Digital radiography consists of four major steps which include X-ray detection, digitization, image processing and display. During image processing the digital data is evaluated and manipulated before being displayed, and is used to construct the histogram, which is the graphic display of the distribution of pixel values. The digitization process varies from device to device and may suffer variations even when the same digital equipment is used throughout time. So it requires a high level emphasis to evaluate if a device used to capture an image can be trusted in subsequent digitization. Acoefficient value relating the variability of pixel values given to the image throughout the digitization process was calculated and was called pixel value reproducibility (PVR) and a series of hypothetical tests were performed on calculated values and mean pixel values which throw light on digitizer characteristics.

Keywords: Digital Archival, Digital Radiography, Mean Pixel Values, T-Test, Image formats.