摘要
磁声成像(MAT)技术具有高灵敏度、高空间分辨率的优点,其声源产生机制是正、逆问题的研究基础。本文分别采用点源、偶极子源辐射理论对实验条件下产生的声信号进行了仿真,探讨了它们的声压信号差异,并开展了物理实验进行对照和验证。实验结果显示MAT的声波具有一定的方向性,表明偶极子声源模型比点声源模型更接近于实际情况。本研究对于MAT算法的精确化具有重要意义。
Magnetoacoustic tomography （MAT） has some advantages such as high sensitivity and high spatial resolution. The generating mechanism of acoustic source is the research foundation of forward and inverse problems. Acoustic signals were respectively simulated by using monopole and dipole radiation theory in the experimental conditions, then the differences between their acoustic pressures were discussed, and furthermore the contrast and validation were conducted by physical experiments in this study. The physical experimental results showed that acoustic waveform of MAT had a certain directivity and therefore they indicated that dipole model showed higher approximation to the real facts than monopole model. It can be well concluded that this research has cardinal significance for the accurate algorithm of MAT.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2014年第1期91-96,共6页
Journal of Biomedical Engineering
关键词
磁声成像
声源
声偶极子
magenetoacoustic tomography
acoustic source
acoustic dipole
