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Proceedings Paper

Effect of non-isotropic detector blur on microcalcification detectability in tomosynthesis
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Paper Abstract

We have investigated the effect of non-isotropic blur in an indirect x-ray conversion screen in tomosynthesis imaging. To study this effect, we have implemented a screen model for angle-dependent x-ray incidence, and have validated the model using experimental as well as Monte-Carlo simulations reported in the literature. We investigated detector characteristics such as MTF, NPS and DQE, and we estimated system performance in a signal-known exactly detection task. We found that for such a screen, the frequency dependence of the MTF varies with x-ray source angle, while the frequency dependence of the NPS does not. Furthermore, as the x-ray source angle is increased, the DQE becomes more narrow and DQE(f=0) grows. We found that for a tomosynthesis scan angle of 90 degrees and a conversion screen thickness of 130 microns, detectability for small signals (radius=0.125 mm) was decreased by 13%, compared to signal radii above 0.5 mm. The magnitude of the degradation is expected to vary for different tomosynthesis configurations, such as scan angle and conversion screen thickness.

Paper Details

Date Published: 13 March 2009
PDF: 10 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72585Z (13 March 2009); doi: 10.1117/12.813808
Show Author Affiliations
Ingrid S. Reiser, The Univ. of Chicago (United States)
Robert M. Nishikawa, The Univ. of Chicago (United States)
Beverly A. Lau, The Univ. of Chicago (United States)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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