Journal of the Korean Society of Radiology (대한영상의학회지)

The Korean Society of Radiology (대한영상의학회)
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Visually Lossless Threshold: JPEG 2000 compression of Digital Chest Radiographs

JPEG 2000으로 압축한 디지털 흉부 X선 사진의 시각적 손실 없는 압축률

  • Kim, Gyoung-Min (Department of Radiology, Seoul National University College of Medicine, Seoul National University Hospital) ;
  • Kim, Kil-Joong (Department of Radiation Applied Life Science, Seoul National University College of Medicine)
  • 김경민 (서울대학교병원 영상의학과, 서울대학교 의과대학 영상의학교실) ;
  • 김길중 (서울대학교 의과대학 방사선응용생명과학 협동과정)
  • Received : 2010.04.30
  • Accepted : 2010.07.07
  • Published : 2010.10.01
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Abstract

Purpose: To estimate the visual lossless threshold of Joint Photographic Experts Group (JPEG) 2000 compression digital chest radiograph images. Materials and 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 ($p=7.4{\times}10^{-22}-0.027$). Conclusion: 10:1 compressed chest radiograph images can be considered visually lossless and are therefore potentially acceptable for primary interpretation.

목적: JPEG 2000으로 압축한 디지털 흉부 X선 사진의 시각적 손실 없는 압축률을 추정한다. 대상과 방법: 50장의 디지털 흉부 X선 사진을 선택하여 다섯 수준 (가역적(대조군), 비가역적 5:1, 10:1, 15:1, 20:1)으로 압축하였다. 동일한 모니터 상에 짝지워진 원본 영상과 압축 영상을 교대로 표시하여, 5명의 영상의학과 의사가 독립적으로 압축된 영상과 원본 영상 사이에 차이가 있는지를 결정하게 하였다. 각각의 판독자에서 가역적 압축 및 4 수준의 비가역적 압축에 대하여 원본 영상과 압축 영상 사이에 차이가 있다고 판정한 분율을 짝지워진 분율에 대한 정확 검정을 이용하여 비교하였다. 결과: 각 판독자에 대하여, 가역적 및 5:1, 10:1 압축 사이에서는 원본 영상과 압축 영상 사이에 차이가 있다고 판정한 분율에 통계적으로 유의한 차이가 없었다. 그러나 그 분율은 15:1 및 20:1 압축 영상에서 모든 판독자에 대하여 유의하게 증가하였다 (p=0.027 - p=$7.4{\times}10^{-22}$). 결론: 10:1로 압축된 흉부 X선 사진은 시각적으로 손실이 없는 것으로 간주할 수 있으며, 따라서 잠재적으로 일차 판독에 사용할 수 있을 것이다.

Keywords

Acknowledgement

Supported by : Seoul National University Bundang Hospital

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