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Proceedings Paper

Multidetector-row CT with a 64–row amorphous silicon flat panel detector
Author(s): Edward G. Shapiro; Richard E. Colbeth; Earl T. Daley; Isaias D. Job; Ivan P. Mollov; Todor I. Mollov; John M. Pavkovich; Pieter G. Roos; Josh M. Star-Lack; Carlo A. Tognina
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Paper Abstract

A unique 64-row flat panel (FP) detector has been developed for sub-second multidetector-row CT (MDCT). The intent was to explore the image quality achievable with relatively inexpensive amorphous silicon (a-Si) compared to existing diagnostic scanners with discrete crystalline diode detectors. The FP MDCT system is a bench-top design that consists of three FP modules. Each module uses a 30 cm x 3.3 cm a-Si array with 576 x 64 photodiodes. The photodiodes are 0.52 mm x 0.52 mm, which allows for about twice the spatial resolution of most commercial MDCT scanners. The modules are arranged in an overlapping geometry, which is sufficient to provide a full-fan 48 cm diameter scan. Scans were obtained with various detachable scintillators, e.g. ceramic Gd2O2S, particle-in-binder Gd2O2S:Tb and columnar CsI:Tl. Scan quality was evaluated with a Catphan-500 performance phantom and anthropomorphic phantoms. The FP MDCT scans demonstrate nearly equivalent performance scans to a commercial 16-slice MDCT scanner at comparable 10 - 20 mGy/100mAs doses. Thus far, a high contrast resolution of 15 lp/cm and a low contrast resolution of 5 mm @ 0.3 % have been achieved on 1 second scans. Sub-second scans have been achieved with partial rotations. Since the future direction of MDCT appears to be in acquiring single organ coverage per scan, future efforts are planned for increasing the number of detector rows beyond the current 64- rows.

Paper Details

Date Published: 15 March 2007
PDF: 13 pages
Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65103X (15 March 2007); doi: 10.1117/12.713682
Show Author Affiliations
Edward G. Shapiro, Varian Medical Systems (United States)
Richard E. Colbeth, Varian Medical Systems (United States)
Earl T. Daley, Varian Medical Systems (United States)
Isaias D. Job, Varian Medical Systems (United States)
Ivan P. Mollov, Varian Medical Systems (United States)
Todor I. Mollov, Varian Medical Systems (United States)
John M. Pavkovich, Varian Medical Systems (United States)
Pieter G. Roos, Varian Medical Systems (United States)
Josh M. Star-Lack, Varian Medical Systems (United States)
Carlo A. Tognina, Varian Medical Systems (United States)

Published in SPIE Proceedings Vol. 6510:
Medical Imaging 2007: Physics of Medical Imaging
Jiang Hsieh; Michael J. Flynn, Editor(s)

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