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44 results on '"van Stevendaal, Udo"'

1. Towards clinical grating-interferometry mammography

Author

Arboleda, Carolina, Wang, Zhentian, Jefimovs, Konstantins, Koehler, Thomas, Van Stevendaal, Udo, Kuhn, Norbert, David, Bernd, Prevrhal, Sven, Lång, Kristina, Forte, Serafino, Kubik-Huch, Rahel Antonia, Leo, Cornelia, Singer, Gad, Marcon, Magda, Boss, Andreas, Roessl, Ewald, and Stampanoni, Marco

Published
2020
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2. A Simulation Study on Spectral Lesion Characterization

Author

Erhard, Klaus, van Stevendaal, Udo, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Tingberg, Anders, editor, Lång, Kristina, editor, and Timberg, Pontus, editor

Published
2016
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3. Dose-Saving Potential of Linear- and Non-Linear Energy Weighting in Photon-Counting Spectral Mammography

Author

van Stevendaal, Udo, Homann, Hanno, Roessl, Ewald, Erhard, Klaus, Cederström, Björn, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Kobsa, Alfred, editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Weikum, Gerhard, editor, Fujita, Hiroshi, editor, Hara, Takeshi, editor, and Muramatsu, Chisako, editor

Published
2014
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4. Correction to: Towards clinical grating-interferometry mammography

Author

Arboleda, Carolina, Wang, Zhentian, Jefimovs, Konstantins, Koehler, Thomas, Van Stevendaal, Udo, Kuhn, Norbert, David, Bernd, Prevrhal, Sven, Lång, Kristina, Forte, Serafino, Kubik-Huch, Rahel Antonia, Leo, Cornelia, Singer, Gad, Marcon, Magda, Boss, Andreas, Roessl, Ewald, and Stampanoni, Marco

Published
2020
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11. Towards clinical grating-interferometry mammography

Author

Arboleda, Carolina, primary, Wang, Zhentian, additional, Jefimovs, Konstantins, additional, Koehler, Thomas, additional, Van Stevendaal, Udo, additional, Kuhn, Norbert, additional, David, Bernd, additional, Prevrhal, Sven, additional, Lång, Kristina, additional, Forte, Serafino, additional, Kubik-Huch, Rahel Antonia, additional, Leo, Cornelia, additional, Singer, Gad, additional, Marcon, Magda, additional, Boss, Andreas, additional, Roessl, Ewald, additional, and Stampanoni, Marco, additional

Published
2019
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14. Reconstruction method incorporating the object-position dependence of visibility loss in dark-field imaging

Author

van Stevendaal, Udo, Wang, Zhentian, Köhler, Thomas, Martens, Gerhard, Stampanoni, Marco, Roessl, Ewald, University of Zurich, and van Stevendaal, Udo

Subjects
170 Ethics, 2502 Biomaterials, 2504 Electronic, Optical and Magnetic Materials, 2741 Radiology, Nuclear Medicine and Imaging, 610 Medicine & health, 10237 Institute of Biomedical Engineering, 3107 Atomic and Molecular Physics, and Optics
Published
2013
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15. Sensitivity-based optimization for the design of a grating interferometer for clinical X-ray phase contrast mammography

Author

Arboleda, Carolina, Wang, Zhentian, Koehler, Thomas, Martens, Gerhard, Van Stevendaal, Udo, Bartels, Matthias, Villanueva-Perez, Pablo, Roessl, Ewald, Stampanoni, Marco, Arboleda, Carolina, Wang, Zhentian, Koehler, Thomas, Martens, Gerhard, Van Stevendaal, Udo, Bartels, Matthias, Villanueva-Perez, Pablo, Roessl, Ewald, and Stampanoni, Marco

Abstract

An X-ray grating interferometer (GI) suitable for clinical mammography must comply with quite strict dose, scanning time and geometry limitations, while being able to detect tumors, microcalcifications and other abnormalities. Such a design task is not straightforward, since obtaining optimal phase-contrast and dark-field signals with clinically compatible doses and geometrical constraints is remarkably challenging. In this work, we present a wave propagation based optimization that uses the phase and dark-field sensitivities as figures of merit. This method was used to calculate the optimal interferometer designs for a commercial mammography setup. Its accuracy was validated by measuring the visibility of polycarbonate samples of different thicknesses on a Talbot-Lau interferometer installed on this device and considering some of the most common grating imperfections to be able to reproduce the experimental values. The optimization method outcomes indicate that small grating pitches are required to boost sensitivity in such a constrained setup and that there is a different optimal scenario for each signal type.

