Abstract
We have evaluated the impact of the R2 Imagechecker, a CAD system for mammography in two studies using both radiologists and appropriately trained radiographers. We first compared the performance of 30 radiologists and 15 film-reading radiographers reading 120 normals and 60 cancer cases. The readers read all cases, with and without CAD prompts. The cancer cases included 40 screening-detected cancers and 20 interval cancers. We looked at sensitivity and specificity and found no significant difference between radiologists and film-reading radiographers with or without CAD. Our second study was designed to maximise the potential of CAD and included an additional 40 subtle cancers, previously missed by radiologists, but which R2 was able to prompt. We have carried out an evaluation of CAD involving a large number of film-readers and two test sets of cancers drawn from the UK screening programme. Our results suggest that the impact of prompts on readers' recall decisions is substantially lower than previous authors had anticipated.
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