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Proceedings Paper

X-ray image system design using a human visual model
Author(s): Warren B. Jackson; Peter Beebee; David A. Jared; David K. Biegelsen; James O. Larimer; Jeffrey Lubin; Jennifer Gille
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Paper Abstract

Because of the complex response of the human visual system, typical measurements of image system quality such as the detective quantum efficiency, mean transfer function, and signal-to- noise ratio cannot always be used to determine conditions for optimal perceptual image quality. Using a model of the human vision system, the ViDEOS/Sarnoff Human Vision Discrimination Model (HVM), this work demonstrates that human vision models provide a promising quantitative measure of image perceptual quality. The model requires an image and a matching reference image in order to determine the perceptual difference between the images at each point. A simple model of a digital amorphous silicon medical x-ray system is used to create the necessary images as a function of various design parameters. The image pairs are then analyzed by the HVM. In all cases the dependence of perceived image quality closely follows measures of image quality as determined by the HVM for many image system design variations. Increasing the detector size actually increases the image quality in the presence of either readout or input noise. The model was also used to optimize the image system for a specific task optimization. As an example, the effect of system design parameters on tumor identification in mammographic images is determined.

Paper Details

Date Published: 11 April 1996
PDF: 12 pages
Proc. SPIE 2708, Medical Imaging 1996: Physics of Medical Imaging, (11 April 1996); doi: 10.1117/12.237794
Show Author Affiliations
Warren B. Jackson, Xerox Palo Alto Research Ctr. (United States)
Peter Beebee, Xerox Palo Alto Research Ctr. (United States)
David A. Jared, Xerox Palo Alto Research Ctr. (United States)
David K. Biegelsen, Xerox Palo Alto Research Ctr. (United States)
James O. Larimer, NASA Ames Research Ctr. (United States)
Jeffrey Lubin, David Sarnoff Research Ctr. (United States)
Jennifer Gille, Western Aerospace Labs. (United States)

Published in SPIE Proceedings Vol. 2708:
Medical Imaging 1996: Physics of Medical Imaging
Richard L. Van Metter; Jacob Beutel, Editor(s)

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