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

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.

Citation Download Citation

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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