Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Gerhard Martens"'
Autor:
Habib Ur Rehman, Gerhard Martens, Ying Lai Tsai, Chawalit Chankhantha, Pinit Kidkhunthod, Andy H. Shen
Publikováno v:
Minerals, Vol 10, Iss 5, p 463 (2020)
Kunzite, the pink variety of spodumene is famous and desirable among gemstone lovers. Due to its tenebrescent properties, kunzite always remains a hot research candidate among physicists and mineralogists. The present work is continuing the effort to
Externí odkaz:
https://doaj.org/article/359b71d015854fc793b679b74dc1f208
Autor:
Ying Lai Tsai, Pinit Kidkhunthod, Habib Ur Rehman, Chawalit Chankhantha, Gerhard Martens, Andy H. Shen
Publikováno v:
Minerals, Vol 10, Iss 463, p 463 (2020)
Minerals
Volume 10
Issue 5
Minerals
Volume 10
Issue 5
Kunzite, the pink variety of spodumene is famous and desirable among gemstone lovers. Due to its tenebrescent properties, kunzite always remains a hot research candidate among physicists and mineralogists. The present work is continuing the effort to
Autor:
Norbert Kuhn, Stefan Löscher, Ewald Roessl, Thomas Koehler, Gerhard Martens, Udo Van Stevendaal, Heiner Daerr
Publikováno v:
Medical Physics. 42:1959-1965
Purpose: The purpose of this work is to investigate the feasibility of grating-based, differential phase-contrast, full-field digital mammography (FFDM) in terms of the requirements for field-of-view (FOV), mechanical stability, and scan time. Method
Autor:
Thomas Köhler, Marco Stampanoni, Ewald Roessl, Pablo Villanueva-Perez, Gerhard Martens, Carolina Arboleda Clavijo, Matthias Bartels, Zhentian Wang, Udo Van Stevendaal
Publikováno v:
Medical Imaging 2017: Physics of Medical Imaging.
Grating-based phase contrast mammography can help facilitate breast cancer diagnosis, as several research works have demonstrated. To translate this technique to the clinics, it has to be adapted to cover a large field of view within a limited exposu
Autor:
Gerhard Martens, Carolina Arboleda, Matthias Bartels, Ewald Roessl, Zhentian Wang, Udo Van Stevendaal, Thomas Koehler, Pablo Villanueva-Perez, Marco Stampanoni
Publikováno v:
Optics Express, 25 (6)
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 n
Autor:
Zahi A. Fayad, Klaus Jürgen Engel, Ewald Roessl, Roland Proksa, Gerhard Martens, Bernhard Brendel, David P. Cormode, Axel Thran
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 648:S259-S264
Todays state-of the art clinical computed tomography (CT) scannersexclusively use energy-integrating, scintillation detector technology, despite the fact that a part of the information carried by the transmitted x-ray photons is lost during the det
Autor:
Gereon Vogtmeier, Sebastian Schusser, Ewald Rössl, Klaus Engel, Dieter Geller, Gerhard Martens, Thomas Köhler
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 648:S202-S207
A quantitative theory for the contrast-to-noise ratio (CNR) in differential phase contrast imaging (DPCI) is proposed and compared to that of images derived from classical absorption contrast imaging (ACI). Most prominently, the CNR for DPCI contains
Autor:
Ewald Roessl, Rendon C. Nelson, Elmar M. Merkle, Neil A. Patil, Roland Proksa, Daniel T. Boll, Erik K. Paulson, Jens Peter Schlomka, Thorsten R. Fleiter, Sebastian T. Schindera, Gerhard Martens
Publikováno v:
Radiology. 254:270-276
To evaluate the capability of spectral computed tomography (CT) to improve the characterization of cystic high-attenuation lesions in a renal phantom and to test the hypothesis that spectral CT will improve the differentiation of cystic renal lesions
Autor:
Martin H. K. Hoffmann, Volker Rasche, Gerhard Martens, Ewald Roessl, Martin Jeltsch, Hans-Juergen Brambs, Roland Proksa, Sebastian Feuerlein, Jens-Peter Schlomka, Oliver Klass
Publikováno v:
Radiology. 249:1010-1016
The purpose of this study was to investigate whether spectral computed tomography (CT) has the potential to improve luminal depiction by differentiating among intravascular gadolinium-based contrast agent, calcified plaque, and stent material by usin
Autor:
Roland Proksa, Amir Livne, Jens-Peter Schlomka, S Dill, R Dorscheid, Ewald Roessl, Christian Bäumer, Gerhard Martens, Thomas Istel, Günter Zeitler, Christoph Herrmann, Roger Steadman
Publikováno v:
Physics in Medicine and Biology. 53:4031-4047
Theoretical considerations predicted the feasibility of K-edge x-ray computed tomography (CT) imaging using energy discriminating detectors with more than two energy bins. This technique enables material-specific imaging in CT, which in combination w