Principle and Performance of Magnetically Induced Magnetoacoustic Tomography for Tissues with Cone Shaped Transducer

The theory on the principle of the Magnetically Induced Magnetoacoustic Tomography (MI-MAT) with a cone shaped transducer in cylindrical measure configuration is proposed in this paper. The principle of MI-MAT generation and magnetoacoustic detection are theoretically deduced in formula. It is proved that the acoustic waveforms are mainly generated at the conductivity boundaries and only the configuration of the scanned layer can be reconstructed without the inner conductivity distribution using the waveforms detected around the object with the cone shaped transducer. The performance of MI-MAT, including the improved resolution at high frequency excitation and the favorable SNR dependence, provides a noninvasive means for conductivity differentiation in diagnostic imaging. The numerical simulations of the proposed theory for a cylindrical sample phantom have good agreements with the former published results and suggest the potential applications for bioimpedance imaging.