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Proceedings Paper

Effect of shift invariance and stationarity assumptions on simple detection tasks: spatial and spatial frequency domains
Author(s): Robert M. Gagne; Kyle J. Myers; Philip W. Quinn
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Paper Abstract

A lens-coupled digital radiography system was used to investigate the impact of shift invariance and stationarity assumptions on task-based measures of performance. Experimental data are available on the imaging system's large area gray-scale transfer (sensitivity), resolution (modulation transfer function) and noise (variance map, autocovariance function, and noise power spectrum) properties in different regions of the field of view. These data were obtained for two different values of optical demagnification factor and three levels of x-ray exposure. Evidence of shift variant and non-stationary behavior is seen in the position dependence of the sensitivity, resolution and noise properties of the imaging system. Estimates of observer performance in terms of signal-to- noise-ratio were obtained from one algorithmic observer (DC- suppressed matched filter) and from one analytic observer (pre-whitening matched filter) for the task of detecting a known object (CDMAM phantom) on a flat background. For the special case of a large object at the center of the field- of-view, estimates of observer performance were essentially the same whether based on spatial or spatial frequency domain measures.

Paper Details

Date Published: 28 June 2001
PDF: 8 pages
Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); doi: 10.1117/12.430938
Show Author Affiliations
Robert M. Gagne, FDA Ctr. for Devices and Radiological Health (United States)
Kyle J. Myers, FDA Ctr. for Devices and Radiological Health (United States)
Philip W. Quinn, FDA Ctr. for Devices and Radiological Health (United States)


Published in SPIE Proceedings Vol. 4320:
Medical Imaging 2001: Physics of Medical Imaging
Larry E. Antonuk; Martin Joel Yaffe, Editor(s)

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