Physical and dosimetric aspects of a multileaf collimation system used in the dynamic mode for implementing intensity modulated radiotherapy
Physical and dosimetric aspects of a multileaf collimation system used in the dynamic mode for implementing intensity modulated radiotherapy
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DOI：
10.1118/1.598381
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发表时间：
1998-10-01
期刊：
影响因子：
3.8
通讯作者：
Ling, CC
中科院分区：
文献类型：
--
作者：
LoSasso, T;Chui, CS;Ling, CC
在动态模式下使用多叶准直器进行调强放射治疗在1995年在我们的机构成为现实。与使用多叶准直器的静态场治疗不同，在实施动态治疗之前必须评估显著的剂量测定问题。我们已经进行了一系列的计算和测量，以量化头部散射的小领域，准直器传输，并通过圆形叶端的传输。如果不考虑这些因素，对于典型计划，这些因素会影响前列腺的输送剂量5%-20%。用离子室和射线照相胶片获得的数据为6和15 MV的X射线束。多叶准直器的机械精度，在叶位置校准期间实现和剂量输送期间保持的输送剂量的影响，也进行了讨论。(C)1998年美国医学物理学家协会。[S0094-2405（98）02510-3]。
The use of a multileaf collimator in the dynamic mode to perform intensity modulated radiotherapy became a reality at our institution in 1995. Unlike treatment with static fields using a multileaf collimator, there are significant dosimetric issues which must be assessed before dynamic therapy can be implemented. We have performed a series of calculations and measurements to quantify head scatter for small fields, collimator transmission, and the transmission through rounded leaf ends. If not accounted for, these factors affect the delivered dose to the prostate by 5%-20% for a typical plan. Data obtained with ion chambers and radiographic film are presented for both 6 and 15 MV x-ray beams. The impact on the delivered dose of the mechanical accuracy of the multileaf collimator, achieved during leaf position calibration and maintained during dose delivery, is also discussed. (C) 1998 American Association of Physicists in Medicine. [S0094-2405(98)02510-3].