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Energy resolution of a photon-counting silicon strip detector

Fredenberg, Erik, PhD, 1979- (author)
KTH,Medicinsk bildfysik,Medical Imaging
Lundqvist, Mats (author)
Sectra Mamea AB, Smidesvägen 5, SE-171 41 Solna, Sweden
Cederström, Björn (author)
KTH,Medicinsk bildfysik,Medical Imaging
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Åslund, Magnus (author)
Sectra Mamea AB, Smidesvägen 5, SE-171 41 Solna, Sweden
Danielsson, Mats (author)
KTH,Medicinsk bildfysik,Medical Imaging
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 (creator_code:org_t)
Elsevier BV, 2010
2010
English.
In: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; , s. 156-162
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • A photon-counting silicon strip detector with two energy thresholds was investigated for spectral X-ray imaging in a mammography system. Preliminary studies already indicate clinical benefit of the detector, and the purpose of the present study is optimization with respect to energy resolution. Factors relevant for the energy response were measured, simulated, or gathered from previous studies, and used as input parameters to a cascaded detector model. Threshold scans over several X-ray spectra were used to calibrate threshold levels to energy, and to validate the model. The energy resolution of the detector assembly was assessed to range over ΔE/E=0.12–0.26 in the mammography region. Electronic noise dominated the peak broadening, followed by charge sharing between adjacent detector strips, and a channel-to-channel threshold spread. The energy resolution may be improved substantially if these effects are reduced to a minimum. Anti-coincidence logic mitigated double counting from charge sharing, but erased the energy resolution of all detected events, and optimization of the logic is desirable. Pile-up was found to be of minor importance at typical mammography rates.

Subject headings

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)
MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)

Keyword

Spectral X-ray imaging
Mammography; Silicon strip detector
Photon counting
Energy resolution
Cascaded detector model
Electrical engineering, electronics and photonics
Elektroteknik, elektronik och fotonik
Medical engineering
Medicinsk teknik
Other engineering physics
Övrig teknisk fysik
Radiological research
Radiologisk forskning

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