IEC 60336 pdf download
IEC 60336 pdf download Medical electrical equipment – X-ray tube assemblies for medical diagnosis – Characteristics of focal spots
This International Standard applies to FOCAL SPOTs in medical diagnostic X-RAY TUBEassemblies for medical use, operating at X-RAY TUBE VOLTAGEs up to and including 200 kV.
This International Standard describes the test methods for evaluating FocAL sPOT character-istics and the means for indicating compliance.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references,only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
lEC60417-DB:2002: Graphical symbols for use on equipment 1)
IEC 60613，Electrical,thermal and loading characteristics of rotating anode X-ray tubes formedical diagnosis
IEC 60788:2004,Medical electrical equipment – Glossary of defined terms
3Terms and definitions
For the purposes of this document, the terms and definitions given in lEC 60788 together withthe following apply.
3.1
STAR PATTERN RESOLUTION LIMIT
characteristic of the FoCAL SPOT of an X-RAY TUBE; highest spatial frequency that can beresolved under specific measuring conditions
4Determinations for the evaluation of the FoCAL SPOT characteristics
4.1Statement of the FocAL SPoT characteristics
The FOCAL SPOT characteristics shall be stated for two normal directions of evaluation referredto as the length direction and width direction.An illustration for this clause can be found inFigure A.1.
4.2Longitudinal axis of the x-RAY TUBE ASSEMBLY
Generally, the longitudinal axis can be identified unambiguously. If the X-RAY TUBE ASSEMBLYdoes not have an identifiable longitudinal axis or if it is specified otherwise by theMANUFACTURER,the longitudinal axis shall be specified together with the FocAL SPoTcharacteristics.
4.3REFERENCE AxIs of the x-RAY TUBE ASSEMBLY
lf not specified otherwise, the REFERENCE AXIS is normal to the longitudinal axis and intersectsboth the centre of the ACTUAL FOCAL sPoT and the longitudinal axis of the X-RAY TUBEASSEMBLY.
4.4Direction of evaluation for the FoCAL sPoT length
The direction of evaluation for the FOCAL SPOT length is normal to the REFERENCE AXIs in theplane given by the REFERENCE AXIS and the longitudinal axis of the x-RAY TUBE ASSEMBLY.
4.5Direction of evaluation for the FoCAL SPoT width
The direction of evaluation for the FOCAL SPOT width is normal to the longitudinal axis of the x-RAY TUBE ASSEMBLY and normal to the REFERENCEAXIS.
5 FOCAL SPoT camera set-up
5.1Overview
This clause deals with the design requirements of a camera for the production of FOCAL SPOTSLIT RADIOGRAMs to be used for the determination of FOCAL SPOT dimensions in accordancewith Clause 8, and the determination of the modulation transfer function in accordance withClause 9.
This clause deals also with the design requirements of a camera for the production of FOcALsPOT PINHOLE RADIOGRAMS.
