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Proceedings Paper

Photon-counting CT with silicon detectors: feasibility for pediatric imaging
Author(s): Moa Yveborg; Cheng Xu; Erik Fredenberg; Mats Danielsson
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Paper Abstract

X-ray detectors made of crystalline silicon have several advantages including low dark currents, fast charge collection and high energy resolution. For high-energy x-rays, however, silicon suffers from its low atomic number, which might result in low detection efficiency, as well as low energy and spatial resolution due to Compton scattering. We have used a monte-carlo model to investigate the feasibility of a detector for pediatric CT with 30 to 40 mm of silicon using x-ray spectra ranging from 80 to 140 kVp. A detection efficiency of 0.74 was found at 80 kVp, provided the noise threshold could be set low. Scattered photons were efficiently blocked by a thin metal shielding between the detector units, and Compton scattering in the detector could be well separated from photo absorption at 80 kVp. Hence, the detector is feasible at low acceleration voltages, which is also suitable for pediatric imaging. We conclude that silicon detectors may be an alternative to other designs for this special case.

Paper Details

Date Published: 13 March 2009
PDF: 6 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 725825 (13 March 2009); doi: 10.1117/12.813733
Show Author Affiliations
Moa Yveborg, Royal Institute of Technology (Sweden)
Cheng Xu, Royal Institute of Technology (Sweden)
Erik Fredenberg, Royal Institute of Technology (Sweden)
Mats Danielsson, Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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