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Proceedings Paper

Model observer and human observer performance studies in differential phase contrast CT
Author(s): Ke Li; Nicholas Bevins; Joseph Zambelli; Guang-Hong Chen
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Paper Abstract

This study investigates the possibility of using the model observer detectability to represent human detection performance in differential phase contrast CT (DPC-CT). Five model observers were investigated, including the prewhitening (PW) observer, the prewhitening observer with eye filter and internal noise (PWEi), the nonprewhitening (NPW) observer, the non-prewhitening observer with eye filter (NPWE), and the channelized Hotelling observer (CHO). Human 2AFC experiments involving four physicist observers were also performed to provide reference to the model observer results. The contrast thresholds required for 92% correct decision rate in 2AFC tests were evaluated for each observer. While all five model observers show good correlations with human observers, the CHO generated the best quantitative agreement with human observer results. Compared with the time-consuming human observer method, the model observer method is of much higher efficiency for the evaluation and optimization of DPC-CT.

Paper Details

Date Published: 19 March 2013
PDF: 7 pages
Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 866817 (19 March 2013); doi: 10.1117/12.2008102
Show Author Affiliations
Ke Li, Univ. of Wisconsin-Madison (United States)
Nicholas Bevins, Univ. of Wisconsin-Madison (United States)
Joseph Zambelli, Univ. of Wisconsin-Madison (United States)
Guang-Hong Chen, Univ. of Wisconsin-Madison (United States)

Published in SPIE Proceedings Vol. 8668:
Medical Imaging 2013: Physics of Medical Imaging
Robert M. Nishikawa; Bruce R. Whiting; Christoph Hoeschen, Editor(s)

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