IEC 60336-2020 pdf download.Medical electrical equipment – X-ray tube assemblies for medical diagnosis – Focal spot dimensions and related characteristics.
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 1 50 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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 6041 7, Graphical symbols for use on equipment (available at http://www.graphical- symbols.info/equipment)
IEC 60601 -1 :2005, Medical electrical equipment – Part 1: General requirements for basic safety and essential performance
IEC 60601 -1 :2005/AMD1 :201 2
IEC 60601 -1 -3:2008, Medical electrical equipment – Part 1-3: General requirements for basic safety and essential performance – Collateral Standard: Radiation protection in diagnostic X-ray equipment
IEC 60601 -1 -3:2008/AMD1 :201 3
IEC 6061 3:201 0, Electrical and loading characteristics of X-ray tube assemblies for medical diagnosis
IEC TR 60788:2004, Medical electrical equipment – Glossary of defined terms
3 Terms and definitions
For the purposes of this document, terms and definitions given in IEC TR 60788:2004,IEC 6061 3:201 0, IEC 60601 -1 :2005 and IEC 60601 -1 :2005/AMD1 :201 2, IEC 60601 -1 -3:2008 and IEC 60601 -1 -3:2008/AMD1 :201 3 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 ACTUAL FOCAL SPOT
area on the surface of the TARGET that intercepts the beam of accelerated particles
Note 1 to entry: Regarding accelerated particles, only the intended primary beam is included.
3.2 BLOOMING VALUE
ratio of two resolution limits obtained under specific LOADING conditions
Note 1 to entry: The BLOOMING VALUE is a characteristic of the EFFECTIVE FOCAL SPOT of an X- RAY TUBE .
3.3 DIGITAL FOCAL SPOT DETECTOR
pixel-array device applied to FOCAL SPOT analysis of X- RAY TUBE ASSEMBLIES , providing a digital output value per pixel which is linearly related to the input X-ray intensity
3.4 EFFECTIVE FOCAL SPOT
FOCAL SPOT perpendicular PROJECTION of the ACTUAL FOCAL SPOT on the REFERENCE PLANE
3.5 FOCAL SPOT PINHOLE RADIOGRAM
RADIOGRAM obtained by means of a PINHOLE CAMERA , showing the shape and orientation of an EFFECTIVE FOCAL SPOT , and the spatial distribution of intensity of radiation across it
3.6 FOCAL SPOT SLIT RADIOGRAM
RADIOGRAM obtained by means of a SLIT CAMERA , showing the distribution, across an EFFECTIVE  FOCAL SPOT , in the direction normal to the length of the slit, of the intensity of the radiation emitted
3.7 FOCAL SPOT STAR RADIOGRAM
RADIOGRAM obtained by means of a STAR PATTERN CAMERA for the determination of the STAR PATTERN RESOLUTION LIMIT in one or more directions across an EFFECTIVE FOCAL SPOT
3.8 NOMINAL FOCAL SPOT VALUE
dimensionless numerical value having a specific relation to the dimensions of the EFFECTIVE FOCAL SPOT of an X- RAY TUBE , measured under specific conditions
3.9 PINHOLE CAMERA
assembly of EQUIPMENT used to obtain a FOCAL SPOT PINHOLE RADIOGRAM
3.1 0 REFERENCE AXIS
< RADIATION SOURCE > line in the REFERENCE DIRECTION through the centre of the RADIATION SOURCE.IEC 60336 pdf download.