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Proceedings Paper

Spatio-temporal Monte Carlo modeling of a-Se detectors for breast imaging: energy-weighted Swank noise and detective quantum efficiency
Author(s): Yuan Fang; Andreu Badal; Karim S. Karim; Aldo Badano
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Paper Abstract

We study the effect of energy weighting in Swank noise and Detective Quantum Efficiency (DQE) at zero spatial frequency with a detailed Monte Carlo (MC) transport code that includes the three-dimensional spatial and temporal transport of electron-hole pairs in semiconductor x-ray detectors. The transport model takes into account recombination and trapping of carriers including effects of Coulomb forces and external applied electric field. We report pulse-height spectra (PHS) for mono-energetic x rays from 6 to 28 keV photon energy with 0.5 keV step size, and for clinical mammography spectra. A first-approximation electronic noise model is included in the simulations. The Swank calculations take into account the entire PHS distribution while the DQE(0) is calculated from the simulated Swank factor, and quantum efficiency values from the PENELOPE database of attenuation coefficients. The simulated DQE(0) is based on the entire clinical x-ray spectrum and takes into account the energy distribution following Tapiovaara and Wagner's (Phys. Med. Biol. 30, 1985) description for the weighting of carrier transport processes. Swank and DQE simulations for semiconductor detectors can provide insight into the fundamental limitations and possible optimization of breast imaging systems.

Paper Details

Date Published: 9 March 2012
PDF: 6 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83135S (9 March 2012); doi: 10.1117/12.912012
Show Author Affiliations
Yuan Fang, U.S. Food and Drug Administration (United States)
Univ. of Waterloo (Canada)
Andreu Badal, U.S. Food and Drug Administration (United States)
Karim S. Karim, Univ. of Waterloo (Canada)
Aldo Badano, U.S. Food and Drug Administration (United States)

Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)

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