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Fig. 1B —Joint Photographic Experts Group (JPEG) 2000 compression
artifacts in region of interest of contrast-enhanced CT images of transverse
abdomen in 49-year-old man. Thick-section CT images. Image compressed 6:1
(second row) was indistinguishable from original (top row),
whereas 10:1 and 15:1 compressed images (second row) were
distinguishable from originals. Note degradation of fine textures in abdominal
wall (dashed circle) and hepatic parenchyma (solid circle)
in compressed image. These artifacts are best shown if original and compressed
images are downloaded (see supplementary Figs. S1C-S1J at
www.ajronline.org)
and displayed alternately on same monitor. For original and compressed images,
window width is 400 H and widow level is 20 H.
