IEC 60336-2020 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 ASSEMBUES 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) INE SPREAD FUNCTIONS:
c) one-dimensional MODULATION TRANSF ER FUNCTIONS;
9) FOCAL SPOT PINHOLE RADIOGRAMS,
and the means for Indicating complance.
In informative annexes, STAR PATTERN imaging and BLOOMING VALUE are described.
2 Normative references
The ollowing 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) aples.
IEC 60417. Graphical symbols for use on equipoment (available at ht://wwgaphiwai.a symbols. info/equipment)
IEC 60601-1:2005, Medical electrical equipment – Part 1: General requirements for basic safety and essental pertormance
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 Xray equipment
IEC 60613:2010. Elecrical and loading characteristics of X-ray tube assemblies for medica1 diagnosis
IEC TR 60788 2004. Medical electrical equipment – Glossary of detined terms
3 Terms and definitions
For the purposes of this document, terms and definitions given in IEC TR 60788:2004,IEC 60613:2010, IEC 60601-1:2005 and lEC 60601-1:2005/AMD1:2012. lEC 60601-1-3:2008 and IEC 60601-1-3:2008/AMD1:2013 and the fllowing apply.
Iso and IEC maintain terminological databases for use in standardization at the fllowing addresses:
IEC Electropedia: available at htp://www electropedia org/
Iso Online browsing plaform: available at htpt//ww.wo .org/obp
3.1 ACTUAL FOCAL SPOT
area on the surface of the TARGET that intercepts the beam of accelerated particles
Nole 1 to entny; Regarding aceleratnd particles, only the intended primary beam is included.
3.2 BLOOMING VALUE
ratio of two resolution limits obtained under specific LOADING conditions
Nole 1 to entry: The BLOOMNG VALUE s a characteristie 0 the EFFECIVE FOCAL SPOT of an X-RAY TuBE.
3.3 DIGITAL FOCAL SPOT DETECTOR
pixel-array device applied to FOCAL SPOT analysis o X-RAY TUBE ASSEMBLIES, providing a digital output value per pixel which is linearly related to the input Xray 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 oblained 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.IEC 60336 pdf download.