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Proceedings Paper

New light-amplifier-based detector designs for high spatial resolution and high sensitivity CBCT mammography and fluoroscopy
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Paper Abstract

New cone-beam computed tomographic (CBCT) mammography system designs are presented where the detectors provide high spatial resolution, high sensitivity, low noise, wide dynamic range, negligible lag and high frame rates similar to features required for high performance fluoroscopy detectors. The x-ray detectors consist of a phosphor coupled by a fiber-optic taper to either a high gain image light amplifier (LA) then CCD camera or to an electron multiplying CCD. When a square-array of such detectors is used, a field-of-view (FOV) to 20 x 20 cm can be obtained where the images have pixel-resolution of 100 μm or better. To achieve practical CBCT mammography scan-times, 30 fps may be acquired with quantum limited (noise free) performance below 0.2 μR detector exposure per frame. Because of the flexible voltage controlled gain of the LA's and EMCCDs, large detector dynamic range is also achievable. Features of such detector systems with arrays of either generation 2 (Gen 2) or 3 (Gen 3) LAs optically coupled to CCD cameras or arrays of EMCCDs coupled directly are compared. Quantum accounting analysis is done for a variety of such designs where either the lowest number of information carriers off the LA photo-cathode or electrons released in the EMCCDs per x-ray absorbed in the phosphor are large enough to imply no quantum sink for the design. These new LA- or EMCCD-based systems could lead to vastly improved CBCT mammography, ROI-CT, or fluoroscopy performance compared to systems using flat panels.

Paper Details

Date Published: 3 March 2006
PDF: 11 pages
Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61421R (3 March 2006); doi: 10.1117/12.649501
Show Author Affiliations
Stephen Rudin, SUNY, Univ. at Buffalo (United States)
Andrew T. Kuhls, SUNY, Univ. at Buffalo (United States)
Girijesh K. Yadava, SUNY, Univ. at Buffalo (United States)
Gaurav C. Josan, SUNY, Univ. at Buffalo (United States)
Ye Wu, SUNY, Univ. at Buffalo (United States)
Ravishankar N. Chityala, SUNY, Univ. at Buffalo (United States)
Hussain S. Rangwala, SUNY, Univ. at Buffalo (United States)
N. Ciprian Ionita, SUNY, Univ. at Buffalo (United States)
Kenneth R. Hoffmann, SUNY, Univ. at Buffalo (United States)
Daniel R. Bednarek, SUNY, Univ. at Buffalo (United States)

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

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