BS EN 61262-4:1995 Characteristics of electro-optical X-ray image intensifiers for medical electrical equipment. - Part 4. Determination of the image distortion
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The image distortion is a functional performance characteristic which describes deviations from a similarity representation of an image in the entrance plane to the output image of an electro-optical X-ray image intensifier. It will however be assumed that angular distortions like the S-shaped distortion of a straight line through the centre of the entrance field can be reduced to a small size by adequate magnetic shielding since the X-ray image intensifier itself is by construction very nearly axially symmetrical.
Therefore this standard will be confined to radial distortion. A slight S-shaped distortion may persist in spite of the shielding. Its influence on the measurement of magnification, described below, is negligible.
This International Standard applies to electro-optical X-ray image intensifiers for medical use, as components of diagnostic X-ray equipment. This International Standard describes a method of determining the image distortion of X-ray image intensifiers.
BS EN 61262-4:1995 Characteristics of electro-optical X-ray image intensifiers for medical electrical equipment. - Part 4. Determination of the image distortion