Photon-counting CT with silicon detectors: feasibility for pediatric imaging

Moa Yveborg; Cheng Xu; Erik Fredenberg; Mats Danielsson

doi:10.1117/12.813733

13 March 2009 Photon-counting CT with silicon detectors: feasibility for pediatric imaging

Moa Yveborg, Cheng Xu, Erik Fredenberg, Mats Danielsson

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 725825 (2009) https://doi.org/10.1117/12.813733
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

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.

Citation Download Citation

Moa Yveborg, Cheng Xu, Erik Fredenberg, and Mats Danielsson "Photon-counting CT with silicon detectors: feasibility for pediatric imaging", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 725825 (13 March 2009); https://doi.org/10.1117/12.813733

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