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Proceedings Paper

Three-dimensional columnar CsI model for x-ray imaging system simulations using MANTIS: validating for noise, blur, and light output
Author(s): Aldo Badano; Iacovos S. Kyprianou; Josep Sempau
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Paper Abstract

In previous work, we and others have focused the validation of detector models for computational simulations of imaging system performance on matching, to a small difference, specific aspects of the detector's performance, i.e., modulation transfer function or light output. In this work, instead, we selected three parameters that, together, represent a more complete description of the imaging properties of the phosphor screen to be modeled. The three performance parameters are the information or Swank factor determined from pulse-height spectra, the light output (either in absolute or relative scale), and the point-response function. Using this general methodology, we created screen models that exhibit good agreement with recent experimental measurements available in the literature, over a wide x-ray energy range (18-75 keV), and for front- and back-screen configurations. The models are being used in conjunction with MANTIS, a Monte Carlo code for simulating imaging systems that tracks x rays, electrons, and optical photons in the same geometric model, with x-ray and electron physics models from the PENELOPE package, and optical physics models from DETECT-II. This study allows us to incorporate realistic detector models into a detailed and complete Monte Carlo simulation of the entire imaging system, including the object and its absorbed dose map, and the properties of the imaging acquisition.

Paper Details

Date Published: 2 March 2006
PDF: 10 pages
Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61420W (2 March 2006); doi: 10.1117/12.653309
Show Author Affiliations
Aldo Badano, CDRH, U.S. Food and Drug Administration (United States)
Iacovos S. Kyprianou, CDRH, U.S. Food and Drug Administration (United States)
Josep Sempau, Univ. Politècnica de Catalunya (Spain)

Published in SPIE Proceedings Vol. 6142:
Medical Imaging 2006: Physics of Medical Imaging
Michael J. Flynn; Jiang Hsieh, Editor(s)

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