Clinical Evaluation of the JPEG2000 Compression Rate of CT and MR Images for Long Term Archiving in PACS
Journal of the Korean Radiological Society
;
: 227-233, 2006.
Article
in Korean
| WPRIM
| ID: wpr-184017
ABSTRACT
PURPOSE:
We wanted to evaluate an acceptable compression rate of JPEG2000 for long term archiving of CT and MR images in PACS. MATERIALS ANDMETHODS:
Nine CT images and 9 MR images that had small or minimal lesions were randomly selected from the PACS at our institute. All the images are compressed with rates of 51, 101, 201, 401 and 801 by the JPEG2000 compression protocol. Pairs of original and compressed images were compared by 9 radiologists who were working independently. We designed a JPEG2000 viewing program for comparing two images on one monitor system for performing easy and quick evaluation. All the observers performed the comparison study twice on 5 mega pixel grey scale LCD monitors and 2 mega pixel color LCD monitors, rspectively. The PSNR (Peak Signal to Noise Ratio) values were calculated for making quantitative comparisons.RESULTS:
On MR and CT, all the images with 51 compression images showed no difference from the original images by all 9 observers and only one observer could detect a image difference on one CT image for 101 compression on only the 5 mega pixel monitor. For the 201 compression rate, clinically significant image deterioration was found in 50% of the images on the 5M pixel monitor study, and in 30% of the images on the 2M pixel monitor. PSNR values larger than 44 dB were calculated for all the compressed images.CONCLUSION:
The clinically acceptable image compression rate for long term archiving by the JPEG2000 compression protocol is 101 for MR and CT, and if this is applied to PACS, it would reduce the cost and responsibility of the system.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Data Compression
/
Noise
Type of study:
Practice guideline
Language:
Korean
Journal:
Journal of the Korean Radiological Society
Year:
2006
Type:
Article
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