Robson K J, Kotre C J, Faulkner K
Regional Medical Physics Department, Newcastle General Hospital, Newcastle upon Tyne, UK.
Br J Radiol. 1992 Apr;65(772):334-8. doi: 10.1259/0007-1285-65-772-334.
Data produced by a computer model are presented which allow the amount of molybdenum filtration on a molybdenum target mammographic X-ray set to be estimated from the measurement of the half value layer (HVL) in aluminium. Existing data refer either to tungsten target tubes or to molybdenum target tubes for a single anode angle and a constant potential waveform with the compression plate present. In addition to the tube voltage, the present data take account of the waveform of the tube potential and target angle. The results of an experimental verification of the model are presented and the effect of the geometry used in the experimental set-up discussed. Theoretical predictions of the molybdenum filter thickness made using the data from the model are in good agreement with the measured filter thickness, provided that attention is paid to the experimental geometry.
文中给出了计算机模型生成的数据，这些数据能让我们根据铝中半价层（HVL）的测量值来估算钼靶乳腺X射线机上钼滤过的量。现有数据要么是关于钨靶管的，要么是关于单个阳极角度且有压缩板时恒定电位波形的钼靶管的。除了管电压外，当前数据还考虑了管电位的波形和靶角度。文中展示了该模型的实验验证结果，并讨论了实验装置中所使用几何结构的影响。只要注意实验几何结构，利用该模型数据对钼滤过器厚度进行的理论预测与测量的滤过器厚度吻合良好。
