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Characterization of Luminance Probe for Accurate Contrast Measurements in Medical Displays



Edward F. Kelley, Aldo Badano


Quantifying the luminance range in a medical x-ray and the electronic displays for use in radiology is difficult because of the extremely high contrasts involved. Methods are presented here that permit the evaluation of the performance of a detector probe used in attempt to accurately measure these high contrast images. The contamination of the measured displayed luminance arising from the reflections back off the detector apparatus are measured and compared with the internal veiling-glare corruption that occurs from scattering within the detector probe. The veiling-glare from scattering is seen to be the major contribution to errors in luminance measurements using a simple detector within the probe. Suggestions for improvements are presented for future work.
NIST Interagency/Internal Report (NISTIR) - 6974
Report Number


probe, radiological display, stray-light elimination tube (SLET), flat panel display, FPD, medical display, narrow frustum SLET


Kelley, E. and Badano, A. (2003), Characterization of Luminance Probe for Accurate Contrast Measurements in Medical Displays, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed April 19, 2024)
Created March 30, 2003, Updated October 12, 2021