Magneto-Acousto-Electrical Tomography with Magnetic Induction Based on Laser-Generated Ultrasound Transducer

The electrical characteristics of biological tissue are of great value to the basic research of life science and early diagnosis of major diseases. Magneto-acousto-electrical tomography, as the forefront of medical imaging, can quantitatively measure the electrical conductivities of tissue. However, the existing magneto-acousto-electrical tomography methods use non-focused piezoelectric ultrasonic transducer excitation, resulting in limited imaging resolution and detection sensitivity. Also, the electrical excitation brings the electromagnetic interference problem. This paper presents a new method of magneto-acousto-electrical tomography with magnetic induction based on laser-generated ultrasound (LGUS) transducer. Firstly, the design method of LGUS transducer made by candle smoke is studied, and then its performance is characterized and tested. Finally, the experimental of magneto-acousto-electrical tomography based on LGUS transducer is performed and realized two-dimensional B scan image of the single layer copper model. The experimental research shows that, as a new type of transducer, the LGUS transducer will be widely used in the field of magnetic-acousto-electrical tomography and other high frequency ultrasonic imaging.