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Proceedings Paper

An inverse geometry CT system with stationary source arrays
Author(s): Scott S. Hsieh; Joseph A Heanue; Tobias Funk; Waldo S Hinshaw; Norbert J. Pelc
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Paper Abstract

Traditional CT systems face a tradeoff between temporal resolution, volumetric coverage and cone beam artifacts and also have limited ability to customize the distribution of incident x-rays to the imaging task. Inverse geometry CT (IGCT) can overcome some of these limitations by placing a small detector opposite a large, rotating scanned source array. It is difficult to quickly rotate this source array to achieve rapid imaging, so we propose using stationary source arrays instead and investigate the feasibility of such a system. We anticipate that distinct source arrays will need to be physically separated, creating gaps in the sinogram. Symmetry can be used to fill the missing rays except those connecting gaps. With three source arrays, a large triangular field of view emerges. As the small detector orbits the patient, each source spot must be energized at multiple specifically designed times to ensure adequate sampling. A timing scheme is proposed that avoids timing clashes, efficiently uses the detector, and allows for simple collimation. The two-dimensional MTF, noise characteristics, and artifact levels are all found to be comparable to parallel-beam systems. A complete, 100 millisecond volumetric scan may be feasible.

Paper Details

Date Published: 16 March 2011
PDF: 7 pages
Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79611W (16 March 2011); doi: 10.1117/12.878801
Show Author Affiliations
Scott S. Hsieh, Stanford Univ. (United States)
Joseph A Heanue, Triple Ring Technologies, Inc. (United States)
Tobias Funk, Triple Ring Technologies, Inc. (United States)
Waldo S Hinshaw, Stanford Univ. (United States)
Triple Ring Technologies, Inc. (United States)
Norbert J. Pelc, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 7961:
Medical Imaging 2011: Physics of Medical Imaging
Norbert J. Pelc; Ehsan Samei; Robert M. Nishikawa, Editor(s)

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