Abstract
The purpose of this study was to prospectively use a whole-heart three-dimensional (3D) coronary magnetic resonance (MR) angiography technique specifically adapted for use at 3 T and a parallel imaging technique (sensitivity encoding) to evaluate coronary arterial anomalies and variants (CAAV). This HIPAA-compliant study was approved by the local institutional review board, and informed consent was obtained from all participants. Twenty-two participants (11 men, 11 women; age range, 18-62 years) were included. Ten participants were healthy volunteers, whereas 12 participants were patients suspected of having CAAV. Coronary MR angiography was performed with a 3-T MR imager. A 3D free-breathing navigator-gated and vector electrocardiographically-gated segmented k-space gradient-echo sequence with adiabatic T2 preparation pulse and parallel imaging (sensitivity encoding) was used. Whole-heart acquisitions (repetition time msec/echo time msec, 4/1.35; 20 degrees flip angle; 1 x 1 x 2-mm acquired voxel size) lasted 10-12 minutes. Mean examination time was 41 minutes +/- 14 (standard deviation). Findings included aneurysms, ectasia, arteriovenous fistulas, and anomalous origins. The 3D whole-heart acquisitions developed for use with 3 T are feasible for use in the assessment of CAAV.
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- 2008
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40. Investing in new technologies
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Helm, Dieter, author
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- 2012
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41. The Internet and Four Dimensions of Citizenship
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Neuman, W. Russell, Bimber, Bruce, Hindman, Matthew, Edwards, George C., book editor, Jacobs, Lawrence R., book editor, and Shapiro, Robert Y., book editor
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- 2011
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42. Treatment of pituitary tumors: Surgery
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Buchfelder, Michael
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- 2005
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43. Subtractionless first-pass single contrast medium dose peripheral MR angiography using two-point Dixon fat suppression
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Bastiaan Versluis, Holger Eggers, Eveline Alberts, Liesbeth Geerts, Jesse Habets, Tim Leiner, Niels Blanken, Evert-Jan Vonken, Jeroen Hendrikse, Beeldvorming, Cardiologie, and RS: CARIM School for Cardiovascular Diseases
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Adult ,Male ,medicine.medical_specialty ,Adolescent ,Image quality ,media_common.quotation_subject ,Contrast Media ,Image subtraction ,Signal-To-Noise Ratio ,Magnetic resonance angiography ,Imaging phantom ,Peripheral Arterial Disease ,Young Adult ,Peripheral arterial occlusive disease ,Image Processing, Computer-Assisted ,medicine ,Humans ,Contrast (vision) ,Radiology, Nuclear Medicine and imaging ,Child ,Aged ,Neuroradiology ,media_common ,Aged, 80 and over ,Observer Variation ,medicine.diagnostic_test ,Phantoms, Imaging ,business.industry ,Subtraction ,Angiography, Digital Subtraction ,Magnetic resonance imaging ,General Medicine ,Middle Aged ,Dixon water-fat imaging ,Adipose Tissue ,Subtraction Technique ,cardiovascular system ,Feasibility Studies ,Female ,Radiology ,business ,Nuclear medicine ,Magnetic resonance ,technical developments ,Arteries ,lower extremity - Abstract
To investigate the feasibility of subtractionless first-pass single contrast medium dose (0.1 mmol/kg) peripheral magnetic resonance angiography (MRA) at 1.5 T using two-point Dixon fat suppression and compare it with conventional subtraction MRA in terms of image quality. Twenty-eight patients (13 male, 15 female; mean age ± standard deviation, 66 ± 16 years) with known or suspected peripheral arterial disease underwent subtractionless and subtraction first-pass MRA at 1.5 T using two-point Dixon fat suppression. Results were compared with regard to vessel-to-background contrast. A phantom study was performed to assess the signal-to-noise ratio (SNR) of both MRA techniques. Two experienced observers scored subjective image quality. Agreement regarding subjective image quality was expressed in quadratic weighted κ values. Vessel-to-background contrast improved in all anatomical locations with the subtractionless method versus the subtraction method (all P
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- 2013
44. Cardiovascular computed tomography : technical developments and clinical applications
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Bijl, N. van der, Roos, A. de, Kroft, L.J.M., Huisman, M.V., and Leiden University
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Technical developments ,Pulmonary embolism ,Cardiac CT ,Coronary artery disease ,health care economics and organizations ,humanities - Abstract
Chapter 1 reviews technical developments of cardiac CT and current status, recommendations and future perspective of various clinical cardiac CT applications. In chapter 2, the eff ect of dose reduction on diagnostic performance in CT coronary angiography is assessed. Chapter 3 evaluates the eff ect of thin-slice image reconstructions on coronary artery calcium measurements. In chapter 4, the assessment of Agatston scores using coronary CT angiography is studied. Chapter 5 evaluates the predictive value of CT-derived RV/LV ratios and cardiac biomarkers for short term clinical outcome in patients with suspected acute PE. In chapter 6, the incremental value of ventricular function with ECG-synchronized cardiac CT over standard pulmonary CTA-derived RV/LV ratios for predicting clinical outcome in patients with suspected acute PE is discussed. Chapter 7 studies the influence of timing of NT-pro-BNP sampling for predicting adverse clinical outcome.
