Magnetic Induction Magnetoacoustic Tomography Scan Imaging Studies

Magnetoacoustic tomography with magnetic induction (MAT-MI) is a recently proposed modality for electrical impedance imaging of biological tissues, in which, under a static magnetic field and a pulsed time-varying magnetic field, the conductive target object emits acoustic signals because of the acoustic vibration of the Lorentz force and the collected acoustic signal comprising the conductivity information of the target can be used to reconstruct the conductivity distribution. Compared with the other electrical impedance imaging technologies, MAT-MI methodology shows the advantage of avoiding the "shielding effect" caused by the low-conductivity surface tissue layers of the human body by employing the magnetic excitation. Furthermore, high spatial resolution could be achieved in MAT-MI with high frequency magnetic excitation and acoustic detection. This thesis based on the theoretic of magnetic field and sound field carried on the research on forward and backward problems of Magnetoacoustic tomography with magnetic induction (MAT-MI). We present a novel methodology for the inverse problem solution of the2-D Lorentz force distribution reconstruction based on the acoustic straight line propagation theory and proposed an acoustic dipole radiation model for magnetoacoustic tomography with magnetic induction (MAT-MI), The numerical simulation is performed for a two-layer cylindrical phantom model and it is also verified by the experimental results of MAT-MI for a tissue-like sample phantom. We also advanced the theory of time reversal which to resolve the reverse problem of magnetoacoustic tomography with magnetic induction (MAT-MI).