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KMID : 1103720100630040371
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Journal of the Korean Society of Radiology
2010 Volume.63 No. 4 p.371 ~ p.378
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Visually Lossless Threshold: JPEG 2000 compression of Digital Chest Radiographs
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Kim Gyoung-Min
Kim Kil-Joong
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Abstract
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Objectives: To estimate the visual lossless threshold of Joint Photographic Experts Group (JPEG) 2000 compression digital chest radiograph images.
Methods:Fifty (n=50) selected chest radiograph images were compressed to 5 different levels: reversible (as negative control) and irreversible 5:1, 10:1, 15:1, and 20:1. By alternately displaying the original image and its paired compressed image on the same monitor, five radiologists independently determined if the image pairs had detectable differences. For each reader, we compared the proportion of the image pairs (the compressed image and the original image) rated to have detectable differences between reversible compression and each of the four irreversible compressions using the exact test for paired proportions.
Results: For each reader, the proportion of the image pairs rated to have detectable difference was not significantly different between the reversible and irreversible 5:1 and 10:1 compressions. However, the proportion significantly increased with 15:1 and 20:1 irreversible compressions, versus reversible compression in all readers (p=7.4 x 10-22 -0.027).
Conclusions:10:1 compressed chest radiograph images can be considered visually lossless and are therefore potentially acceptable for primary interpretation.
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KEYWORD
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Data Compression, Radiology Information Systems, Radiography, Thoracic
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