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.dition 5.0 2020-12 INTERNATIONAL STANDARD NORME INTERNATIONALE colour inside Medical electrical equipment – X-ray tube assemblies for medical diagnosis – Focal spot dimensions and related characteristics Appareils électromédicaux – Gaines équipées pour diagnostic médical – Dimensions des foyers et caractéristiques connexes IEC 60336:2020-12(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？ 2020