超声热疗无创测温中AR模型方法应用研究  

Study of AR model in non-invasive temperature evaluation of ultrasound hyperthermia

作　　者：邱媛媛[1] 章东[1] 龚秀芬[1] 

机构地区：[1]南京大学声学研究所近代声学教育部重点实验室,南京210093

出　　处：《声学技术》2009年第3期245-248,共4页Technical Acoustics

基　　金：教育部新世纪人才计划资助项目(06-0450)

摘　　要：研究基于超声功率谱的无创测温技术中AR滤波器对测温精度的影响。模拟了正常肝组织在超声换能器辐照下的散射回波信号,通过对加热前后组织回波信号的功率谱分析,使用AR模型计算频移,并反演温度分布。结果表明,当AR阶次为83～84、窗长为454～460时所反演的组织温度值与在频域求解非线性KZK方程和Pennes方程所得理论结果的偏差较小,约0.08oC。The effect of AR model on the non-invasive temperature evaluation of ultrasound hyperthermia is studied. Simulation of the backscattered radio frequency （RF） signal of normal liver tissue irradiated by ultrasound transducer is performed, and the temperature is evaluated by calculating harmonic frequency shifts in the spectrum of RF signal before and after ultrasound exposure by using AR model-based method. Results demonstrate that the deviation of the evaluated temperature by this method from that by solving the non-linear KZK equation and Pennes equation can reach 0.08℃ when AR model is about 83-84 order and window size is about 454-460.

关 键 词：超声热疗 无创测温 谐波频移 AR模型 

分 类 号：TB556[理学—物理]