QA/QC OF IMAGE DISPLAY EQUIPMENT

FILM VIEWING EQUIPMENT ("VIEWING BOXES")

The quality and characteristics of the viewing equipment play a decisive role in the recognition of diagnostic details in the radiological image.

The measurable, physical parameter for viewing equipment is the light stream (light quantity) which is emitted from the viewing surface of the equipment.

If the light stream L (lat. Lumen) is put in relation to the light emitting surface, you produce the measurement parameter

Luminance L: L = Candela / Square meter (cd/m2).

LUMINANCE

A properly exposed X-Ray film has a mid-optical density of 1.2

To be able to diagnose details in the lower density range of the density curve (D = 0.3 – 0.6), the luminance of the viewing device must be able to be reduced.

To view high density (Dopt > 2.2) areas of X-Ray films, a strong light source with an iris shutter (“hot light”) is needed. This light source must have a luminance of at least 5000 cd/m2.

Due to their great importance in making diagnostic details of radiographs visible, all viewing devices must undergo an acceptance test and routine constancy tests.

REPEAT TESTS FOR VIEWING DEVICES, WHICH ARE ROUTINELY USED FOR DIAGNOSIS:

ACCEPTANCE TEST REQUIREMENTS

DIN TEST TOOL

It stands for "Deutsches Institut für Normung", meaning "German institute for standardisation".

APPLICATIONS OF USING DIN TEST TOOLIdeal for use as a preventive maintenance quality control test tool, the “DIN” Test Tool can also be used to take regularly scheduled measured data points from the image, such as line pair resolution measurements, ROIs (regions of interest) and geometry symmetry . Measurements/angle can be used to evaluate monitor, as well as printed film image quality .

 SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS

Is founded in 1916 as the Society of Motion Picture Engineers or SMPE is an international professional association, based in the United States of America of engineers working in the motion imaging industries.

CONSTANCY TEST REQUIREMENTS

IMAGE VIEWING AND DISPLAY DEVICES