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Photon-counting CT with silicon detectors: feasibility for pediatric imaging
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.ORCID iD: 0000-0001-7253-0164
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.ORCID iD: 0000-0002-3039-9791
2009 (English)In: Medical Imaging 2009: Physics of Medical Imaging, 2009, Vol. 7258Conference paper, Published paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
2009. Vol. 7258
Series
Progress in Biomedical Optics and Imaging - Proceedings of SPIE, ISSN 1605-7422 ; 7258
Keyword [en]
Ct, Pediatrics, Photon counting, Silicon
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-86522DOI: 10.1117/12.813733Scopus ID: 2-s2.0-66749133539ISBN: 9780819475091 (print)OAI: oai:DiVA.org:kth-86522DiVA: diva2:500819
Conference
Medical Imaging 2009: Physics of Medical Imaging. Lake Buena Vista, FL. 9 February 2009 - 12 February 2009
Note

QC 20120214

Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2017-03-28Bibliographically approved

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