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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.