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Differences in Compression Artifacts on Thin- and Thick-Section Lung CT Images

¹ All authors: Department of Radiology, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-707, Korea; and Seoul National University College of Medicine, Institute of Radiation Medicine, Seoul National University Medical Research, Seoul, Korea.

View larger version (12K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 1 —Scatterplot for peak signal-to-noise ratio. Data points represent thin (•) and thick () sections.

View larger version (18K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2A —Results of visual analyses. Graphs show results of visual analyses by readers 1 (A), 2 (B), and 3 (C). For each compression level, left and right bars indicate thin and thick sections, respectively. Each grade of perceptual artifacts is represented by different shade of gray (grade 0, white; grade 1, light gray; grade 2, dark gray; and grade 3, black).

View larger version (18K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2B —Results of visual analyses. Graphs show results of visual analyses by readers 1 (A), 2 (B), and 3 (C). For each compression level, left and right bars indicate thin and thick sections, respectively. Each grade of perceptual artifacts is represented by different shade of gray (grade 0, white; grade 1, light gray; grade 2, dark gray; and grade 3, black).

View larger version (17K): [in this window] [in a new window] [as a PowerPoint slide]   Fig. 2C —Results of visual analyses. Graphs show results of visual analyses by readers 1 (A), 2 (B), and 3 (C). For each compression level, left and right bars indicate thin and thick sections, respectively. Each grade of perceptual artifacts is represented by different shade of gray (grade 0, white; grade 1, light gray; grade 2, dark gray; and grade 3, black).

View larger version (110K): [in this window] [in a new window] [as a PowerPoint slide]   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.

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