Photon-counting spectral computed tomography using silicon strip detectors: a feasibility study
2010 (English)In: Physics in Medicine and Biology, ISSN 0031-9155, E-ISSN 1361-6560, Vol. 55, no 7, 1999-2022 p.Article in journal (Refereed) Published
We show how the spectral imaging framework should be modified to account for a high fraction of Compton interactions in low Z detector materials such as silicon. Using this framework, where deposited energies differ from actual photon energies, we compare the performance of a silicon strip detector, including the influence of scatter inside the detector and charge sharing but disregarding signal pileup, with an ideal energy integrating detector. We show that although the detection efficiency for silicon rapidly drops for the acceleration voltages encountered in clinical computed tomography practice, silicon detectors could perform on a par with ideal energy integrating detectors for routine imaging tasks. The use of spectrally sensitive detectors opens up the possibility for decomposition techniques such as k-edge imaging, and we show that the proposed modification of the spectral imaging framework is beneficial for such imaging tasks.
Place, publisher, year, edition, pages
2010. Vol. 55, no 7, 1999-2022 p.
fluorescence yields, energy, dependence
Radiology, Nuclear Medicine and Medical Imaging
IdentifiersURN: urn:nbn:se:kth:diva-19322DOI: 10.1088/0031-9155/55/7/014ISI: 000275756200014ScopusID: 2-s2.0-77949704874OAI: oai:DiVA.org:kth-19322DiVA: diva2:337369
QC 201101142010-08-052010-08-052011-01-14Bibliographically approved