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- 2011
45. Ankle: isotropic MR imaging with 3D-FSE-cube--initial experience in healthy volunteers
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Garry E. Gold, Kathryn J. Stevens, Reed F. Busse, Anja C. S. Brau, Philip James Beatty, Christopher F. Beaulieu, and Eric T. Han
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Adult ,Male ,medicine.medical_specialty ,Imaging, Three-Dimensional ,Healthy volunteers ,medicine ,Humans ,Technical Developments ,Radiology, Nuclear Medicine and imaging ,Prospective Studies ,medicine.diagnostic_test ,business.industry ,Healthy subjects ,Magnetic resonance imaging ,Pulse sequence ,Mr imaging ,Magnetic Resonance Imaging ,medicine.anatomical_structure ,Female ,Radiology ,Parallel imaging ,Ankle ,Cube ,business ,Nuclear medicine - Abstract
The purpose of this prospective study was to compare a new isotropic three-dimensional (3D) fast spin-echo (FSE) pulse sequence with parallel imaging and extended echo train acquisition (3D-FSE-Cube) with a conventional two-dimensional (2D) FSE sequence for magnetic resonance (MR) imaging of the ankle. After institutional review board approval and informed consent were obtained and in accordance with HIPAA privacy guidelines, MR imaging was performed in the ankles of 10 healthy volunteers (four men, six women; age range, 25–41 years). Imaging with the 3D-FSE-Cube sequence was performed at 3.0 T by using both one-dimensional– and 2D-accelerated autocalibrated parallel imaging to decrease imaging time. Signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) with 3D-FSE-Cube were compared with those of the standard 2D FSE sequence. Cartilage, muscle, and fluid SNRs were significantly higher with the 3D-FSE-Cube sequence (P < .01 for all). Fluid-cartilage CNR was similar for both techniques. The two sequences were also compared for overall image quality, blurring, and artifacts. No significant difference for overall image quality and artifacts was demonstrated between the 2D FSE and 3D-FSE-Cube sequences, although the section thickness in 3D-FSE-Cube imaging was much thinner (0.6 mm). However, blurring was significantly greater on the 3D-FSE-Cube images (P < .04). The 3D-FSE-Cube sequence with isotropic resolution is a promising new MR imaging sequence for viewing complex joint anatomy.
