摘要
热声成像是一种电磁场与声场相结合的多物理扬成像技术，其融合了电阻抗成像高对比度和热声成像高分辨率的优势，能实现对人体疾病的早期检测和诊断。本文主要研究注入电流式热声成像技术，描述了注入电流式热声成像的基础理论，推导了注入电流式热声成像利用电．热．声耦合的正逆问题，得到了电准静态近似下目标体所满足的方程和边界条件，采用时间反演法来处理注入电流式热声声压数据，进而重建目标体的声源，以低电导率仿体为成像目标体进行热声成像的仿真和实验研究，设计了注入电流式热声成像装置，以含盐凝胶仿体模型为实验的目标体，进行声信号的检测和声源的图像重建。结果表明重建的声源可反映目标体电导率分布情况，验证了该方法用于低电导率目标体电参数成像的可行性。
Thermoacoustic Imaging is multi-field coupling imaging technology that combines the electromagnetic field and sound field. Thermoacoustic Imaging is a medical functional imaging technology combining the advantages of high contrast of the electrical impedance tomography with the high spatial resolution of sonography, it can realize early detection and diagnosis of human diseases. Thermo-acoustic imaging with current injection（TAI-CI） was mainly studied in this paper, the principle of TAI-CI was studied, forward problem and inverse problem for TAI-CI basing electrical and thermal/acoustic coupling were derived, the equations and boundary conditions of target were obtained at electric quasi static approximation condition. The time reversal algorithm was used to process the detected signals and reconstruct the acoustic sources, simulation and experimental were carried out aiming at low conductivity phantom, an experiment set on TAI-CI was established to detect and collect the acoustic signals from the gel phantom, the acoustic source distribution of the gel phantom was reconstructed. Those revealed that TAI-CI can effectively reconstruct acoustic source images and reflect the conductivity distribution of the model. The results verified the feasibility of electrical parameter imaging using TAI-CI
出处
《现代科学仪器》
2017年第2期7-11,共5页
Modern Scientific Instruments
基金
国家自然科学基金（51477161）,国家自然科学基金（51407175）.
关键词
热声成像
声源重建
注入电流
低电导率
Thermo-acoustic imaging
Reconstruction of acoustic source
Current injection
low Conductivity
