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The negatoscope is used to view medical images produced by a chain of high-tech equipment. This device, designed to read X-rays, is classified as a radiology accessory. It is nevertheless a decisive link in the quality chain. The accuracy of the radiological diagnosis and the radiologist's efficiency depend on the film reading conditions.

The negatoscope, probably due to its technical simplicity compared to the extremely complex nature of radiological equipment, is belittled in radiology departments and is not given the attention it deserves. Despite the undisputed technical progress achieved in medical imaging, the quality of the films can only be made full use of if they are read on a perfectly illuminated and homogeneous device.

3 essential characteristics need to be checked to ensure good negatoscope quality :

Colour temperature of tubes 
The ELLA LEGROS negatoscopes are equiped with 6500° Kelvin tubes, "daylight" type.

Illuminated surface homogeneity 
The homogeneity must be such that no zones can be under-illuminated to the point of hindering the doctor in exercising their role. The maximum deviation tolerated is a variation of 30% between the centre and the corners (8cm from the edges of the illuminated surface).

Light power 
The minimum luminance of a negatoscope, with an on/off switch, must be set to greater than 1700 cd/m².