腔道肿瘤热疗辐射器在组织体模中三维热场分布的空间点阵测量法研究

STUDY ON THE METHOD FOR PRECISELY AND QUICKLY MEASURING 3D SAR OF INTRACAVITY HY-PERTHERMIC APPLICATORS IN PHANTOM WITH INSERTING AN ARRAY DEVICE OF SINGLE MULTI-SENSOR NEEDLES

热场分布是检验热疗辐射器优劣的主要判据，而目前商品机多不给定量热场图，使用时有较大盲目性。因此，研究热场分布测量方法具有重要的实际意义。本文分析了热疗辐射器对活体组织和等效体模加热的温升规律。指出要获得较佳的治疗效果，辐射器必须有较好的ＳＡＲ热场分布特性。本文提出用空间点阵法快速获得组织体模内ＳＡＲ三维热场分布，介绍了其测量原理和数据处理方法及用于该方法的单针多点测温探针原理和多点测温探针组排及装置；最后以腔道（宫颈）微波热疗辐射器为例给出了用空间点阵法测量其在等效肌肉体模中三维热场分布的实验结果。本文所用测量方法较之目前国外使用的“分开体模兼热象二维测定法”和“体模内埋设空心塑料管法”有无需打开体模、测量迅速及有较好测温精度（±０．２℃）与空间分辨率（２ｍｍ），尤其是可得到三维热场分布图像等优点。该方法和装置已用于研制具有优质热场的腔道辐射器，并在肿瘤热疗中优选辐射器和治疗方案实践获得较好效果。

It’s well known that,Checking the 3DS-AR distribution of hyperthermic ap-plicators is very important for hyperthermia,In the present paper,we developed aspacing senser array device outside phantom,which is consisted by a group of single multi-sensor needles,and used to measure the 3D-SAR distribution of in-tracavity applicators very quickly,The measurement principle and data process ing method are discribed.We had used this method to get and improve the 3D SAR patterns of various intracavity applicators,The advantages of this method are as follows:shorter measuring time,no-need to open the phantom, better temperature accuracy and space resolution,especially,it can get the 3DSAR image.