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Proceedings Paper

Detection Of Bars And Discs In Quantum Noise
Author(s): A. E. Burgess; K. Humphrey; R. F. Wagner
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Paper Abstract

We present preliminary results for threshold detection of sharp-edged and "fuzzy" bars and discs superimposed on noiseless and noisy backgrounds. The luminance profiles for the "fuzzy" targets were approximately gaussian. The background quantum noise is optical density fluctuation in nominally uniformly exposed radiographs. The measurements were done using the method of adjustment. Our results for sharp-edged targets agreed with previously published work. Our "fuzzy" target results are novel and demonstrate minima in the contrast-target size curve. The minima were near S to 10 milliradians diameter for discs and 2 to 4 milli-radians width for bars. The increasing threshold slope for large targets suggests a gradient detection process.

Paper Details

Date Published: 6 July 1979
PDF: 7 pages
Proc. SPIE 0173, Application of Optical Instrumentation in Medicine VII, (6 July 1979); doi: 10.1117/12.957121
Show Author Affiliations
A. E. Burgess, University of British Columbia (Canada)
K. Humphrey, University of British Columbia (Canada)
R. F. Wagner, Bureau of Radiological Health (United States)

Published in SPIE Proceedings Vol. 0173:
Application of Optical Instrumentation in Medicine VII
Joel E. Gray, Editor(s)

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