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毫米级铁磁合金热籽在强交变磁场下由于涡流效应会高效产热,基于此原理研制的大型磁感应治疗系统已被用于肿瘤热疗临床实验。为指导热籽植入计划的设计和磁感应热疗计划系统温度场的仿真,该文介绍了平行、垂直及任意角度下圆柱状植入热籽产热功率的理论计算公式;然后通过曲线拟合对计算公式进行了简化,为热疗计划系统温度场仿真提供了便于编程实现的计算模型;最后,通过单颗Ni-Cu合金热籽空气中加热实验验证了计算公式的准确性。
The millimeter-scale ferromagnetic alloy hot seeds can efficiently generate heat due to eddy current under a strong alternating magnetic field. Based on this principle, a large-scale magnetic induction treatment system has been used in clinical trials of tumor hyperthermia. In order to guide the design of the hot seed implantation plan and the simulation of the temperature field of the magnetic induction hyperthermia planning system, this paper introduces the theoretical calculation formula of the heat production power of the cylindrical seed implantation under the parallel, vertical and arbitrary angles. Then, The calculation formula is simplified, which provides a computational model for the simulation of temperature field in hyperthermia planning system. Finally, the calculation accuracy of the calculation formula is verified by the heating experiment in a single Ni-Cu alloy hot-seed air.