6、10和23兆电子伏特光子能量下，原射线外各点剂量的计算与测量。
Calculation and measurement of the dose at points outside the primary beam for photon energies of 6, 10, and 23 MV.
作者信息
van der Giessen P H
机构信息
Dr. Bernard Verbeeten Institute, Department of Clinical Physics, Tilburg, The Netherlands.
出版信息
Int J Radiat Oncol Biol Phys. 1994 Dec 1;30(5):1239-46. doi: 10.1016/0360-3016(94)90335-2.
PURPOSE
A generalized model is developed to calculate the dose at any point in the body outside the primary beam, using experimentally determined data.
METHODS AND MATERIALS
The contribution of leakage radiation, radiation scattered from the collimator, from the floor, and in the patient was measured for 6, 10, and 23 MV photons.
RESULTS
The radiation scattered in the patient and the radiation scattered from the collimator exhibit a strong dependence on field size and distance and are predominant only at short distances. At larger distances the leakage radiation makes the largest contribution. With appropriate factors, correcting for patient dimensions and field shape, the accuracy is better than +/- 50%.
CONCLUSION
It is possible to calculate the contribution of radiation scattered in the patient at any point of the body outside the primary beam for photons with an energy up to 23 MV. At large distances this contribution increases with energy. Radiation leaking through, and scattering from the collimator has to be measured for each individual treatment machine.
目的
利用实验测定的数据，开发一种通用模型，用于计算原射线束外身体任何部位的剂量。
方法与材料
测量了6、10和23兆伏光子的泄漏辐射、从准直器、地面以及患者体内散射的辐射剂量。
结果
患者体内散射的辐射和从准直器散射的辐射对射野大小和距离有很强的依赖性，且仅在短距离时占主导。在较大距离时，泄漏辐射的贡献最大。通过适当的因素校正患者尺寸和射野形状后，精度优于±50%。
结论
对于能量高达23兆伏的光子，有可能计算原射线束外身体任何部位患者体内散射辐射的贡献。在较大距离时，这种贡献随能量增加。必须针对每台治疗机测量通过准直器泄漏的辐射以及从准直器散射的辐射。
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