Yuen K, Kornelsen R O
Division of Radiation Physics, Cancer Control Agency of British Columbia, Vancouver, Canada.
Med Phys. 1988 Jan-Feb;15(1):74-7. doi: 10.1118/1.596160.
The Batho equation gives a satisfactory method to correct the dose for points in the electronic equilibrium region for a uniform slab of inhomogeneity in a photon beam. In spite of the many investigations, we believe no simple and adequate method has been found for routine clinical dose calculations which require dose correction of a small-volume inhomogeneity in an arbitrary location. In the present report, we combine the values of the two calculation types of the differential Batho method, which we have developed previously, to give a new calculated value for the scatter perturbation due to an annulus of inhomogeneity. The coefficients in the combination, which we derived from a detailed analysis of the scatter perturbation, are simple geometrical ratios. The new calculated values are in good agreement with measured values. We believe this application of the differential Batho method can provide a practical and accurate method of correcting for inhomogeneities of any size and shape in clinical dose calculations.
巴索方程为光子束中均匀非均匀性平板电子平衡区域内各点的剂量校正提供了一种令人满意的方法。尽管进行了许多研究，但我们认为尚未找到一种简单且适用的方法用于常规临床剂量计算，因为这种计算需要对任意位置的小体积非均匀性进行剂量校正。在本报告中，我们将先前开发的微分巴索方法的两种计算类型的值相结合，以得出由于非均匀性环带引起的散射微扰的新计算值。我们从对散射微扰的详细分析中得出的组合系数是简单的几何比率。新的计算值与测量值吻合良好。我们认为微分巴索方法的这种应用能够为临床剂量计算中校正任何尺寸和形状的非均匀性提供一种实用且准确的方法。
