An Empirical Investigation Of Variability In Contrast-Detail Diagram Measurements

Leh-Nien D. Loo; Kunio Doi; Masamitsu Ishida; Charles E. Metz; Heang-Ping Chan; Yoshiharu Higashida; Yoshie Kodera

doi:10.1117/12.936007

13 December 1983 An Empirical Investigation Of Variability In Contrast-Detail Diagram Measurements

Leh-Nien D. Loo, Kunio Doi, Masamitsu Ishida, Charles E. Metz, Heang-Ping Chan, Yoshiharu Higashida, Yoshie Kodera

Proceedings Volume 0419, Application of Optical Instrumentation in Medicine XI; (1983) https://doi.org/10.1117/12.936007
Event: Application of Optical Instrumentation in Medicine XI, 1983, Atlanta, United States

Abstract

The contrast-detail (C-D) diagram has been used widely yin the evaluation of imaging systems including screen-film combinations, computed tomography, and digital radiography. Despite its apparent simplicity and efficiency in generating observer performance data, the relationship between this method and the more rigorous ROC or forced-choice procedures is not well understood. With a high-quality image processing/simulation system, we made images by superimposing digitally simulated square patterns on radiographic noise. We then studied the statistical variability in the C-D diagram due to within- and between-reader differences, and the effect of different numbers of image samples. Results indicate that the percent standard deviations due to each of these variations are about 10-20%. We also compared the visibility thresholds measured by the C-D diagram method and by an 18-alternative forced-choice (18AFC) procedure. Although the thresholds defined in these two methods are fundamentally different, we found that the threshold contrasts measured by the two procedures have similar values.

Citation Download Citation

Leh-Nien D. Loo, Kunio Doi, Masamitsu Ishida, Charles E. Metz, Heang-Ping Chan, Yoshiharu Higashida, and Yoshie Kodera "An Empirical Investigation Of Variability In Contrast-Detail Diagram Measurements", Proc. SPIE 0419, Application of Optical Instrumentation in Medicine XI, (13 December 1983); https://doi.org/10.1117/12.936007

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