Comparison of Observer Performance Reading from a Video CRT vs. Reading from Film

Jw, Keyes; Rc, Kline; Ww, Resinger; Ea, Rose; Kf, Koral; Rogers, W.L.

doi:10.1097/00004424-198305000-00015

Cited by 2 publications

(1 citation statement)

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“…Here the maximum CRT luminance is 100 cd/m and the of the CRT is 2.3. The luminance difference HVS is calculated by the model given by Daly [22] in which the luminance difference discrimination threshold can be approximated by HVS (6) The Daly model corresponds to the luminance difference discrimination threshold for the sinusoidal lattice's luminance difference pattern and is one of the strictest of all discrimination threshold models [21], [23].…”

Section: Quantizationmentioning

confidence: 99%

Contrast mapping and evaluation for electronic X-ray images on CRT display monitor

Suzuki

Furukawa²,

Ono³

et al. 1997

IEEE Trans. Med. Imaging

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Simple chest X rays on film are the most common type of image in medical diagnosis. However, amongst the various types of medical X-ray images, they require the highest level of display quality due to the fact that the body structures they capture on film have varying degrees of permeability to X rays. Conventional high-definition digital display technology has not always been able to match the quality of such film images. This has been a major impediment against progress toward the complete digitization of simple chest X rays. The intent of this paper is to examine that, when applied to medical diagnosis of chest X rays, super-high-definition (SHD) images (digital images with resolution exceeding that of HDTV) are capable of producing a level of quality of diagnostic accuracy on a par with conventional film images. We will start out by seeking out the overall transmission characteristics of a system that uses digital radiography and a film digitizer to digitize images. We will then derive gray-scale transform characteristics based on the luminance linear method for approximating, as closely as possible on a CRT, film images on a light box that have wide dynamic range and high luminance. Finally, we will present the results of image evaluation experiments using high-definition CRT monitors. These results indicate that conventional film images and those on super-high-definition CRT monitors have nearly the same quality. They will also show that the contrast mapping selected by radiologists and theoretical luminance linear characteristics were almost the same except in low-luminance regions. We will also discuss radiologists' comments on CRT monitors after they participated in the evaluation experiment.

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