We introduce a new approach for determining the contrast sensitivity function (CSF) in front of the anatomical noise of mammo-grams. This permits fundamental investigations on the influence of viewing conditions and image presentation parameters on the perception of contrast. A Gabor pattern and digits are used as target items. The approximation to contrast thresholds is done by a psychophysical staircase procedure and is performed for a selection of spatial frequencies. The results of an observer study with different mammographic cases show, that the approach is applicable independent of the chosen images. For conditions with a duration of at least 3 to 4 minutes the CSF can be determined for a set of spatial frequencies.
展开▼
