Abstract
This paper studies the effects of training and experience on decision time and performance in mammography. We compared the performance of three groups of observers representing different levels of expertise: dedicated breast imagers (mammographers), radiology residents undergoing a mammography rotation, and mammography technologists, when reading a test set that contains benign and malignant lesions, as well as lesion free images. We show that the number of cases read significantly impacts performance, as measured by the area under the AFROC curve. We also show that different levels of expertise have different decision structures during the time course of image viewing. In fact we show that the mammographers should stop reading an image after 60 - 80 seconds, because at this point they have found all of the true targets present, and they are much more likely to make a mistake. On the other hand residents and technologists mistakes plague their performance throughout the time course of image viewing.
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