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Fig. 3 —JPEG 2000 compression artifacts in unenhanced transverse lung CT images in 45-year-old man. Left and right columns are thin and thick sections, respectively. Compression artifacts are best shown if original images (top row) and 15:1 compressed images (middle row) are downloaded (see Fig. S3 in supplemental data online) and displayed alternately on the same monitor. Note that blurring artifacts due to compression are more apparent in thin sections than in thick sections, degrading texture of ground-glass opacity area (arrow), normal pulmonary parenchyma, and interlobar fissure (arrowheads). In compressed images, pixels outside lung were replaced with those from corresponding original images. Subtraction images (bottom row) represent mathematical differences between original and compressed images.