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Journal of Medical Imaging • new

Evaluation of models of spectral distortions in photon-counting detectors for computed tomography
Author(s): Jochen Cammin; Steffen G. Kappler; Thomas Weidinger; Katsuyuki Taguchi
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Paper Abstract

A semi-analytical model describing spectral distortions in photon-counting detectors (PCDs) for clinical computed tomography was evaluated using simulated data. The distortions were due to count rate-independent spectral response effects and count rate-dependent pulse-pileup effects and the model predicted both the mean count rates and the spectral shape. The model parameters were calculated using calibration data. The model was evaluated by comparing the predicted x-ray spectra to Monte Carlo simulations of a PCD at various count rates. The data-model agreement expressed as weighted coefficient of variation (COVW) was better than COVW=2.0% for dead time losses up to 28% and COVW=20% or smaller for dead time losses up to 69%. The accuracy of the model was also tested for the purpose of material decomposition by estimating material thicknesses from simulated projection data. The estimated attenuator thicknesses generally agreed with the true values within one standard deviation of the statistical uncertainty obtained from multiple noise realizations.

Paper Details

Date Published: 6 May 2016
PDF: 12 pages
J. Med. Img. 3(2) 023503 doi: 10.1117/1.JMI.3.2.023503
Published in: Journal of Medical Imaging Volume 3, Issue 2
Show Author Affiliations
Jochen Cammin, The Johns Hopkins Univ. School of Medicine (United States)
Steffen G. Kappler, Siemens Healthcare GmbH (Germany)
Thomas Weidinger, Siemens Healthcare GmbH (Germany)
Univ. zu Lübeck (Germany)
Katsuyuki Taguchi, The Johns Hopkins Univ. School of Medicine (United States)

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