Design of a superconducting rotating gantry for heavy-ion therapy
Design of a superconducting rotating gantry for heavy-ion therapy
复制标题
DOI：
10.1103/physrevstab.15.044701
复制
发表时间：
2012-04-10
影响因子：
--
通讯作者：
Watanabe, I.
中科院分区：
文献类型：
--
作者：
Iwata, Y.;Noda, K.;Watanabe, I.
正在设计一种用于重离子治疗的超导旋转机架。该等中心旋转机架可将最大能量为430 MeV/u的重离子输送到等中心，照射角度超过0-360度，并能够进行三维光栅扫描照射。组合功能超导磁体将用于旋转机架。具有优化的束光学器件的超导磁体允许紧凑的机架设计，在等中心处具有大的扫描尺寸;机架的长度和半径分别约为13和5.5米，与现有的质子机架相当。此外，在等中心的最大扫描尺寸计算为大约200平方毫米的重离子束在430 MeV/u的最大能量。在束流光学系统设计的基础上，确定了超导磁体的性能指标。超导磁体和磁场分布的设计使用三维场求解器。利用计算得到的磁场，进行了束流跟踪模拟，以验证超导磁体的设计，并同时评估磁场质量。通过计算等中心点处的束流分布，我们发现束斑的位置以及它们的大小和形状可以很好地再现设计，证明了我们设计的有效性。
A superconducting rotating gantry for heavy-ion therapy is being designed. This isocentric rotating gantry can transport heavy ions with the maximum energy of 430 MeV/u to an isocenter with irradiation angles of over 0-360 degrees, and is further capable of performing three-dimensional raster-scanning irradiation. The combined-function superconducting magnets will be employed for the rotating gantry. The superconducting magnets with optimized beam optics allow a compact gantry design with a large scan size at the isocenter; the length and the radius of the gantry will be approximately 13 and 5.5 m, respectively, which are comparable to those for the existing proton gantries. Furthermore, the maximum scan size at the isocenter is calculated to be as large as approximately 200 mm square for heavy-ion beams at the maximum energy of 430 MeV/u. Based on the design of the beam optics, specifications of the superconducting magnets were determined. The superconducting magnets and magnetic-field distributions are designed using a three-dimensional field solver. With the calculated magnetic fields, beam-tracking simulations were performed to verify the design of the superconducting magnets, and concurrently to evaluate the field quality. With calculated beam profiles at the isocenter, we found that the positions of beam spots as well as their size and shape could be well reproduced as designed, proving validity of our design.