- Published
- 2008
46. Einsatz der digitalen Mammographie in der Brustkrebsdiagnostik
- Author
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Diekmann, Felix
- Subjects
advanced applications ,digital mammography ,technical developments ,600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit - Abstract
Titelseite und Inhaltsverzeichnis Einführung und Problemstellung 3 1\. Aktueller Stand digitaler Mammographie 6 1.1 Unterschiede zwischen konventioneller und digitaler Mammographie 6 1.2 Digitale Mammographiesysteme 8 1.3 Technische Parameter digitaler Mammographiesysteme 11 2\. Dosisreduktion: aktueller Stand und zukünftiges Potenzial 14 2.1 Dosisreduktion bei Lokalisierungsprozeduren 14 2.2 Dosisreduktion bei Spezialaufnahmen 17 2.3 Dosisreduktion durch rasterlose Technik 18 3\. Software: weiterführende Anwendungen 19 3.1 Darstellung digitaler Aufnahmen 19 3.2 CAD-Systeme 22 3.3 Teleradiologie und Datenkompression 25 4\. Hardware: monochromatisches Röntgen 25 5\. Weiterführende Anwendungen 27 5.1 Tomosynthese 27 5.2 Kontrastmittelmammographie 29 6\. Diskussion 31 7\. Zusammenfassung 42 8\. Originalarbeiten 47 9\. Literaturverzeichnis 49, Trotz aller Fortschritte in der Brustkrebsdiagnostik in der Vergangenheit kann und muss die Mammographie weiter verbessert werden. Insbesondere die Einführung der digitalen Mammographie eröffnet diesbezüglich interessante Optionen. Mithilfe der Ergebnisse der vorliegenden Arbeit kann gezeigt werden, dass die höhere Kontrastauflösung der digitalen Mammographie insbesondere bei der Visualisierung von Grenzbefunden (Mikrokalk in Vergrößerungsaufnahmen) Vorteile gegenüber der konventionellen Mammographie bietet. So wurden mit den unterschiedlichen Modalitäten an Präparaten von 3 Untersuchern insgesamt 9705 Mikroverkalkungen ausgezählt. Dabei waren die Ergebnisse der digitalen Vollfeldmammographie (1020/753/881) denen der Film-Folienmammographie (901/643/822) deutlich überlegen [Originalarbeit 1]. Insgesamt konnte gezeigt werden, dass in der Praxis 6% mehr Verkalkungen visualisiert werden als in der herkömmlichen Mammographie. Dies führte jedoch in einer klinischen ROC-Studie nicht zu statistisch signifikanten Unterschieden (p=0,08958) in der Befundungsqualität, obwohl subjektiv in 10% der Entscheidungen die Bildqualität von den Untersuchern in den digitalen Aufnahmen als klinisch relevant besser eingeschätzt wurde [Originalarbeit 2]. Die verbesserte Bildqualität des digitalen Systems führt also in der Praxis zu keinen oder allenfalls geringen Verbesserungen in der Befundqualität. Da die Bildqualität bei den digitalen Systemen direkt mit der applizierten Strahlendosis korreliert, kann daher umgekehrt überlegt werden, inwiefern in der digitalen Mammographie ein Potenzial zur Dosisreduktion besteht. Dieses Potenzial zur Dosisreduktion kann bei Zusatzaufnahmen evaluiert werden. Eine seltene Zusatzaufnahme, die in unserem Patientinnenkollektiv bei über evaluierten 5000 Untersuchungen nur 7x angewendet wurde, ist die tangentiale Aufnahme zur Visualisierung von Hautverkalkungen. Dabei konnte gezeigt werden, dass hier eine Dosisreduktion der einzelnen Zusatzaufnahmen um 50% möglich ist [Originalarbeit3]. Über die dosisreduzierenden Spezialanwendungen hinaus konnte jedoch auch gezeigt werden, dass neue Möglichkeiten zur Dosisreduktion durch Veränderungen an der Hardware in der digitalen Mammographie bestehen. So konnte durch Einsparen des in der Mammographie normalerweise verwendeten Streustrahlenrasters prinzipiell eine durchschnittliche Dosisreduktion um mindestens 50% erreicht werden bei gleichbleibender Bildqualität. Die Möglichkeiten in der Routinediagnostik auf den Einsatz des Rasters zu verzichten wurden mithilfe einer Phantomstudie evaluiert. Dabei wurden von drei Untersuchern 976 Felder von Aufnahmen des CDMAM- Phantoms in 8 unterschiedlichen Dosiseinstellungen nicht erkannt, während 1115 Felder mit der herkömmlichen Rastertechnik nicht erkannt wurden. Die Vorteile durch die rasterlose Technik zeigten sich dabei insbesondere bei Kompressionsschichtdicken, Mammography is not a perfect tool for detectiAuch die übrigen Hardwarekomponenten wie z.B. das Raster ermöglichen durch den on of breast cancer. Despite this fact mammography is the first choice for reduction of breast cancer mortality and for workup of suspicious lesions. Without any doubt especially digital mammography has a potential for further improvements. We were able to show that due to the higher contrast resolution of digital detectors in routine mammography the diagnostic quality with these machines is equal or even improved compared to film screen mammography. This goal can be reached even with dose reduction what is used for spezial images and for localization procedures even nowadays. Additionally some components of the hardware have to be discussed in digital mammography and can be used for further dose reduction e.g. leaving away the grid. Also changes in the quality of the x-ray beam, e.g. with monochromatic x-rays, can lead to improvements in image quality with lower dose. Beside the hardware changes one has to think about the improvements due to software changes, too. This has lead to new algorithms for visualization of pathologic findings or CAD algorithms. Future applications like contrast medium mamography will lead to detections of otherwise occult tumors. All in all the improvements of digital mammography are promising tools for further improvements in breast cancer diagnostics and will hopefully lead to earlier detection of breast cancer. This would lead to a better prognosis of breast cancer.
