The influence of a perceptually linearized display on observer performance and visual search.
OBJECTIVE
The purpose of this study was to determine whether perceptual linearization of the tone scale affects the detection and visual search behaviors of radiologists searching mammograms for masses and microcalcifications. A perceptually linearized display is designed to match the capabilities of the human visual system more closely than a nonlinearized display.


METHODS
Six radiologists viewed 50 pairs of mammograms, once on a perceptually linearized cathode-ray tube (CRT) monitor and once on a non-linearized CRT monitor. Eye position also was recorded as the observers searched the images for masses and microcalcifications.


RESULTS
Observer performance was significantly (P = .003) better with the perceptually linearized display. Dwell times associated with true-negative decisions were significantly longer with use of the nonlinearized display. The number of fixation clusters generated during search was also greater with use of the nonlinearized display for the lesion-free images.


CONCLUSIONS
A perceptually linearized display yields better detection performance and a more efficient visual search. Perceptually linearized displays should be used for reading radiographs displayed on CRT monitors.
Krupinski
E A
EA
Department of Radiology, University of Arizona, Tucson 85724, USA.
Roehrig
H
H
D001943:Breast Neoplasms / Q000000981:diagnostic imaging; D002114:Calcinosis / Q000000981:diagnostic imaging; D003626:Data Display; D005260:Female; D006801:Humans; D008327:Mammography / Q000706:statistics & numerical data; D015588:Observer Variation; D012372:ROC Curve; D011856:Radiographic Image Enhancement; D014796:Visual Perception