Medical electrical equipment. X-ray tube assemblies for medical diagnosis. Focal spot dimensions and related characteristics
Medical electrical equipment. X-ray tube assemblies for medical diagnosis. Focal spot dimensions and related characteristics
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1 Scope This document applies to focal spots in medical diagnostic X- ray tube assemblies for medical use, operating at X- ray tube voltages up to and including 150 kV. This document describes the test methods employing digital detectors for determining:
a)
focal spot dimensions in terms of nominal focal spot values , ranging from 0,1 to 3,0;
b) line spread functions ;
c) one-dimensional modulation transfer functions ;
d)
focal spot pinhole radiograms ,
and the means for indicating compliance. In informative annexes, star pattern imaging and blooming value are described.
Другие стандарты BS