热疗用金属热籽对放疗剂量的影响

目的 研究磁感应热疗所用于体内的金属热籽在植入机体后对放疗剂量分布产生的影响.方法 使用放疗人体仿真模型及三维治疗计划系统,通过模拟照射评估用于磁感应热疗的金属植入物处于放疗条件下对剂量分布的影响.结果 所植入的金属棒热籽材料对人体仿真组织的吸收剂量影响≤1.5%.结论 由于在组织中所植入的铁磁热籽对吸收剂量的影响很小,符合靶区剂量总不确定度<5%的要求,因此,在临床放疗处理中可以忽略不考虑其对组织的影响.

Impact of metal thermoseeds on radiation dose distribution

Objective To study the impact of implanted thermoseeds of magnetic induction hyperthermia on radiation dose distribution. Methods To simulate irradiation, an anthropomorphic phantom and three-dimensional treatment planning system were used. The impact of thermoseeds on radiation dose distribution was evaluated. Results The change of absorbed dose caused by the implantated thermoseeds was less than 1.5%. Conclusions The impact of implanted thermoseeds on radiation dose distribution is small and comes up to the requirements that the total target dose uncertainty must be less than 5%. Therefore, the impact of thermoseeds on the absorbed dose in tissue can be ignored in clinical practice.