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Start Over Topic computed tomography Publisher springer berlin heidelberg
2,089 results

2. Expert opinion paper on cardiac imaging after ischemic stroke

Author

Schnabel, Renate B., Camen, Stephan, Knebel, Fabian, Hagendorff, Andreas, Bavendiek, Udo, Böhm, Michael, Doehner, Wolfram, Endres, Matthias, Gröschel, Klaus, Goette, Andreas, Huttner, Hagen B., Jensen, Christoph, Kirchhof, Paulus, Korosoglou, Grigorios, Laufs, Ulrich, Liman, Jan, Morbach, Caroline, Nabavi, Darius Günther, Neumann-Haefelin, Tobias, Pfeilschifter, Waltraud, Poli, Sven, Rizos, Timolaos, Rolf, Andreas, Röther, Joachim, Schäbitz, Wolf Rüdiger, Steiner, Thorsten, Thomalla, Götz, Wachter, Rolf, and Haeusler, Karl Georg

Published
2021
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5. Abdominal Images Non-rigid Registration Using Local-Affine Diffeomorphic Demons

Author

Freiman, Moti, Voss, Stephan D., Warfield, Simon Keith, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Yoshida, Hiroyuki, editor, Sakas, Georgios, editor, and Linguraru, Marius George, editor

Published
2012
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6. Improving Diagnosis and Intervention: A Complete Approach for Registration of Liver CT Data

Author

Erdt, Marius, Oyarzun Laura, Cristina, Drechsler, Klaus, De Beni, Stefano, Solbiati, Luigi, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Yoshida, Hiroyuki, editor, Sakas, Georgios, editor, and Linguraru, Marius George, editor

Published
2012
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11. Numerical simulations of patient-specific models with multiple plaques in human peripheral artery: a fluid-structure interaction analysis

Author

Jiling Feng, Danyang Wang, and Ferdinand Serracino-Inglott

Subjects
Male, medicine.medical_specialty, Time Factors, Arterial disease, 0206 medical engineering, Hemodynamics, Blood Pressure, 02 engineering and technology, Femoral artery, 030204 cardiovascular system & hematology, 03 medical and health sciences, 0302 clinical medicine, Imaging, Three-Dimensional, medicine.artery, Internal medicine, Fluid–structure interaction, Fluid-structure interaction, medicine, Humans, Computer Simulation, Computed tomography, Aged, Gangrene, Multiple plaques, Original Paper, business.industry, Hyperelastic, Mechanical Engineering, Models, Cardiovascular, Numerical Analysis, Computer-Assisted, Blood flow, Patient specific, medicine.disease, 020601 biomedical engineering, Lipids, Plaque, Atherosclerotic, Femoral Artery, Lower Extremity, Regional Blood Flow, Modeling and Simulation, Cardiology, Patient-specific, Stress, Mechanical, business, Shear Strength, Tomography, X-Ray Computed, Biotechnology
Abstract

Atherosclerotic plaque in the femoral is the leading cause of peripheral artery disease (PAD), the worse consequence of which may lead to ulceration and gangrene of the feet. Numerical studies on fluid-structure interactions (FSI) of atherosclerotic femoral arteries enable quantitative analysis of biomechanical features in arteries. This study aims to investigate the hemodynamic performance and its interaction with femoral arterial wall based on the patient-specific model with multiple plaques (calcified and lipid plaques). Three types of models, calcification-only, lipid-only and calcification-lipid models, are established. Hyperelastic material coefficients of the human femoral arteries obtained from experimental studies are employed for all simulations. Oscillation of WSS is observed in the healthy downstream region in the lipid-only model. The pressure around the plaques in the two-plaque model is lower than that in the corresponding one-plaque models due to the reduction of blood flow domain, which consequently diminishes the loading forces on both plaques. Therefore, we found that stress acting on the plaques in the two-plaque model is lower than that in the corresponding one-plaque models. This finding implies that the lipid plaque, accompanied by the calcified plaque around, might reduce its risk of rupture due to the reduced the stress acting on it.

