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

Ingrid S. Reiser; Robert M. Nishikawa; Beverly A. Lau

doi:10.1117/12.813808

13 March 2009 Effect of non-isotropic detector blur on microcalcification detectability in tomosynthesis

Ingrid S. Reiser, Robert M. Nishikawa, Beverly A. Lau

Author Affiliations +

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72585Z (2009) https://doi.org/10.1117/12.813808
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

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.

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Ingrid S. Reiser, Robert M. Nishikawa, and Beverly A. Lau "Effect of non-isotropic detector blur on microcalcification detectability in tomosynthesis", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72585Z (13 March 2009); https://doi.org/10.1117/12.813808

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