Abstract

This study investigates the just-noticeable difference (JND) in luminance below the ${0.050}\;{{\rm cd/m}^2}$ threshold not covered by the DICOM standard in medical imaging displays. A total of 21 healthy young adults were tested using an ultralow-luminance liquid crystal display at a viewing distance of 46 cm. The optotype featured a 4 cycle/deg rectangular wave-like stripe. The average percentage of correct responses for JND indices between ${-}{18}$ and 0 was 70.8%. Using the extended JND based on the Barten model that matches the current JND definition, we confirmed the JND at a very low luminance of ${0.0500}\;{{\rm cd/m}^2}$ or less. These findings suggest the feasibility of further refining the gradation differences in medical imaging displays.

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