- Published
- 2006
- Full Text
- View/download PDF
47. Challenging tumour immunological techniques that help to track cancer stem cells in malignant melanomas and other solid tumours.
- Author
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Kotlan B, Plotar V, Eles K, Horvath S, Balatoni T, Csuka O, Újhelyi M, Sávolt Á, Szollar A, Vamosi-Nagy I, Toth L, Farkas E, Toth J, Kasler M, and Liszkay G
- Abstract
Aim of the Study: The arsenal of questions and answers about the minor cancer initiating cancer stem cell (CSC) population put responsible for cancer invasiveness and metastases, has left with an unsolved puzzle. Specific aims of a complex project were partly focused on revealing new biomarkers of cancer. We designed and set up novel techniques to facilitate the detection of cancerous cells., Materials and Methods: As a novel approach, we investigated B cells infiltrating breast carcinomas and melanomas (TIL-B) in terms of their tumour antigen binding potential. By developing the TIL-B phage display technology we provide here a new technology for the specific detection of highly tumour-associated antigens. Single chain Fv (scFv) antibody fragment phage ELISA, immunofluorescence (IF) FACS analysis, chamber slide technique with IF confocal laser microscopy and immunohistochemistry (IHC) in paraffin-embedded tissue sections were set up and standardized., Results: We showed strong tumour-associated disialylated glycosphingolipid expression levels on various cancer cells using scFv antibody fragments, generated previously by uniquely invasive breast carcinoma TIL-B phage display library technology., Conclusions: We report herein a novel strategy to obtain antibody fragments of human origin that recognise tumour-associated ganglioside antigens. Our investigations have the power to detect privileged molecules in cancer progression, invasiveness, and metastases. The technical achievements of this study are being harnessed for early diagnostics and effective cancer therapeutics., Competing Interests: The authors declare no conflict of interest.
- Published
- 2018
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- View/download PDF
48. Development of DVB Satellite Systems into Meshed Networks
- Author
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Lutz, E.
- Subjects
Technical Developments ,Market Trends ,DVB-RCS - Published
- 2001
49. De Paris à Biarritz avec Germaine Krull et Claude Farrère : Un voyage phototextuel à l’ère du développement de l’automobile
- Author
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Anne-Céline Callens
- Subjects
photography ,publishing ,technical developments ,photographic avant-garde ,interwar period ,Literature (General) ,PN1-6790 - Abstract
At the beginning of the 20th century, many technological innovations transformed man’s relationship to space, distance and time. The automobile is becoming more accessible. It became a predilection subject for modernist photographers. In 1931, the éditions Jacques Haumont published La Route Paris-Biarritz, seen and photographed by Germain Krull, with a preface by Claude Farrère. This book presents the diversity of the area travelled. But it is also a revealing example of how the technique – photographic and traveling – determines the journey and its narrative.
- Full Text
- View/download PDF
50. Elektrische Fischsperren, technische Neuerungen
- Author
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Halsband, E.
- Subjects
inland waters ,Engineering ,fish barriers ,Fisheries ,electric barriers ,technical developments ,electric fishing - Abstract
Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
- Published
- 1970
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