Published
2020

12. Differentiation of distal ureteral stones and pelvic phleboliths using a convolutional neural network

Author

Per Thunberg, Johan Jendeberg, and Mats Lidén

Subjects
Adult, Male, medicine.medical_specialty, Ureteral Calculi, Acute Renal Colic, Adolescent, Urology, 030232 urology & nephrology, Datasets as Topic, Convolutional neural network, 030218 nuclear medicine & medical imaging, Pelvis, Veins, Diagnosis, Differential, 03 medical and health sciences, Young Adult, 0302 clinical medicine, Phlebolith, medicine, Humans, Renal Colic, Vascular Calcification, Computed tomography, Aged, Retrospective Studies, Aged, 80 and over, Original Paper, business.industry, Deep learning, Middle Aged, medicine.disease, Image stack, Sagittal plane, medicine.anatomical_structure, Pelvic phleboliths, ROC Curve, Coronal plane, Convolutional neural networks, Female, Radiology, Neural Networks, Computer, Ureter, business, Tomography, X-Ray Computed, Pelvic phlebolith, Calcification
Abstract

The objectives were to develop and validate a Convolutional Neural Network (CNN) using local features for differentiating distal ureteral stones from pelvic phleboliths, compare the CNN method with a semi-quantitative method and with radiologists’ assessments and to evaluate whether the assessment of a calcification and its local surroundings is sufficient for discriminating ureteral stones from pelvic phleboliths in non-contrast-enhanced CT (NECT). We retrospectively included 341 consecutive patients with acute renal colic and a ureteral stone on NECT showing either a distal ureteral stone, a phlebolith or both. A 2.5-dimensional CNN (2.5D-CNN) model was used, where perpendicular axial, coronal and sagittal images through each calcification were used as input data for the CNN. The CNN was trained on 384 calcifications, and evaluated on an unseen dataset of 50 stones and 50 phleboliths. The CNN was compared to the assessment by seven radiologists who reviewed a local 5 × 5 × 5 cm image stack surrounding each calcification, and to a semi-quantitative method using cut-off values based on the attenuation and volume of the calcifications. The CNN differentiated stones and phleboliths with a sensitivity, specificity and accuracy of 94%, 90% and 92% and an AUC of 0.95. This was similar to a majority vote accuracy of 93% and significantly higher (p = 0.03) than the mean radiologist accuracy of 86%. The semi-quantitative method accuracy was 49%. In conclusion, the CNN differentiated ureteral stones from phleboliths with higher accuracy than the mean of seven radiologists’ assessments using local features. However, more than local features are needed to reach optimal discrimination.

Published
2020

22. European Society of Pediatric Radiology survey of perioperative imaging in pediatric liver transplantation: (3) postoperative imaging

Author

Dammann, Elena, Ording-Müller, Lil-Sofie, Franchi-Abella, Stéphanie, Verhagen, Martijn V., McGuirk, Simon P., Bokkers, Reinoud P.H., Clapuyt, Philippe R. M., Deganello, Annamaria, Tandoi, Francesco, de Ville de Goyet, Jean, Hebelka, Hanna, de Lange, Charlotte, Lozach, Cecile, Marra, Paolo, Mirza, Darius, Kaliciński, Piotr, Patsch, Janina M., Perucca, Giulia, Tsiflikas, Ilias, Renz, Diane M., Schweiger, Bernd, Spada, Marco, Toso, Seema, Viremouneix, Loïc, Woodley, Helen, Fischer, Lutz, Brinkert, Florian, Petit, Philippe, and Herrmann, Jochen

Published
2024
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23. European Society of Pediatric Radiology survey of perioperative imaging in pediatric liver transplantation: (2) intraoperative imaging

