title: Clinical evaluation of compression ratios using JPEG2000 on computed radiography chest images.
abstract: The efficient compression of radiographic images is of importance for improved storage and network utilization in support of picture archiving and communication systems (PACS) applications. The DICOM Working Group 4 adopted JPEG2000 as an additional compression standard in Supplement 61 over the existing JPEG. The wavelet-based JPEG2000 can achieve higher compression ratios with less distortion than the Discrete Cosine Transform (DCT)-based JPEG algorithm. However, the degradation of JPEG2000-compressed computed radiography (CR) chest images has not been tested comprehensively clinically. The authors evaluated the diagnostic quality of JPEG2000-compressed CR chest images with compression ratios from 5:1 to 200:1. An ROC (receiver operating characteristic analysis) and t test were performed to ascertain clinical performance using the JPEG2000-compressed images. The authors found that compression ratios as high as 20:1 can be utilized without affecting lesion detectability. Significant differences between the original and the compressed CR images were not recognized up to compression ratio of 50:1 within a confidence level of 99%.
authors.affiliation: BK21 Project for Medical Sciences, Yonsei University, Seoul, Korea.
authors.forename: Min-Mo
authors.initials: MM
authors.lastname: Sung
authors.forename: Hee-Joung
authors.initials: HJ
authors.lastname: Kim
authors.forename: Sun Kook
authors.initials: SK
authors.lastname: Yoo
authors.forename: Byoung-Wook
authors.initials: BW
authors.lastname: Choi
authors.forename: Ji-Eun
authors.initials: JE
authors.lastname: Nam
authors.forename: Hye-Sung
authors.initials: HS
authors.lastname: Kim
authors.forename: Jae-Hoon
authors.initials: JH
authors.lastname: Lee
authors.forename: Hyung-Sik
authors.initials: HS
authors.lastname: Yoo
mesh_terms: D000465:Algorithms; D006801:Humans; D007091:Image Processing, Computer-Assisted; D012372:ROC Curve; D013902:Radiography, Thoracic; D011873:Radiology Information Systems; D014057:Tomography, X-Ray Computed