Real-time microwave imaging of differential temperature for thermal therapy monitoring.
Real-time microwave imaging of differential temperature for thermal therapy monitoring.
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DOI：
10.1109/tbme.2014.2307072
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发表时间：
2014-06
期刊：
影响因子：
--
通讯作者：
Moghaddam M
中科院分区：
文献类型：
--
作者：
Haynes M;Stang J;Moghaddam M
研制了一种用于热疗系统实时三维差温成像的微波成像系统。设计参数受限于用于乳房的原型聚焦微波热治疗系统的特点，工作频率为915 MHz。实时成像是通过预先计算的线性逆散射解决方案结合连续矢量网络分析仪（VNA）测量36天线，HFSS模型，圆柱形腔。以每秒1帧的刷新率和1°C的分辨率形成介电常数随温度的微分变化的体积图像。开发了数据分割和后处理s参数误差校正程序。采用空腔作为未知通过标准，加快了天线对VNA的校准速度。该装置在水中目标和一个简单的乳房模型上进行了测试。差分加热目标在杂乱环境中成功成像。散射对比幅度的变化率与目标温度成1:1的相关关系。
A microwave imaging system for real-time 3D imaging of differential temperature has been developed for the monitoring and feedback of thermal therapy systems. Design parameters are constrained by features of a prototype focused microwave thermal therapy system for the breast, operating at 915 MHz. Real-time imaging is accomplished with a precomputed linear inverse scattering solution combined with continuous Vector Network Analyzer (VNA) measurements of a 36-antenna, HFSS modeled, cylindrical cavity. Volumetric images of differential change of dielectric constant due to temperature are formed with a refresh rate as fast as 1 frame per second and 1°C resolution. Procedures for data segmentation and post-processed S-parameter error-correction are developed. Antenna pair VNA calibration is accelerated by using the cavity as the unknown thru standard. The device is tested on water targets and a simple breast phantom. Differentially heated targets are successfully imaged in cluttered environments. The rate of change of scattering contrast magnitude correlates 1:1 with target temperature.