Study on Imaging with Current Exciting Conductivity Model Based on Magnetoacoustic Effect

Magnetoacoustic imaging with electrical exciting is a newly proposed imaging approach to conduct noninvasive electrical conductivity imaging of biological tissue.In this paper,the imaging method is studied using computer simulation and experiment.Objects of metal coils was placed in a static magnetic field.Microsecond sine pulse stimulations were imposed on the objects and the acoustic responses generated by magnetoacoustic effect were detected and analyzed.The finite element method was applied in magnetoacoustic forward simulation,while an experimental device was established to measure the acoustic signal from the conductivity models.The conductivity boundary image was reconstructed from the measured data.Simulation results showed that the distribution of the acoustic source could reflect the sharp change of conductivity produced by the boundary of the objects.Results of the simulation and experiment were in a good agreement,and the resolution of the reconstructed images was less than 1 cm.Our investigation proves the feasibility of the electrical exciting magnetoacoustic imaging method to reflect the conductivity information,providing a foundation of further study on tissues with complex conductivity distribution.