论文信息 - Monte Carlo Modeling of the DQE of a-Se X-Ray Detectors for Breast Imaging

Monte Carlo Modeling of the DQE of a-Se X-Ray Detectors for Breast Imaging

We study the resolution characteristics of a-Se semiconductor x-ray detectors using ARTEMIS, a detailed Monte Carlo transport code that simulates the three-dimensional spatial and temporal transport of electron-hole pairs under an external electric field. The model takes into account generation and re-absorption of characteristic x rays, spreading due to Compton scattering and high-energy secondary electron transport, and drift and diffusion of electron-hole pairs under applied bias. The point responses for a 200 μm thick mammography detector for RQA radiation qualities are simulated using parallel processing. Line spread functions and modulation transfer functions show a dependence on incident x-ray energy and spatial frequency.

Yuan Fang | Aldo Badano | Karim S. Karim | Andreu Badal

[1] J. Sempau,et al. A PENELOPE-based system for the automated Monte Carlo simulation of clinacs and voxelized geometries-application to far-from-axis fields. , 2011, Medical physics.

[2] R. K. Swank. Absorption and noise in x‐ray phosphors , 1973 .

[3] A. Badano,et al. Effect of burst and recombination models for Monte Carlo transport of interacting carriers in a-Se x-ray detectors on Swank noise. , 2013, Medical physics.

[4] T. R. Fewell,et al. Molybdenum, rhodium, and tungsten anode spectral models using interpolating polynomials with application to mammography. , 1997, Medical physics.

[5] Aldo Badano,et al. Recombination models for spatio-temporal Monte Carlo transport of interacting carriers in semiconductors , 2011 .

[6] Larry Partain,et al. 50 μm pixel size a-Se mammography imager with high DQE and increased temperature resistance , 2010, Medical Imaging.

[7] I. Cunningham. Applied Linear-Systems Theory , 2000 .

[8] J. Sempau,et al. PENELOPE-2006: A Code System for Monte Carlo Simulation of Electron and Photon Transport , 2009 .

[9] Aldo Badano,et al. Spatiotemporal Monte Carlo transport methods in x-ray semiconductor detectors: application to pulse-height spectroscopy in a-Se. , 2011, Medical physics.