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Proceedings Paper

Combination of CT scanning and fluoroscopy imaging on a flat-panel CT scanner
Author(s): M. Grasruck; R. Gupta M.D.; B. Reichardt; Ch. Suess; B. Schmidt; K. Stierstorfer; S. Popescu; T. Brady M.D.; T. Flohr
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Paper Abstract

We developed and evaluated a prototype flat-panel detector based Volume CT (fpVCT) scanner. The fpVCT scanner consists of a Varian 4030CB a-Si flat-panel detector mounted in a multi slice CT-gantry (Siemens Medical Solutions). It provides a 25 cm field of view with 18 cm z-coverage at the isocenter. In addition to the standard tomographic scanning, fpVCT allows two new scan modes: (1) fluoroscopic imaging from any arbitrary rotation angle, and (2) continuous, time-resolved tomographic scanning of a dynamically changing viewing volume. Fluoroscopic imaging is feasible by modifying the standard CT gantry so that the imaging chain can be oriented along any user-selected rotation angle. Scanning with a stationary gantry, after it has been oriented, is equivalent to a conventional fluoroscopic examination. This scan mode enables combined use of high-resolution tomography and real-time fluoroscopy with a clinically usable field of view in the z direction. The second scan mode allows continuous observation of a timeevolving process such as perfusion. The gantry can be continuously rotated for up to 80 sec, with the rotation time ranging from 3 to 20 sec, to gather projection images of a dynamic process. The projection data, that provides a temporal log of the viewing volume, is then converted into multiple image stacks that capture the temporal evolution of a dynamic process. Studies using phantoms, ex vivo specimens, and live animals have confirmed that these new scanning modes are clinically usable and offer a unique view of the anatomy and physiology that heretofore has not been feasible using static CT scanning. At the current level of image quality and temporal resolution, several clinical applications such a dynamic angiography, tumor enhancement pattern and vascularity studies, organ perfusion, and interventional applications are in reach.

Paper Details

Date Published: 2 March 2006
PDF: 8 pages
Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61422J (2 March 2006); doi: 10.1117/12.653390
Show Author Affiliations
M. Grasruck, Siemens Medical Solutions (Germany)
R. Gupta M.D., Massachusetts General Hospital (United States)
B. Reichardt, Massachusetts General Hospital (United States)
Ch. Suess, Siemens Medical Solutions (Germany)
B. Schmidt, Siemens Medical Solutions (Germany)
K. Stierstorfer, Siemens Medical Solutions (Germany)
S. Popescu, Siemens Medical Solutions (Germany)
T. Brady M.D., Massachusetts General Hospital (United States)
T. Flohr, Siemens Medical Solutions (Germany)

Published in SPIE Proceedings Vol. 6142:
Medical Imaging 2006: Physics of Medical Imaging
Michael J. Flynn; Jiang Hsieh, Editor(s)

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