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Proceedings Paper

Image quality of digital radiography using flat detector technology
Author(s): Thierry Ducourant; David Couder; Thibaut Wirth; J. C. Trochet; Raoul J. M. Bastiaens; Tom J. C. Bruijns; Hans A. Luijendijk; Bernhard Sandkamp; Andrew G. Davies; Dominique Didier M.D.; Agustin Gonzalez; Sylvain Terraz; Daniel Ruefenacht
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Paper Abstract

One of the most demanding applications in dynamic X-Ray imaging is Digital Subtraction Angiography (DSA). As opposed to other applications such as Radiography or Fluoroscopy, there has been so far limited attempts to introduce DSA with flat detector (FD) technology: Up to now, only part of the very demanding requirements could be taken into account. In order to enable an introduction of FD technology also in this area, a complete understanding of all physical phenomena related to the use of this technology in DSA is necessary. This knowledge can be used for detector design and performance optimization. Areas of research include fast switching between several detector operating modes (e.g. switching between fluoroscopy and high dose exposure modes and vice versa) and non stability during the DSA run e.g. due to differences in gain between subsequent images. Furthermore, effects of local and global X-Ray overexposure (due to direct radiation), which can cause temporal artifacts such as ghosting, may have a negative impact on the image quality. Pixel shift operations and image subtraction enhance the visibility of any artifact. The use of a refresh light plays an important role in the optimization process. Both an 18x18 cm2 as well as a large area 30x40 cm2 flat panel detector are used for studying the various phenomena. Technical measurements were obtained using complex imaging sequences representing the most demanding application conditions. Studies on subtraction test objects were performed and vascular applications have been carried out in order to confirm earlier findings. The basis for comparison of DSA is, still, the existing and mature IITV technology. The results of this investigation show that the latest generation of dynamic flat detectors is capable of handling this kind of demanding application. Not only the risk areas and their solutions and points of attention will be addressed, but also the benefits of present FD technology with respect to state-of-the-art IITV technology regarding DSA will be discussed.

Paper Details

Date Published: 5 June 2003
PDF: 12 pages
Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); doi: 10.1117/12.479969
Show Author Affiliations
Thierry Ducourant, Trixell SAS (France)
David Couder, Trixell SAS (France)
Thibaut Wirth, Trixell SAS (France)
J. C. Trochet, Trixell SAS (France)
Raoul J. M. Bastiaens, Philips Medical Systems (Netherlands)
Tom J. C. Bruijns, Philips Medical Systems (Netherlands)
Hans A. Luijendijk, Philips Medical Systems (Netherlands)
Bernhard Sandkamp, Siemens AG (Germany)
Andrew G. Davies, Univ. of Leeds (United Kingdom)
Dominique Didier M.D., Geneva Univ. Hospital (Switzerland)
Agustin Gonzalez, Geneva Univ. Hospital (Switzerland)
Sylvain Terraz, Geneva Univ. Hospital (Switzerland)
Daniel Ruefenacht, Geneva Univ. Hospital (Switzerland)

Published in SPIE Proceedings Vol. 5030:
Medical Imaging 2003: Physics of Medical Imaging
Martin J. Yaffe; Larry E. Antonuk, Editor(s)

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