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现行 IEC 60627:2013
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Diagnostic X-ray imaging equipment - Characteristics of general purpose and mammographic anti-scatter grids 诊断X光成像设备 - 通用和乳房X射线防散射网格的特点
发布日期: 2013-07-09
IEC 60627:2013适用于医用诊断X射线成像设备中使用的防散射网格。抗散射网格用于减少特别是在患者体内产生的散射辐射对图像接收区域的入射,从而改善X射线图案的对比度。本国际标准规定了防散射网格特性的定义、测定和指示。在本标准中,仅考虑线性网格。由于目前在乳房X线照相术中仅使用聚焦网格,因此该标准仅限于涉及乳房X线照相抗散射网格的聚焦网格。本标准不适用于验收试验。该标准不涵盖网格区域内性能的同质性。本标准适用于抗-测试条件下的散射网格。这些条件通常在负责组织的现场是不具备的。本第三版取消并取代2001年出版的第二版,构成技术修订。在此版本中,钨酸钙荧光屏不再可用,已被氧化硫化钆(GOS)荧光屏取代。此外,引入了一个新的质量参数:图像改善因子或Q因子,它更好地描述了抗散射网格的特性,特别是对于数字探测器应用。第三版与之前的第二版之间的进一步区别在于: -需要新的仪器来测量初级辐射的透射率、散射辐射的透射率和总辐射的透射率,因为由钨酸钙荧光粉制成的荧光屏已经过时,不再可用;-修改了用于测量初级辐射透射率、散射辐射透射率和总辐射透射率的体模的定义,并省略了对IEC 61267的引用; -用于测量的辐射条件已经调整,现在是IEC 61267:2005中规定的RQR和RQR-M条件。
IEC 60627:2013 is applicable to anti-scatter grids used in medical diagnostic X-ray imaging equipment. Anti-Scatter Grids are used to reduce the incidence of scattered radiation, produced particularly in the body of the patient, upon the image reception area and thus to improve the contrast of the X-ray pattern. This International Standard specifies the definitions, determination and indication of characteristics of anti-scatter grids. In this standard only linear grids are considered. Since at present only focused grids are used in mammography, this standard is restricted to focused grids where mammographic anti-scatter grids are concerned. This standard is not intended to be applied for acceptance tests. This standard does not cover the homogeneity of performance over the area of a grid. This standard is intended to be applied for the determination of the characteristics of anti-scatter grids under test conditions. These conditions are not usually available at the site of the responsible organization. This third edition cancels and replaces the second edition published in 2001, and constitutes a technical revision. In this revision calcium tungstate phosphor fluorescent screens, which are no longer available, have been replaced by gadolinium oxysulphide (GOS) fluorescent screens. Further, a new quality parameter is introduced: the Image Improvement Factor or Q-factor, which better describes the properties of the anti-scatter grid, especially for digital detector applications. Further differences between this third edition and the previous second edition are:
- new instrumentation is prescribed for measurements of the transmission of primary radiation, the transmission of scattered radiation and the transmission of total radiation, because fluorescent screens made of calcium tungstate phosphors are outdated and are no longer available;
- the definition of the phantom used for measurements of the transmission of primary radiation, the transmission of scattered radiation and the transmission of total radiation is modified and references to IEC 61267 are omitted;
- and the radiation conditions used for the measurements have been adapted and are now the RQR and RQR-M conditions specified in IEC 61267:2005.
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归口单位: TC 62/SC 62B
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