IEC 61267-2005
医用诊断X射线设备.测定特性时使用的辐射条件
Medical diagnostic X-ray equipment - Radiation conditions for use in the determination of characetristics
IEC 61267-2005 发布历史
This International Standard applies to test procedures which, for the determination of characteristics of systems or components of medical diagnostic X-RAY EQUIPMENT, require well-defined RADIATION CONDITIONS. Except for mammography, this standard does not apply to conditions where discontinuities in radiation absorption of elements are deliberately used to modify properties of the RADIATION BEAM (for example by rare earth filters). The most complete specification of RADIATION FIELDS is given by the spectral distribution of the photon fluence. Since the measurement of X-RAY SPECTRA is a demanding task, this standard expresses RADIATION QUALITIES in terms of the X-RAY TUBE VOLTAGE, the first and second HALFVALUE LAYER. In the case of RADIATION CONDITIONS, specifications are performed additionally in terms 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 the mutually conflicting requirements of avoiding excessive efforts for establishing a RADIATION QUALITY and of the complete absence of any ambiguity in the definition of a RADIATION QUALITY. 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 XRAY TUBE VOLTAGE having the same first HALF-VALUE LAYER can still have quite different spectral distributions. Given the inherent ambiguity in the characterization of RADIATION QUALITY, 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 to jeopardise the underlying objective of this standard. This standard is to ensure that measurements of the properties of medical diagnostic equipment should produce consistent results if RADIATION QUALITIES or RADIATION CONDITIONS in compliance with this standard are used. To achieve this objective, certain degrees of freedom in the way in which a RADIATION CONDITION could be established in the framework of the first edition of this standard have been removed. The essential restriction introduced in this second edition is that the X-RAY TUBE VOLTAGE is measured and set to its 'correct' value. The second step is to attempt to establish the prescribed first HALF-VALUE LAYER by adding into the beam the necessary amount of ADDITIONAL FILTRATION. If the INHERENT FILTRATION provided by the X-RAY TUBE alone is so strong that the HALF-VALUE LAYER of the RADIATION BEAM emerging from the X-RAY TUBE ASSEMBLY as such is larger than that to be established, the X-RAY TUBE ASSEMBLY used is not suited for producing the desired RADIATION CONDITION. This may occur if the anode angle of the X-RAY TUBE ASSEMBLY is too small and/or in the case of excessive anode roughening due to tube ageing. In the approach outlined in the two preceding paragraphs the X-RAY TUBE VOLTAGE plays a decisive role. It is therefore essential that the ‘correct’ X-ray tube voltage is chosen irrespective of the type of high voltage generator connected to the X-RAY TUBE. The way in which this is realized in this standard is by measuring the X-RAY TUBE VOLTAGE in terms of the PRACTICAL PEAK VOLTAGE. This quantity is a weighted mean of all values of the X-RAY TUBE VOLTAGE occurring during an exposure. The weighting is done in such a way that identical values of the PRACTICAL PEAK VOLTAGE give identical values of the low level contrast on a radiograph irrespective of the waveform supplied by the generator.
IEC 61267-2005由国际电工委员会 IX-IEC 发布于 2005-11。
IEC 61267-2005 在中国标准分类中归属于: C43 医用射线设备，在国际标准分类中归属于: 11.040.50 射线照相设备。
IEC 61267-2005 发布之时，引用了标准
- IEC 61674-1997 医用电气设备 用于X射线诊断成像中带电离室和/或半导体探测器的剂量仪
- IEC 61676-2002 医用电气设备.在放射诊断中X射线管电压的无伤害性测量用剂量测定仪器
- ISO 4037-1-1996 校准剂量仪和剂量率仪及确定其光子能量响应的Χ和γ参考辐射 第1部分:辐射特性产生方法
IEC 61267-2005的历代版本如下：
- 1994年09月 IEC 61267-1994 医用诊断X射线设备 测定特性时使用的辐射条件
- 2005年11月 IEC 61267-2005 医用诊断X射线设备.测定特性时使用的辐射条件
- 标准号
- IEC 61267-2005
- 发布日期
- 2005年11月
- 实施日期
- 废止日期
- 无
- 中国标准分类号
- C43
- 国际标准分类号
- 11.040.50
- 发布单位
- IX-IEC
- 引用标准
- IEC 61674-1997 IEC 61676-2002 ISO 4037-1-1996
- 被代替标准
- IEC 62C/391/FDIS-2005 IEC 61267-1994
- 适用范围
- This International Standard applies to test procedures which, for the determination of characteristics of systems or components of medical diagnostic X-RAY EQUIPMENT, require well-defined RADIATION CONDITIONS. Except for mammography, this standard does not apply to conditions where discontinuities in radiation absorption of elements are deliberately used to modify properties of the RADIATION BEAM (for example by rare earth filters). The most complete specification of RADIATION FIELDS is given by the spectral distribution of the photon fluence. Since the measurement of X-RAY SPECTRA is a demanding task, this standard expresses RADIATION QUALITIES in terms of the X-RAY TUBE VOLTAGE, the first and second HALFVALUE LAYER. In the case of RADIATION CONDITIONS, specifications are performed additionally in terms 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 the mutually conflicting requirements of avoiding excessive efforts for establishing a RADIATION QUALITY and of the complete absence of any ambiguity in the definition of a RADIATION QUALITY. 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 XRAY TUBE VOLTAGE having the same first HALF-VALUE LAYER can still have quite different spectral distributions. Given the inherent ambiguity in the characterization of RADIATION QUALITY, 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 to jeopardise the underlying objective of this standard. This standard is to ensure that measurements of the properties of medical diagnostic equipment should produce consistent results if RADIATION QUALITIES or RADIATION CONDITIONS in compliance with this standard are used. To achieve this objective, certain degrees of freedom in the way in which a RADIATION CONDITION could be established in the framework of the first edition of this standard have been removed. The essential restriction introduced in this second edition is that the X-RAY TUBE VOLTAGE is measured and set to its 'correct' value. The second step is to attempt to establish the prescribed first HALF-VALUE LAYER by adding into the beam the necessary amount of ADDITIONAL FILTRATION. If the INHERENT FILTRATION provided by the X-RAY TUBE alone is so strong that the HALF-VALUE LAYER of the RADIATION BEAM emerging from the X-RAY TUBE ASSEMBLY as such is larger than that to be established, the X-RAY TUBE ASSEMBLY used is not suited for producing the desired RADIATION CONDITION. This may occur if the anode angle of the X-RAY TUBE ASSEMBLY is too small and/or in the case of excessive anode roughening due to tube ageing. In the approach outlined in the two preceding paragraphs the X-RAY TUBE VOLTAGE plays a decisive role. It is therefore essential that the ‘correct’ X-ray tube voltage is chosen irrespective of the type of high voltage generator connected to the X-RAY TUBE. The way in which this is realized in this standard is by measuring the X-RAY TUBE VOLTAGE in terms of the PRACTICAL PEAK VOLTAGE. This quantity is a weighted mean of all values of the X-RAY TUBE VOLTAGE occurring during an exposure. The weighting is done in such a way that identical values of the PRACTICAL PEAK VOLTAGE give identical values of the low level contrast on a radiograph irrespective of the waveform supplied by the generator.