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Proceedings Paper

Observer performance using CRT monitors with different phosphors
Author(s): Hans Roehrig; Elizabeth A. Krupinski; Mahesh Sivarudrappa
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Paper Abstract

The goal of this study was to compare observer performance on two monitors -- one with a P45 and the other with a P104 phosphor. Phosphors have distinctly different physical properties that, among other things, affect the noise properties of the display. Differences in noise have an effect on the signal-to-noise ratio, and hence may have a significant affect on observer's detection performance. A complete physical analysis was done on the 2 monitors. A JND study was conducted to measure observer performance. A series of grating patterns was generated for display on the 2 monitors. Observers were instructed to report whether the pattern was vertical, horizontal or blank. Observer performance with the P45 was better than with the P104 phosphor. This result was supported by those found in the physical evaluation, that showed poorer results on various parameter. The results indicate that the type of phosphor does affect the physical aspects, which in turn affects observer performance. Two clinical areas in particular that might be affected by phosphor differences are nodule detection in chest images and mass detection in mammograms, since low contrast targets will be most affected by the noise differences (SNR) in different monitor phosphors.

Paper Details

Date Published: 24 May 1999
PDF: 8 pages
Proc. SPIE 3663, Medical Imaging 1999: Image Perception and Performance, (24 May 1999); doi: 10.1117/12.349645
Show Author Affiliations
Hans Roehrig, Health Sciences Ctr./Univ. of Arizona (United States)
Elizabeth A. Krupinski, Health Sciences Ctr./Univ. of Arizona (United States)
Mahesh Sivarudrappa, Health Sciences Ctr./Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 3663:
Medical Imaging 1999: Image Perception and Performance
Elizabeth A. Krupinski, Editor(s)

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