BS EN 61267-2006 医用诊断X射线设备.测定特性时使用的辐射条件

标准号：BS EN 61267-2006
中文标准名称：医用诊断X射线设备.测定特性时使用的辐射条件
英文标准名称：Medical diagnostic X-ray equipment - Radiation conditions for use in the determination of characteristics
标准类型：C43
发布日期：2006/2/28 12:00:00
实施日期：2006/2/28 12:00:00
中国标准分类号：C43
国际标准分类号：11.040.50
引用标准：IEC 61676-2002;ISO 4037-1-1996;IEC 61674-1997
适用范围：This International Standard applies to test procedures which, for the determination ofcharacteristics of systems or components of medical diagnostic X-RAY EQUIPMENT, requirewell-defined RADIATION CONDITIONS.Except for mammography, this standard does not apply to conditions where discontinuities inradiation absorption of elements are deliberately used to modify properties of the RADIATIONBEAM (for example by rare earth filters).This standard deals with methods for generating RADIATION BEAMS with RADIATION CONDITIONSwhich can be used under test conditions typically found in test laboratories or inmanufacturing facilities for the determination of characteristics of medical diagnostic X-RAYEQUIPMENT.Examples of such RADIATION QUALITIES are RADIATION BEAMS emerging through the filtrationfrom the X-RAY SOURCE ASSEMBLY. RADIATION CONDITIONS represent the more general case,where SCATTERED RADIATION emerges from an EXIT SURFACE of a PATIENT or a PHANTOM. Thisrequires a well defined geometrical arrangement.The most complete specification of RADIATION FIELDS is given by the spectral distribution of thephoton fluence. Since the measurement of X-RAY SPECTRA is a demanding task, this standardexpresses RADIATION QUALITIES in terms of the X-RAY TUBE VOLTAGE, the first and second HALFVALUELAYER. In the case of RADIATION CONDITIONS, specifications are performed additionally interms of PHANTOM properties and geometry.The attempt to characterize a spectral distribution just by means of the X-RAY TUBE VOLTAGE,the first and possibly the second HALF-VALUE LAYER is thus a compromise between themutually conflicting requirements of avoiding excessive efforts for establishing a RADIATIONQUALITY and of the complete absence of any ambiguity in the definition of a RADIATIONQUALITY. Due to differences in the design and the age of X-RAY TUBES in terms of anode angle,anode roughening and INHERENT FILTRATION, two RADIATION QUALITIES produced at a given XRAYTUBE VOLTAGE having the same first HALF-VALUE LAYER can still have quite differentspectral distributions. Given the inherent ambiguity in the characterization of RADIATIONQUALITY, it is essential that further tolerances introduced by allowing certain ranges of values,e.g. for X-RAY TUBE VOLTAGE and first HALF-VALUE LAYER, must be sufficiently small not tojeopardise the underlying objective of this standard. This standard is to ensure thatmeasurements of the properties of medical diagnostic equipment should produce consistentresults if RADIATION QUALITIES or RADIATION CONDITIONS in compliance with this standard areused.Licensed Copy