Contrast-to-noise of a non-ideal multi-bin photon counting x-ray detector

J. Eric Tkaczyk; Vladimir Lobastov; Daniel D. Harrison; Adam S. Wang

doi:10.1117/12.878290

17 March 2011 Contrast-to-noise of a non-ideal multi-bin photon counting x-ray detector

J. Eric Tkaczyk, Vladimir Lobastov, Daniel D. Harrison, Adam S. Wang

Proceedings Volume 7961, Medical Imaging 2011: Physics of Medical Imaging; 79613O (2011) https://doi.org/10.1117/12.878290
Event: SPIE Medical Imaging, 2011, Lake Buena Vista (Orlando), Florida, United States

Abstract

The contrast-to-noise (CNR) is optimized over the weights and energy threshold settings of energy bins in a photon counting detector using "delta-pulse" model simulations. Comparison is made to single-bin photon counting and energy integration detectors. The CNR² for iodine imaging is about a factor of 2.5X higher for a perfect, photon counting detector compared to energy integration. Monte Carlo simulations are used to determine the impact of pile-up and other factors that degrade the spectral performance. The benefits of multi-bin photon counting vanish at about 40-60% tail fraction and 20-30 keV RMS noise. Because of pile-up, the CNR² benefit also decreases as the incident count rate approaches the maximum periodic rate (MPR). However the impact of pile-up is less for a three-bin detector than for a two-bin detector when the multiple bins are weighted optimally.

Citation Download Citation

J. Eric Tkaczyk, Vladimir Lobastov, Daniel D. Harrison, and Adam S. Wang "Contrast-to-noise of a non-ideal multi-bin photon counting x-ray detector", Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79613O (17 March 2011); https://doi.org/10.1117/12.878290

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