Published
2017

16. Image fusion algorithm for differential phase contrast imaging

Author

Roessl, Ewald, Koehler, Thomas, van Stevendaal, Udo, Martens, Gerhard, Hauser, Nik, Wang, Zhentian, Stampanoni, Marco, University of Zurich, and Roessl, Ewald

Subjects
170 Ethics, 2502 Biomaterials, 2504 Electronic, Optical and Magnetic Materials, 2741 Radiology, Nuclear Medicine and Imaging, 610 Medicine & health, 10237 Institute of Biomedical Engineering, 3107 Atomic and Molecular Physics, and Optics
Published
2012
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18. A Study on Mastectomy Samples to Evaluate Breast Imaging Quality and Potential Clinical Relevance of Differential Phase Contrast Mammography

Author

Hauser, Nik, Wang, Zhentian, Kubik-Huch, Rahel A, Trippel, Mafalda, Singer, Gad, Hohl, Michael K, Roessl, Ewald, Köhler, Thomas, van Stevendaal, Udo, Wieberneit, Nataly, Stampanoni, Marco, Hauser, Nik, Wang, Zhentian, Kubik-Huch, Rahel A, Trippel, Mafalda, Singer, Gad, Hohl, Michael K, Roessl, Ewald, Köhler, Thomas, van Stevendaal, Udo, Wieberneit, Nataly, and Stampanoni, Marco

Published
2014

20. A Study on Mastectomy Samples to Evaluate Breast Imaging Quality and Potential Clinical Relevance of Differential Phase Contrast Mammography

Author

Hauser, Nik, primary, Wang, Zhentian, additional, Kubik-Huch, Rahel A., additional, Trippel, Mafalda, additional, Singer, Gad, additional, Hohl, Michael K., additional, Roessl, Ewald, additional, Köhler, Thomas, additional, van Stevendaal, Udo, additional, Wieberneit, Nataly, additional, and Stampanoni, Marco, additional

Published
2014
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41. Towards clinical grating-interferometry mammography

Author

Arboleda, Carolina, Wang, Zhentian, Jefimovs, Konstantins, Koehler, Thomas, van Stevendaal, Udo, Kuhn, Norbert, David, Bernd, Prevrhal, Sven, Lång, Kristina, Forte, Serafino, Kubik-Huch, Rahel Antonia, Leo, Cornelia, Singer, Gad, Marcon, Magda, Boss, Andreas, Roessl, Ewald, and Stampanoni, Marco

Subjects
Interferometry, Phase contrast, 3. Good health, Mammography
Abstract

Objectives Grating-interferometry-based mammography (GIM) might facilitate breast cancer detection, as several research works have demonstrated in a pre-clinical setting, since it is able to provide attenuation, differential phase contrast, and scattering images simultaneously. In order to translate this technique to the clinics, it has to be adapted to cover a large field-of-view within a clinically acceptable exposure time and radiation dose. Methods We set up a grating interferometer that fits into a standard mammography system and fulfilled the aforementioned conditions. Here, we present the first mastectomy images acquired with this experimental device. Results and conclusion Our system performs at a mean glandular dose of 1.6 mGy for a 5-cm-thick, 18%-dense breast, and a field-of-view of 26 × 21 cm2. It seems to be well-suited as basis for a clinical-environment device. Further, dark-field signals seem to support an improved lesion visualization. Evidently, the effective impact of such indications must be evaluated and quantified within the context of a proper reader study. Key Points • Grating-interferometry-based mammography (GIM) might facilitate breast cancer detection, since it is sensitive to refraction and scattering and thus provides additional tissue information. • The most straightforward way to do grating-interferometry in the clinics is to modify a standard mammography device. • In a first approximation, the doses given with this technique seem to be similar to those of conventional mammography., European Radiology, 30, ISSN:0938-7994, ISSN:1432-1084

43. Clinical boundary conditions for grating-based differential phase-contrast mammography.

Author

Roessl E, Daerr H, Koehler T, Martens G, and van Stevendaal U

Subjects
Hot Temperature, Humans, Image Processing, Computer-Assisted, Interferometry, Mammography instrumentation, Mastectomy, Movement, Radiation Dosage, Radiographic Image Enhancement, Time Factors, Mammography methods
Abstract

Research in grating-based differential phase-contrast imaging (DPCI) has gained increasing momentum in the past couple of years. The first results on the potential clinical benefits of the technique for X-ray mammography are becoming available and indicate improvements in terms of general image quality, the delineation of lesions versus the background tissue and the visibility of microcalcifications. In this paper, we investigate some aspects related to the technical feasibility of DPCI for human X-ray mammography. After a short introduction to state-of-the-art full-field digital mammography in terms of technical aspects as well as clinical aspects, we put together boundary conditions for DPCI. We then discuss the implications for system design in a comparative manner for systems with two-dimensional detectors versus slit-scanning systems, stating advantages and disadvantages of the two designs. Finally, focusing on a slit-scanning system, we outline a possible concept for phase acquisition.

Published
2014
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44. Accelerating image acquisition in 64-MDCT: the influence of scan parameters on image resolution and quality in a phantom study.

Author

Klink T, Regier M, van Stevendaal U, Grass M, Adam G, and Begemann P

Subjects
Acceleration, Artifacts, Humans, Multidetector Computed Tomography methods, Quality Control, Radiation Dosage, Sensitivity and Specificity, Phantoms, Imaging, Radiographic Image Interpretation, Computer-Assisted methods, Tomography, Spiral Computed methods
Abstract

Computed tomographic (CT) image resolution and quality were evaluated utilizing varying scan protocols with accelerated image acquisition. A resolution phantom with hole diameters from 0.2 to 1.0 mm was scanned in axial, coronal, and sagittal plane using a 64-slice multidetector CT with varying scan parameters. No relevant differences in image resolution and quality were detected between the fastest scan protocol, with the shortest rotation time and highest pitch, and the slowest protocol. Accelerated CT protocols resulted in diagnostic images with adequate resolution and quality., (Copyright © 2012 Elsevier Inc. All rights reserved.)

Published
2012
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