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Proceedings Paper

Influence of 8-bit versus 11-bit digital displays on observer performance and visual search: a multi-center evaluation
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Paper Abstract

Monochrome monitors typically display 8 bits of data (256 shades of gray) at one time. This study determined if monitors that can display a wider range of grayscale information (11-bit) can improve observer performance and decrease the use of window/level in detecting pulmonary nodules. Three sites participated using 8 and 11-bit displays from three manufacturers. At each site, six radiologists reviewed 100 DR chest images on both displays. There was no significant difference in ROC Az (F = 0.0374, p = 0.8491) as a function of 8 vs 11 bit-depth. Average Az across all observers with 8-bits was 0.8284 and with 11-bits was 0.8253. There was a significant difference in overall viewing time (F = 10.209, p = 0.0014) favoring the 11-bit displays. Window/level use did not differ significantly for the two types of displays. Eye position recording on a subset of images at one site showed that cumulative dwell times for each decision category were lower with the 11-bit than with the 8-bit display. T-tests for paired observations showed that the TP (t = 1.452, p = 0.1507), FN (t = 0.050, p = 0.9609) and FP (t = 0.042, p = 0.9676) were not statistically significant. The difference for the TN decisions was statistically significant (t = 1.926, p = 0.05). 8-bit displays will not impact negatively diagnostic accuracy, but using 11-bit displays may improve workflow efficiency.

Paper Details

Date Published: 8 March 2007
PDF: 5 pages
Proc. SPIE 6515, Medical Imaging 2007: Image Perception, Observer Performance, and Technology Assessment, 65150L (8 March 2007); doi: 10.1117/12.706293
Show Author Affiliations
Elizabeth A. Krupinski, Univ. of Arizona (United States)
Khan Siddiqui M.D., VA Maryland Health Care System (United States)
Eliot Siegel M.D., Univ. of Maryland/Baltimore (United States)
Rasu Shrestha, Univ. of Southern California (United States)
Edward Grant, Univ. of Southern California (United States)
Hans Roehrig, Univ. of Arizona (United States)
Jiahua Fan, Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 6515:
Medical Imaging 2007: Image Perception, Observer Performance, and Technology Assessment
Yulei Jiang; Berkman Sahiner, Editor(s)

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