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Proceedings Paper

Characterization of a silicon strip detector for photon-counting spectral CT using monoenergetic photons from 40 keV to 120 keV
Author(s): Xuejin Liu; Hans Bornefalk; Han Chen; Mats Danielsson; Staffan Karlsson; Mats Persson; Cheng Xu; Ben Huber
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Paper Abstract

Background: We are developing a segmented silicon strip detector that operates in photon-counting mode and allows pulse-height discrimination with 8 adjustable energy bins. In this work, we determine the energy resolution of the detector using monoenergetic x-ray radiation from 40 keV to 120 keV. We further investigate the effects of pulse pileup and charge sharing between detector channels that may lead to a decreased energy resolution. Methods: For each incident monochromatic x-ray energy, we obtain count spectra at different photon fluxes. These spectra corresponds to the pulse-height response of the detector and allow the determination of energy resolution and charge-sharing probability. The energy resolution, however, is influenced by signal pileup and charge sharing. Both effects are quantified using Monte Carlo simulations of the detector that aim to reproduce the conditions during the measurements. Results: The absolute energy resolution is found to increase from 1.7 to 2.1 keV for increasing energies 40 keV to 120 keV at the lowest measured photon flux. The effect of charge sharing is found to increase the absolute energy resolution by a factor of 1.025 at maximum. This increase is considered as negligibly small. The pileup of pulses leads to a deterioration rate of the energy resolution of 4 · 10-3 keV Mcps-1 mm2, corresponding to an increase of 0.04keV per 10 Mcps increase of the detected count rate.

Paper Details

Date Published: 19 March 2014
PDF: 8 pages
Proc. SPIE 9033, Medical Imaging 2014: Physics of Medical Imaging, 90333O (19 March 2014); doi: 10.1117/12.2042862
Show Author Affiliations
Xuejin Liu, KTH Royal Institute of Technology (Sweden)
Hans Bornefalk, KTH Royal Institute of Technology (Sweden)
Han Chen, KTH Royal Institute of Technology (Sweden)
Mats Danielsson, KTH Royal Institute of Technology (Sweden)
Staffan Karlsson, KTH Royal Institute of Technology (Sweden)
Mats Persson, KTH Royal Institute of Technology (Sweden)
Cheng Xu, KTH Royal Institute of Technology (Sweden)
Ben Huber, KTH Royal Institute of Technology (Sweden)


Published in SPIE Proceedings Vol. 9033:
Medical Imaging 2014: Physics of Medical Imaging
Bruce R. Whiting; Christoph Hoeschen, Editor(s)

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