Martens H, Breitling G
Strahlentherapie. 1981 Sep;157(9):576-80.
With regard to the moving field irradiation of the thoracic wall with electrons, the dependence of the surface dose from the depth of the rotation axis, which had been determined theoretically and under simplifying hypotheses, is checked by phantom measurements. There is conformity between measurement and calculation if the moving field irradiation extends over an angular dimension which contains also fully the contribution of the electrons scattered in the collimated region. The consequences for the shielding of the environment of the irradiated region are discussed. The admissible deviations of the thorax from a circular cylindric form for given maximum dose differences can be taken from the calculations. A nearly constant surface dose can be reached despite differences of the thorax form, if the scattering of electrons perpendicular to the rotation axis comes from divergency centres whose distance from the rotation axis corresponds to the double length of the average thorax radius.
关于用电子束对胸壁进行移动野照射，通过模体测量来检验在理论上并在简化假设下确定的表面剂量与旋转轴深度的相关性。如果移动野照射在一个角度范围内进行，且该角度范围也充分包含了在准直区域散射的电子的贡献，则测量值与计算值相符。讨论了对受照区域周围屏蔽的影响。对于给定的最大剂量差异，胸壁与圆柱形状的允许偏差可从计算中得出。如果垂直于旋转轴的电子散射来自与旋转轴的距离相当于胸壁平均半径两倍的发散中心，那么尽管胸壁形状存在差异，仍可达到近乎恒定的表面剂量。
