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JPEG 2000 Compression of Abdominal CT: Difference in Tolerance Between Thin- and Thick-Section Images

Hyoun Sik Woo1,2, Kil Joong Kim1,2, Tae Jung Kim1,2, Seokyung Hahn3, Bohyoung Kim1,2, Young Hoon Kim1,2 and Kyoung Ho Lee1,2

1 Department of Radiology, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Gyeonggi-do, Seoul 463-707, Korea.
2 Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea.
3 Medical Research Collaborating Center, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.


Figure 1
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  		Fig. 1A —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. Thin-section CT images. According to pooled reviewers' responses, 6:1, 10:1, and 15:1 compressed images (second row) were distinguishable from originals (top row). Subtracted images (bottom row) represent mathematic differences between original and compressed images at each compression level.

 

Figure 2
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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.

 

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