Even low-ratio compression changes what readers see

July 1, 2008 Diagnostic Imaging. Even low-ratio compression changes what readers see John C. Hayes -------------------------------------------------------------------------------- Changes in images introduced by compression algorithms at levels as low as 8:1 can be observed by readers when they are compared with uncompressed images, according to a research report presented at the SIIM conference. Researchers were unable to say what impact compression has on diagnosis, however, as the study did not address this question. The study included nearly 15,000 images at three institutions. Readers were asked to flip between compressed and uncompressed images and to say whether they noticed any difference in the two groups. The readers found differences between 8:1 compressed and uncompressed images 78% of the time. The figures for 12:1 compression were 95% and for 16:1 compression, 99%.

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