Kirby T H, Gastorf R J, Hanson W F, Berkley L W, Gagnon W F, Hazle J D, Shalek R J
Med Phys. 1985 May-Jun;12(3):357-61. doi: 10.1118/1.595696.
Central axis depth dose measurements were made by the Radiological Physics Center on over 70 electron-producing machines used in radiation therapy. These data were consistent for each machine model and nominal energy. However, the data show that depth dose relations can vary significantly among different machine models for electron beams having the same nominal energy. Analysis shows that both the method used to achieve beam flatness and the mean incident electron energy determine the central axis depth dose curve past the depth of maximum dose. A linear relation of depth dose versus mean incident electron energy is used to predict depth dose to within 2 mm for most electron beams used clinically at depths greater than d95.
放射物理中心对70多台用于放射治疗的电子产生机器进行了中心轴深度剂量测量。这些数据对于每个机器型号和标称能量都是一致的。然而，数据表明，对于具有相同标称能量的电子束，不同机器型号之间的深度剂量关系可能会有显著差异。分析表明，用于实现射野平坦度的方法和平均入射电子能量都决定了超过最大剂量深度后的中心轴深度剂量曲线。深度剂量与平均入射电子能量的线性关系被用于预测临床上大多数电子束在大于d95的深度处2毫米以内的深度剂量。
