深层治癌重离子束的配送

The delivery system of hadron therapy at Institute of Modern Physics

利用重离子束流治疗深层肿瘤的临床实验将在中国科学院近代物理研究所(IMP)进行。束流配送系统是重离子治癌临床实验的关键系统,输送束流均匀辐照照射野。重离子束流经过回旋加速器初步加速,注入重离子冷却储存环(CSR)的主环(CSRm),累积、加速后通过共振引出,经深层治癌束运线输送到照射野。针对重离子治癌要求和现场可利用空间,优化设计了束运线,得到了灵活调节束斑尺寸的透镜参数。通过模拟束流扫描过程,验证了扫描系统的可行性。

The hadron therapy system at Institute of Modem Physics will provide carbon ion beams for clinical treatment of in-depth tumors. The beam delivery system, which is used to transfer the beam to irradiation fields, is critical for the heavy ion cancer clinical trials. The tumor is uniformly irradiated. Primarily accelerated by the cyclotron, the heavy ion beam pours into the cooler storage ring main （CSRm） for accumulation and acceleration. The ion beam is extracted by resonance, before the beam is transferred to the tumor through the transfer line. Based on the medical requirements and technical specifications to design and optimize the transfer line, a set of lens parameters is adopted to flexibly adjust the beam spot size. The feasibility of a scanning system is verified by simulating the beam scanning process.