Wilkinson L E, Heggie J C, Johnston P N
Department of Medical Imaging, St. Vincent's Hospital Melbourne, Victoria.
Australas Phys Eng Sci Med. 1999 Jun;22(2):53-63.
By using the EGS4 Monte Carlo computer program the normalised mean glandular dose (MGD) was calculated for a breast model that is intended to reflect the composition of an "average" breast. The reliability of the calculation was established by comparing the predictions with previously published values for a breast model. The breast model used was then altered in order to reflect the possible extremes in glandular distribution that could occur within a compressed breast. These results show that the MGD could vary by up to a factor of four depending upon where the majority of glandular tissue is located within the breast. The impact of this variation in MGD upon risk assessment within mammography is then discussed.
通过使用EGS4蒙特卡罗计算机程序，针对一个旨在反映“平均”乳房组成的乳房模型计算了归一化平均腺体剂量（MGD）。通过将预测结果与先前发表的乳房模型值进行比较，确定了计算的可靠性。然后改变所使用的乳房模型，以反映在压缩乳房内可能出现的腺体分布极端情况。这些结果表明，根据乳房内大部分腺体组织所在位置，MGD可能会有高达四倍的变化。随后讨论了MGD这种变化对乳腺摄影风险评估的影响。
