IEC 60336:2020适用于医用诊断X射线管组件中的焦点，在X射线管电压高达150 kV（含150 kV）下工作。 本文件描述了采用数字检测器测定的测试方法: a)根据标称焦斑值的焦斑尺寸，范围为0.1至3.0； b)行扩展函数； c)一维调制传递函数； d)焦斑针孔射线照片， 以及用于指示依从性的装置。 在信息性附件中，描述了星形图案成像和开花值。 IEC 60336:2020取消并取代了2005年发布的第四版。本版构成技术修订版。 第五版相对于上一版的重大变化详见第E.6条。这些变化是:a)引入数字检测器和离散化误差； b)较少的规范性要求； c)支持狭缝相机和针孔相机； d)扭曲(歪斜)焦斑的重新引入； e)保持星形图案和开花值作为信息。

IEC 60336:2020 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.
IEC 60336:2020 cancels and replaces the fourth edition published in 2005. This edition constitutes a technical revision.
The significant changes of this fifth edition with respect to the previous edition are detailed in Clause E.6. These changes are:
a) introduction of digital detectors and discretization errors;
b) fewer normative requirements;
c) support for both SLIT CAMERA and PINHOLE CAMERA;
d) reintroduction of distorted (skewed) FOCAL SPOT;
e) keeping of STAR PATTERNS and BLOOMING VALUE as informative.