Klein R, Aichinger H, Joite-Barfuss S, Säbel M, Schulz-Wendtland R
Institut für Medizinische Physik Friedrich-Alexander-Universität, Erlangen.
Aktuelle Radiol. 1995 Nov;5(6):394-7.
In mammography, it is currently assumed that the mean dose to glandular tissue DG is relevant to characterize the risk of carcinogenesis. The mean glandular dose DG results from the measured air kerma Ka at the location of the entrance surface of the breast multiplied by the conversion factors g, which usually are calculated with the help of Monte-Carlo-Simulations and which are mostly given for a standard composition of tissue (50% glandular/50% adipose tissue). By means of the signals of the double-detector of the automatic-exposure-control of the mammographic device, it is possible to obtain information about the mean composition of the breast-tissue. The knowledge of this composition enables a better calculation of the mean glandular dose DG by using conversion factors that are adapted to the tissue. This method was applied to a total of 1020 women. The comparison with the evaluation by using the conventional method shows, on average, deviations in the mean glandular dose of 9%, in specific cases the differences can be as much as 35%.
在乳腺X线摄影中，目前假定乳腺组织的平均剂量DG与表征致癌风险相关。平均腺体剂量DG是由乳房入口表面位置处测得的空气比释动能Ka乘以转换因子g得出的，转换因子g通常借助蒙特卡洛模拟计算得出，并且大多是针对标准组织成分（50%腺体/50%脂肪组织）给出的。借助乳腺摄影设备自动曝光控制的双探测器信号，可以获取有关乳房组织平均成分的信息。了解这种成分后，通过使用适用于该组织的转换因子，能够更好地计算平均腺体剂量DG。该方法总共应用于1020名女性。与使用传统方法的评估结果相比，平均而言，平均腺体剂量的偏差为9%，在特定情况下，差异可能高达35%。
