Radiation doses received in the UK Breast Screening Programme in 2001 and 2002.
Radiation doses received in the UK Breast Screening Programme in 2001 and 2002.
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2001 年和 2002 年英国乳房筛查计划中接受的辐射剂量。
DOI：
10.1259/bjr/41095952
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Oduko
中科院分区：
文献类型：
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作者：
K. Young;A. Burch;J. Oduko
在英国乳房筛查计划(NHSBSP)的筛查中心，对接受乳房X光检查的女性样本的平均腺体剂量(MGD)进行了常规测量。本文回顾了2001年和2002年在NHSBSP放映期间收集的具有代表性的大样本剂量测量，其中包括16505名妇女的53218张胶片，使用了290台X光机。平均MGD值为2.23mGy一张斜位片和1.96mGy一张头尾片，与1997年和1998年在NHSBSP中发现的结果相似。越来越多地使用具有自动光束质量选择的尖端设备，减少了大乳房接受的辐射剂量，只有2%的斜向乳房X光照片的剂量超过5mGy.越来越多的大幅面胶片的使用也减少了对这一亚组的剂量。然而，由于在每次就诊时采用两个切面筛查，每个妇女的总剂量有所增加。标准乳房的MGD值从0.76mGy值到2.29mGy值不等，97%的单位低于建议的上限2mGy值，说明了严格质量控制的好处。在50-54岁和60-年龄段之间，剂量减少了3%。这项研究证实，对于55 mm厚的乳房，建议的国家诊断参考水平(NDRL)为3.5mGy值，是识别给予异常高剂量的系统的合适值，只有3.5%的系统超过这一水平。在大多数情况下，这些较高的剂量可以通过一种特殊制造的X射线装置及其操作模式的设计来解释。平均乳房大小斜视的平均剂量与标准乳房的剂量有很好的相关性，通常高出42%。这突显了修订英国使用的标准乳房的定义的必要性，以更好地反映临床实践中的暴露因素和剂量。
The mean glandular doses (MGD) to samples of women attending for mammographic screening are measured routinely at screening centres in the UK Breast Screening Programme (NHSBSP). This paper reviews a large representative sample of dose measurements collected during screening in the NHSBSP in 2001 and 2002 for 53 218 films, using 290 X-ray sets, for 16 505 women. The average MGD was 2.23 mGy per oblique film and 1.96 mGy per craniocaudal film; similar to those found previously in the NHSBSP for the years 1997 and 1998. Increasing use of sophisticated units with automatic beam quality selection has reduced the radiation dose received by large breasts, with only 2% of oblique mammograms having doses in excess of 5 mGy. The increasing use of large format film has also reduced the doses to this sub-group. However the total dose per woman has increased due to the introduction of two view screening at every visit. The MGD to the standard breast was found to vary from 0.76 mGy to 2.29 mGy, with 97% of units below the recommended upper limit of 2 mGy, illustrating the benefit of strict quality control. A reduction in dose of 3% was observed between the age bands 50-54 years and 60-64 years. This study has confirmed that the proposed national diagnostic reference level (NDRL) of 3.5 mGy for 55 mm thick breasts is an appropriate value to identify systems giving unusually high doses, with just 3.5% of systems exceeding this level. In most cases these higher doses were explained by the design of one particular make of X-ray set and its mode of operation. Average doses for oblique views of average sized breasts were fairly well correlated with the dose to the standard breast, and typically 42% higher. This highlights the need for a revised definition of the standard breast used in the UK to better reflect the exposure factors and doses received in clinical practice.