Korean J Med Phys.  2008 Dec;19(4):298-304.

ROC Analysis of Simulated Chest Lesions for Computed Radiography and Digital Radiography at Various Tube Voltages

  • 1Department of Radiological Science, College of Health Science and Research Institute of Health Science, Yonsei University, Wonju, Korea. hjk1@yonsei.ac.kr


Current digital radiographic systems are rapidly growing in clinical applications. The purpose of this study was to evaluate the diagnostic performance of computed radiography (CR) and digital radiography (DR) at different tube voltages in the detection of simulated chest lesions. Patterns of simulated interstitial lung disease, incipient infiltration, and nodules were superimposed over an anthropomorphic chest phantom. A simulated chest phantom radiograph was obtained with CR and DR at different tube voltages (70 kV, 90 kV, and 120 kV). A total of 18,000 observations were analyzed using a receiver operating characteristic (ROC) analysis. The detection of all lesions showed higher Az values at 70 kV than 120 kV with CR. For the DR, mean Az values at 70 kV were higher than other tube voltages not all lesions but for micro-nodule interstitial lung disease, linear interstitial lung disease, and incipient infiltration. Based on these results, a clinical study should be performed to judge the use of suitable tube voltage according to the type of detector system and lesions.


ROC; CR; DR; Tube voltage; Simulated lesions

MeSH Terms

Lung Diseases, Interstitial
Radiographic Image Enhancement
ROC Curve
Full Text Links
  • KJMP
export Copy
  • Twitter
  • Facebook
Similar articles
Copyright © 2024 by Korean Association of Medical Journal Editors. All rights reserved.     E-mail: koreamed@kamje.or.kr