An integrated 6 MV linear accelerator model from electron gun to dose in a water tank.
An integrated 6 MV linear accelerator model from electron gun to dose in a water tank.
复制标题
从电子枪到水箱剂量的集成 6 MV 直线加速器模型。
DOI：
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
B. Fallone
中科院分区：
文献类型：
--
作者：
J. St Aubin;S. Steciw;C. Kirkby;B. Fallone
目的
详细介绍了一台直列式侧面耦合6 MV直线加速器从电子枪到靶的全模拟。通过使用在靶处导出的电子相空间作为水箱内剂量分布的蒙特卡罗研究的输入并将模拟结果与测量数据相匹配来执行上述模拟的调试。这项工作的动机是由直线加速器MR研究，其中一个经过验证的完整的直线加速器的模拟是第一次需要为了执行未来的研究直线加速器的性能在外部磁场的存在。
方法
利用二维有限差分程序，利用Child定律对电子枪进行了初步设计和优化。电子枪模拟作为输入到6 MV直线加速器波导模拟，其中包括一个三维有限元射频场的解决方案内的波导和电子轨迹确定从粒子动力学建模。电子枪的设计被限制为与Varian 600 C的阴极电势和电子枪电流相匹配，而直线加速器波导被优化为与测量的靶电流相匹配。通过将水箱中的模拟蒙特卡罗剂量分布与测量分布相匹配，进行了完整模拟的调试。
结果
完整的直线加速器模拟匹配所有的电气测量从瓦里安600 C和调试过程导致在剂量分布测量的优秀协议。对于所分析的所有射野尺寸，超过99%的所有点均符合1%/1 mm验收标准，但最大40 x 40 cm 2射野除外，其中98%的所有点均符合1%/1 mm验收标准，并且深度剂量曲线与测量值匹配，深度在1.5 cm深度以下1%以内。优化的能量和空间强度分布，由调试过程中给出的，被确定为非高斯形式的内联侧耦合6 MV直线加速器模拟。
结论
内联侧耦合6 MV直线加速器的集成模拟已经完成，并进行了基准测试，使所有电气和剂量测量均达到高精度。结果表明，非高斯空间强度和能量分布的直线加速器建模。
PURPOSE
The details of a full simulation of an inline side-coupled 6 MV linear accelerator (linac) from the electron gun to the target are presented. Commissioning of the above simulation was performed by using the derived electron phase space at the target as an input into Monte Carlo studies of dose distributions within a water tank and matching the simulation results to measurement data. This work is motivated by linac-MR studies, where a validated full linac simulation is first required in order to perform future studies on linac performance in the presence of an external magnetic field.
METHODS
An electron gun was initially designed and optimized with a 2D finite difference program using Child's law. The electron gun simulation served as an input to a 6 MV linac waveguide simulation, which consisted of a 3D finite element radio-frequency field solution within the waveguide and electron trajectories determined from particle dynamics modeling. The electron gun design was constrained to match the cathode potential and electron gun current of a Varian 600C, while the linac waveguide was optimized to match the measured target current. Commissioning of the full simulation was performed by matching the simulated Monte Carlo dose distributions in a water tank to measured distributions.
RESULTS
The full linac simulation matched all the electrical measurements taken from a Varian 600C and the commissioning process lead to excellent agreements in the dose profile measurements. Greater than 99% of all points met a 1%/1mm acceptance criterion for all field sizes analyzed, with the exception of the largest 40 x 40 cm2 field for which 98% of all points met the 1%/1mm acceptance criterion and the depth dose curves matched measurement to within 1% deeper than 1.5 cm depth. The optimized energy and spatial intensity distributions, as given by the commissioning process, were determined to be non-Gaussian in form for the inline side-coupled 6 MV linac simulated.
CONCLUSIONS
An integrated simulation of an inline side-coupled 6 MV linac has been completed and benchmarked matching all electrical and dosimetric measurements to high accuracy. The results showed non-Gaussian spatial intensity and energy distributions for the linac modeled.
影响因子：
3.8
作者：
ROGERS, DWO;FADDEGON, BA;MACKIE, TR
通讯作者：
MACKIE, TR