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[Application study of JPEG2000 image compression in nuclear medicine].
Luyi Zhou1, Xianyu Su, Weishi Qin
1Department of Nuclear Medicine, West China Hospital, Sichuan University, Chengdu, China.
Summary
JPEG2000 compression for nuclear medicine (NM) images shows limited benefit with lossless methods due to low compression ratios. Lossy compression effectively preserves diagnostic quality for static NM images at ratios up to 10:1.
Area of Science:
- Medical Imaging
- Image Compression
- Nuclear Medicine
Background:
- Nuclear medicine (NM) imaging generates crucial diagnostic data.
- Efficient image compression is vital for storage and transmission.
- JPEG2000 is a modern compression standard with potential for medical applications.
Purpose of the Study:
- To evaluate the efficacy of JPEG2000 compression for nuclear medicine images.
- To determine the impact of both lossless and lossy compression on diagnostic image quality.
- To establish optimal compression ratios for NM image archiving.
Main Methods:
- Static NM images (normal and abnormal) were compressed using JPEG2000.
- Lossless compression ratios (CR) were calculated.
- Lossy compression was assessed by NM physicians using ROC analysis and AUC calculation.
- Paired t-tests compared AUC values of original and compressed images.
Main Results:
- Lossless JPEG2000 compression yielded a low CR of 1.34:1.
- For lossy compression, Area Under the Curve (AUC) decreased as CR increased.
- No significant diagnostic quality difference was found at 10:1 CR, but differences emerged at higher ratios.
Conclusions:
- Lossless JPEG2000 offers minimal utility for NM images due to poor compression ratios.
- Lossy JPEG2000 preserves diagnostic quality for static NM images at CRs from 10:1 to 50:1.
- Compression parameters should be adapted based on NM image characteristics, particularly noise levels.