Design and Test Results of Superconducting Magnet for Heavy-Ion Rotating Gantry
Design and Test Results of Superconducting Magnet for Heavy-Ion Rotating Gantry
复制标题
重离子旋转龙门架超导磁体设计及试验结果
DOI：
10.1088/1742-6596/871/1/012083
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
N. Amemiya
中科院分区：
文献类型：
--
作者：
S. Takayama;K. Koyanagi;H. Miyazaki;S. Takami;T. Orikasa;Y. Ishii;T. Kurusu;Y. Iwata;K. Noda;T. Obana;K. Suzuki;T. Ogitsu;N. Amemiya
重离子放射治疗在肿瘤治疗中具有较高的疗效，也能减轻患者负担。这些优势已得到普遍认可。此外，旋转机架可以从任何方向向肿瘤照射离子，而不会改变患者的位置。这可以减少对正常细胞的物理剂量，因此通常用于质子放射治疗。然而，由于碳离子的高磁刚性，据我们估计，用于重离子治疗的旋转门架的重量大约是用于质子癌症治疗的旋转门架的三倍。为了解决这个问题，我们与美国国家放射科学研究所(NIRS)合作开发了一种小型轻型旋转龙门。紧凑型旋转龙门由10个低温超导(LTS)磁体组成，这些磁体是从束流光学角度设计的。这些LTS磁体具有表面缠绕线圈结构，并提供偶极和四极磁场。磁体的最大偶极磁场和四极磁场分别为2.88T和9.3T/m。旋转龙门已安装在NIRS，光束调试正在进行中，以达到所需的光束质量。自2013年以来的三年里，在日本经济产业省(METI)和日本医学研究开发机构(AMED)支持的一个项目中，我们一直在开发高温超导(HTS)磁体，目的是进一步缩小旋转龙门的尺寸。为了发展高温超导磁体设计和制造的基础技术，研制了一种模型磁体。该模型磁体由24个马鞍形高温超导线圈组成，产生1.2T的磁场。在报告中，将报告这一研究的最新进展。
Heavy-ion radiotherapy has a high curative effect in cancer treatment and also can reduce the burden on patients. These advantages have been generally recognized. Furthermore, a rotating gantry can irradiate a tumor with ions from any direction without changing the position of the patient. This can reduce the physical dose on normal cells, and is thus commonly used in proton radiotherapy. However, because of the high magnetic rigidity of carbon ions, the weight of the rotating gantry for heavy-ion therapy is about three-times heavier than those used for proton cancer therapy, according to our estimation. To overcome this issue, we developed a small and lightweight rotating gantry in collaboration with the National Institute of Radiological Sciences (NIRS). The compact rotating gantry was composed of ten low-temperature superconducting (LTS) magnets that were designed from the viewpoint of beam optics. These LTS magnets have a surface-winding coil-structure and provide both dipole and quadrupole fields. The maximum dipole and quadrupole magnetic field of the magnets were 2.88 T and 9.3 T/m, respectively. The rotating gantry was installed at NIRS, and beam commissioning is in progress to achieve the required beam quality. In the three years since 2013, in a project supported by the Ministry of Economy, Trade and Industry (METI) and the Japan Agency for Medical Research and Development (AMED), we have been developing high-temperature superconducting (HTS) magnets with the aim of a further size reduction of the rotating gantry. To develop fundamental technologies for designing and fabricating HTS magnets, a model magnet was manufactured. The model magnet was composed of 24 saddle-shaped HTS coils and generated a magnetic field of 1.2 T. In the presentation, recent progress in this research will be reported.