標準號：BS EN 61267-2006
中文標準名稱：醫用診斷X射線設備.測定特性時使用的輻射條件
英文標準名稱：Medical diagnostic X-ray equipment - Radiation conditions for use in the determination of characteristics
標準類型：C43
發布日期：2006/2/28 12:00:00
實施日期：2006/2/28 12:00:00
中國標準分類號：C43
國際標準分類號：11.040.50
引用標準：IEC 61676-2002;ISO 4037-1-1996;IEC 61674-1997
適用范圍：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