In order to detect early malignant tumors, this experiment proposed a magnetoacoustics imaging method based on low-frequency magnetic excitation and active ultrasonic detection, and introduced color Doppler imaging technology to detect tissue vibration caused by Lorentz force. Active detection can use low-frequency signals as excitation, which greatly improves the energy conversion rate.

First, we prepare a signal generator, SLA-100-810 power amplifier, ultrasonic probe, Helmholtz coil, data acquisition platform and other test equipment.

An arbitrary waveform generator is used to generate an excitation signal, which is amplified by a power amplifier and then input into the coil to generate an excitation magnetic field. At the same time, put the phantom into the exciting magnetic field, and add a static magnetic field in the same direction outside the exciting magnetic field. Under the action of the exciting magnetic field, induced eddy currents will be generated at the borders of regions with different conductivity in the phantom, and the induced eddy currents will be further affected by the Lorentz force in the static magnetic field, thereby driving the surrounding tissues to vibrate.

Next, we will make the experimental phantom combined with the experimental phantom and the retrograde excitation shear wave experiment.

Figure 1 Velocity variation curves at different points of the blank phantom velocity diagram.

Figure 2 Velocity curves of different points of the copper-embedded phantom as a function of time.

Combining the experimental results of the copper-embedded phantom and the blank phantom in the new magnetoacoustics platform, the simulation results are further verified, and the process of shear wave transmission in the simulation results is observed, which requires our experimental platform to provide a stronger magnetic field The signal, the speed and shape information during the shear wave transmission process will also help us to further reconstruct the tissue conductivity distribution or tissue elasticity distribution.

It can be found that SLA-100-810 power amplifier has amplified the signal in this experiment and generated the excitation magnetic field in the input coil.