Abstract
The paper describes an experimental evaluation, by ROC analysis, of displayed CRT images after digitisation of analogue medical radiographs. Two types of images were used in these studies: (1) images of 2 mm diameter beads, and (2) images of 2 mm diameter cavities. The psychophysical experiment was carried out by obtaining ROC curves based on signal detection theory. Detectability was evaluated as the ‘area under the ROC curve’. It was found that the detectabilities of images on the CRT were significantly lower than those of the original images. As for the images of bead signals, the ‘areas under the ROC curve’ were 0.91 and 0.70 for the original images and the digital images respectively. However, the ‘area under the ROC curve’ could be improved to 0.84 or 0.80 by a multi-cycled display going through 2 or 4 cycles of contrast enhancement in the studies of bead images. The ‘area under the ROC curve’ of the cavity images was better than that of the beads.
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