A Well Tempered Mammographic Display
Abstract
The objective was the development and testing of a simple softcopy display for digital mammography that was matched to human contrast sensitivity at ambient light levels. A calibration procedure was developed that derived a display function for the mammogram display based upon equalizing the just noticeable difference in contrast over the intensity range of the monitor at ambient illumination. The maximum and minimum pixel intensity determined for each breast image was used to set the range of the pixel driving value. The two procedures produce a perceptually tempered display. A single non-linear adjustment controls the displayed contrast. A rove-zoom feature that simultaneously coupled the location of features in the cranio-caudal and medio-lateral oblique views was developed. The time to detection and the detection accuracy using ROC analysis was compared for two radiologists reading mammograms using three display functions: (1) a function specifically set for each image that acted as an ideal performance standard, (2) standard linear contrast controls and (3) the perceptually tempered display. There was no difference in accuracy between the standard linear contrast controls and the perceptually tempered display. Both display functions were as accurate as the performance standard but they both incurred slightly more decision time.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1998
- Accession Number
- ADA358203
Entities
People
- Harold Kundel
Organizations
- University of Pennsylvania