Energy resolution of a photon-counting silicon strip detector

QC 20100714
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.

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

Lundqvist, MatsSectra Mamea AB, Smidesvägen 5, SE-171 41 Solna, Sweden (author)
Cederström, BjörnKTH,Medicinsk bildfysik,Medical Imaging(Swepub:kth)u1oerth9 (author)
Åslund, MagnusSectra Mamea AB, Smidesvägen 5, SE-171 41 Solna, Sweden (author)
Danielsson, MatsKTH,Medicinsk bildfysik,Medical Imaging(Swepub:kth)u1m3qe0f (author)
KTHMedicinsk bildfysik (creator_code:org_t)

In:Nuclear Instruments and Methods in Physics Research Section A: Elsevier BV, s. 156-1620168-90021872-9576

By the author/editor: Fredenberg, Erik ...; Lundqvist, Mats; Cederström, Björ ...; Åslund, Magnus; Danielsson, Mats

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Radiology Nuclea ...

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