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Proceedings Paper

Contrast-to-noise of a non-ideal multi-bin photon counting x-ray detector
Author(s): J. Eric Tkaczyk; Vladimir Lobastov; Daniel D. Harrison; Adam S. Wang
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Paper 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.

Paper Details

Date Published: 17 March 2011
PDF: 10 pages
Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79613O (17 March 2011); doi: 10.1117/12.878290
Show Author Affiliations
J. Eric Tkaczyk, GE Global Research (United States)
Vladimir Lobastov, GE Global Research (United States)
Daniel D. Harrison, GE Global Research (United States)
Adam S. Wang, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 7961:
Medical Imaging 2011: Physics of Medical Imaging
Norbert J. Pelc; Ehsan Samei; Robert M. Nishikawa, Editor(s)

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