Medical electrical equipment. Diagnostic X-rays - Determination of quality equivalent filtration and permanent filtration
Medical electrical equipment. Diagnostic X-rays - Determination of quality equivalent filtration and permanent filtration
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1 Scope 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 th...
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