磁声耦合成像声信号检测的实验研究

Experiment of Acoustic Signal Detection on Magnetoacoustic Tomography

对磁声耦合成像进行原理性验证实验研究。从不同的几何模型出发,分别建立了圆线圈、矩形线圈和三角形铜线圈模型作为成像目标,置于稳恒磁场中,同时对其施加正弦脉冲信号,用中心频率为1 MHz的声传感器检测铜线圈在磁声耦合作用下产生的声信号,在不同位置、不同角度检测产生的声信号并进行分析处理。实验结果表明,超声传感器采集的声信号能对应铜环线圈位置,在此基础上进一步完善实验方法,以磁声耦合的方式实现进一步的成像研究。

In this study,primary experiment was conducted to validate the principle of MAT-MI.Different geometrical models were designed corresponding to the models,phantoms of copper coil were manufactured with the shape of circle,rectangle,triangle,respectively.In the experiment,the phantoms were placed in a static magnetic field while microsecond sine pulse stimulations were imposed on the coils,and thus,acoustic responses signal was generated by magneto-acoustic effect,meanwhile acoustic signals were detected by the transducer with a central frequency of 1 MHz.Then,acoustic signal from different positions,different angle was detected and analyzed.The experiments show that the acoustic signal can reflect the conductivity boundaries of the sample.Furthermore,experiments may be designed to image the electric conductivity of the objects based on magneto-acoustic coupling effect.