重离子治癌终端的束流强度及剂量监测系统

Beam intensity and dose monitor system for heavy-ion tumor therapy

摘要: 为实现重离子肿瘤治疗临床实验中对照射束流状态的实时监测，研制了束流强度及剂量监测系统，包括积分电离室、后续电流频率转换电路及LabVIEW数据获取处理三部分。利用闪烁体探测器和标准剂量计测试了系统的线性响应和得到剂量的准确性，结果表明：系统在束流临床照射流强范围内的线性响应好于90%，其实时反馈的临床照射剂量偏差小于5%。同时束流强度及剂量监测系统与安全控制系统相结合，保证束流照射状态满足临床照射的安全要求。

Abstract: The clinical trials of tumor therapy using heavy ion beams, supplied by the cooler storage ring of the Heavy Ion Research Facility in Lanzhou (HIRFL-CSR) with the energy of 100 to 450 MeV/u, are now in progress at the Institute of Modern Physics in Lanzhou. A beam intensity and dose monitor system has been developed to real-time monitor the irradiation dose and beam intensity stability and to make sure the safety of the patients. It is composed of integral ionization chamber, current-frequency transfer electric board and LabVIEW data acquiring and analyzing system. The measurements of this system show that it can work well under the clinical condition.