Defining picture quality entails a number of metrics. These varieties of terms created prior to the creation of the incandescent light to the contemporary definitions located in DICOM Component, Grayscale Standard Display Function, or GSDF. A few of the terms still in operation were developed for analog TV. Their use in application to Liquid Crystal Displays or LCDs can bring about some errors in understanding. As the Cathode Ray Tube or CRT has, for the most part, left as a clinical imaging display platform, the following explanations are concentrated on LCD technology.

  • Luminosity

Luminosity is the right term for photon energy that gets to the eye; it is not Illumination, as many assume. The system of action for luminous intensity is the candela. One candela, which suggests candle in Latin, is roughly the luminescent intensity of one typical candlelight. The recommended system of measure is revealed as candelas per square meter or cd/m2.

  • Brightness/contrast

The contrast on a display screen is the range of luminosity available from an “off” pixel to a “100% on” pixel; the off pixel does not mean a total lack of luminance. Luminance Proportion, LR, CR is computed by dividing the minimal luminosity right into the optimum as gauged with a full screen driven at the particular values. For instance: A Lmin of 1 cd/m2 as well as Lmax of 450 cd/m2 would yield an LR of 450:1.

  • Ambient light

One of the significant screen problems is the payment of ambient light, specifically in bright areas, such as the ICU or ER. Not taking this factor right into account influences the capability to see pathology in the black location of the display. Ambient light originates from many instructions as an indirect source of lights; the correct terminology is scattered light. This contributes to the minimal luminance regarded, in much the same method as a rising tide similarly lifts all boats.

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