Tsung P
Med Phys. 1976;3(5):355-7. doi: 10.1118/1.594242.
A third-degree polynomial and power-law analysis with the method of least-squares fit are computed for backscatter factor with a continuous variation of field size and different beam quality of radiation from 1.0-mm Al external x ray to 60Co gamma ray. Three coefficients are required for a third-degree polynomial and two coefficients for power law method of each beam quality.
针对从1.0毫米铝滤过的外照射X射线到60钴γ射线等不同射线质且射野大小连续变化时的反向散射因子，采用最小二乘法拟合进行三次多项式和幂律分析。每种射线质的三次多项式需要三个系数，幂律方法需要两个系数。