Author

Herrmann, Jochen, Petit, Philippe, Franchi-Abella, Stéphanie, Verhagen, Martijn V., McGuirk, Simon P., Dammann, Elena, Bokkers, Reinoud P. H., Clapuyt, Philippe R. M., Deganello, Annamaria, Tandoi, Francesco, de Ville de Goyet, Jean, Hebelka, Hanna, de Lange, Charlotte, Lozach, Cecile, Marra, Paolo, Mirza, Darius, Kaliciński, Piotr, Patsch, Janina M., Perucca, Giulia, Tsiflikas, Ilias, Renz, Diane M., Schweiger, Bernd, Spada, Marco, Toso, Seema, Viremouneix, Loïc, Woodley, Helen, Fischer, Lutz, Ording-Müller, Lil-Sofie, and Brinkert, Florian

Published
2024
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24. European Society of Pediatric Radiology survey of perioperative imaging in pediatric liver transplantation: (1) pre-transplant evaluation

Author

Herrmann, Jochen, Ording-Müller, Lil-Sofie, Franchi-Abella, Stéphanie, Verhagen, Martijn V., McGuirk, Simon P., Dammann, Elena, Bokkers, Reinoud P. H., Clapuyt, Philippe R. M., Deganello, Annamaria, Tandoi, Francesco, de Goyet, Jean de Ville, Hebelka, Hanna, de Lange, Charlotte, Lozach, Cecile, Marra, Paolo, Mirza, Darius, Kalicinski, Piotr, Patsch, Janina M., Perucca, Giulia, Tsiflikas, Ilias, Renz, Diane M., Schweiger, Bernd, Spada, Marco, Toso, Seema, Viremouneix, Loïc, Woodley, Helen, Fischer, Lutz, Petit, Philippe, and Brinkert, Florian

Published
2024
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25. Influencing factors for the increased stem version compared to the native femur in cementless total hip arthroplasty

Author

Mio Akiyama, Masanobu Ohishi, Taishi Sato, Masanobu Hirata, Yasuharu Nakashima, Takashi Itokawa, Yukihide Iwamoto, and Daisuke Hara

Subjects
musculoskeletal diseases, Adult, Male, medicine.medical_specialty, medicine.medical_treatment, Arthroplasty, Replacement, Hip, Computed tomography, Osteoarthritis, Prosthesis Design, Osteoarthritis, Hip, Arthritis, Rheumatoid, Femur Head Necrosis, medicine, Humans, Orthopedics and Sports Medicine, Femur, Femoral neck, Aged, Orthodontics, Hip surgery, Original Paper, medicine.diagnostic_test, business.industry, Femur Neck, Middle Aged, musculoskeletal system, medicine.disease, Arthroplasty, Surgery, medicine.anatomical_structure, Orthopedic surgery, Female, Hip Prosthesis, business, Tomography, X-Ray Computed, Total hip arthroplasty
Abstract

Stem version is not always equivalent to femoral neck version (native version) in cementless total hip arthroplasty (THA). We therefore examined the discrepancy of version between the native femoral neck and stem using pre- and postoperative computed tomography (CT), the level of the femur where the canal version most closely fit the stem version, and the factors influencing version discrepancy between the native femoral neck and stem.A total of 122 hips in 122 patients who underwent primary THA using a metaphyseal-fit stem through the postero-lateral approach were included. Pre- and postoperative CT images were utilized to measure native and stem version, and the version of the femoral canal at four levels relative to the lesser trochanter.The mean native and stem versions were 28.1 ± 11.0° and 38.0 ± 11.2°, respectively, revealing increased stem version with a mean difference of 9.8° (p0.0001). A total of 84 hips (68.9 %) revealed an increase in version greater than 5°. Femoral canal version at the level of the lesser trochanter most closely approximated that of stem version. Among the factors analysed, both univariate and multivariate analysis showed that greater degrees of native version and anterior stem tilt significantly reduced the version discrepancy between the native femoral neck and stem version.Since a cementless stem has little version adjustability in the femoral canal, these findings are useful for surgeons in preoperative planning and to achieve proper component placement in THA.

Published
2014