This document applies to X- RAY TUBE ASSEMBLIES and to FILTERING MATERIAL , in medical diagnostic applications up to a HIGH VOLTAGE of 150 kV. For HIGH VOLTAGES greater than 50 kV, this document applies to X- RAY TUBE ASSEMBLIES with tungsten or tungsten-alloy TARGETS only.
NOTE 1 The FILTERING MATERIAL in the X- RAY BEAM can be removable or irremovable; it can be positioned in any orientation or can have any shape (e.g. tapering thickness) – although usually plane-parallel material, perpendicular to the REFERENCE AXIS is applied. Examples of FILTERING MATERIALS are ADDED FILTERS , a PATIENT table (in case of an under-table X- RAY TUBE ASSEMBLY ), materials in the BEAM LIMITING DEVICE , or a breast COMPRESSION DEVICE .
NOTE 2 The methodology and statement of compliance given in this document is for flat FILTERS only, but the methodology can be used for any kind of non-flat FILTER . In that case further data are included in order to produce useful results, e.g. field size, geometry/position of FILTER , etc.
This document defines the concept of PERMANENT FILTRATION of X- RAY TUBE ASSEMBLIES , and it defines the term FILTERING MATERIAL . Methods are given to determine the PERMANENT FILTRATION of an X- RAY TUBE ASSEMBLY and for determining the QUALITY EQUIVALENT FILTRATION of FILTERING MATERIALS .
It contains requirements for statements of compliance of X- RAY TUBE ASSEMBLIES in ACCOMPANYING DOCUMENTS and for markings on X- RAY TUBE ASSEMBLIES , and for indications and statements of compliance of FILTERING MATERIAL .
