E-ISSN 1305-3612
General Radiology - Original Article
The impact of irreversible image data compression on post-processing algorithms in computed tomography
1 Department of Radiology, University Hospital Cologne, Cologne, Germany;Department of Diagnostic and Interventional Radiology, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany  
2 Department of Diagnostic and Interventional Radiology, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany;Department of Internal Medicine, St. Hildegardis Hospital, Cologne, Germany  
Diagn Interv Radiol ; : -

Abstract

PURPOSE: To evaluate the influence of irreversible image compression at varying levels on image post-processing algorithms (3D volume rendering of angiographs, computer assisted detection of lung nodules, segmentation and volumetry of liver lesions, and automated evaluation of functional cardiac imaging) in computed tomography.

 

METHODS: Uncompressed CT image data (30 angiographs of the lower limbs, 38 lung exams, 20 liver exams and 30 cardiac exams) were anonymized and subsequently compressed using the JPEG2000 algorithm with compression ratios of 8:1, 10:1, and 15:1. Volume renderings of CT-angiographies obtained from compressed and uncompressed data were compared using objective and subjective measures. Computer assisted detection of lung nodules was performed on compressed and uncompressed image data and compared with respect to diagnostic performance. Segmentation and volumetry of liver lesions as well as measurement of ejection fraction on cardiac studies was performed on compressed and uncompressed datasets; differences in measurements were analyzed.

 

RESULTS: No differences could be detected for the 3D volume renderings and no statistically significant differences in performance were found for the computer assisted detection algorithm. Measurements in volumetry of liver lesions and functional cardiac imaging showed good to excellent reliability.

 

CONCLUSION: Irreversible image compression within the limits proposed by the European Society of Radiology has no significant influence on commonly used image post-processing algorithms in computed tomography.

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