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Acceptable compression ratio of full-field digital mammography using JPEG 2000
1Department of Radiology, The Catholic University of Korea, Seoul, Republic of Korea.
Clinical Radiology
|April 1, 2011
Summary
A 60:1 lossy compression ratio using JPEG 2000 for full-field digital mammography (FFDM) images is visually identical to original images, making it acceptable for primary interpretation.
Area of Science:
- Radiology and Medical Imaging
- Image Compression Algorithms
- Digital Mammography
Background:
- Full-field digital mammography (FFDM) generates large image files.
- Efficient image compression is crucial for storage and transmission.
- Assessing the impact of compression on diagnostic quality is essential.
Purpose of the Study:
- To determine the acceptable lossy compression ratio for FFDM images using JPEG 2000.
- To evaluate the visual distinguishability of compressed FFDM images from original images.
Main Methods:
- Eighty FFDM cases (40 masses, 40 microcalcifications) were compressed using JPEG 2000 at ratios of 20:1, 40:1, 60:1, 80:1, and 100:1.
- Four radiologists independently assessed if compressed images were distinguishable from the original (control) group.
- Agreement among three or more reviewers on distinguishability was analyzed.
Main Results:
- At 60:1 compression, only 3/80 images were deemed distinguishable by three or more reviewers (p>0.05).
- Compression ratios of 80:1 and 100:1 resulted in statistically significant differences (p<0.05).
- The 60:1 ratio demonstrated no significant visual difference compared to the control group.
Conclusions:
- A lossy compression ratio of 60:1 for FFDM using JPEG 2000 is visually indistinguishable from original images.
- This 60:1 ratio is potentially acceptable for primary diagnostic interpretation in mammography.
- Further studies may explore the clinical impact of this compression level.
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