A pencil beam algorithm for proton dose calculations
A pencil beam algorithm for proton dose calculations
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DOI：
10.1088/0031-9155/41/8/005
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发表时间：
1996-08-01
影响因子：
3.5
通讯作者：
Urie, M
中科院分区：
文献类型：
--
作者：
Hong, L;Goitein, M;Urie, M
尖锐的侧向半影和质子束范围末端的剂量快速下降是质子放射治疗的主要优点之一。这些射束特性取决于上游射束修改装置（诸如孔径和补偿团）的位置和特性。分离的程度，如果有的话，这些束修改设备和病人之间是特别关键的，在这方面，我们已经开发出一种笔形束质子剂量计算算法，它需要准确考虑上游的病人和他们之间的空气间隙的材料的影响和病人。该模型包括一个新的方法来挑选的笔形波束的位置，以便更准确地模拟半影，并更有效地考虑到多个散射点周围的媒体的影响。我们还提出了一个更快的宽波束版本的算法，它给出了一个相当准确的半影。预测的算法和实验结果进行了大场质子束。一般来说，该算法与测量结果吻合良好。
The sharp lateral penumbra and the rapid fall-off of dose at the end of range of a proton beam are among the major advantages of proton radiation therapy. These beam characteristics depend on the position and characteristics of upstream beam-modifying devices such as apertures and compensating boluses. The extent of separation, if any, between these beam-modifying devices and the patient is particularly critical in this respect.We have developed a pencil beam algorithm for proton dose calculations which takes accurate account of the effects of materials upstream of the patient and of the air gap between them and the patient. The model includes a new approach to picking the locations of the pencil beams so as to more accurately model the penumbra and to more effectively account for the multiple-scattering effects of the media around the point of interest. We also present a faster broad-beam version of the algorithm which gives a reasonably accurate penumbra. Predictions of the algorithm and results from experiments performed in a large-field proton beam are presented. In general the algorithm agrees well with the measurements.