Difference frequency magnetoacoustic tomography without static magnetic field

Difference frequency magnetoacoustic tomography (DF-MAT) without a static magnetic field is theoretically investigated and demonstrated in a phantom study. For the alternating transient magnetic stimulation of a biological tissue, two large transient alternating currents with two different frequencies of 10 and 9 MHz are applied to two resonance coils. Instead of the static magnetic field in the conventional magnetoacoustic tomography with magnetic induction (MAT-MI), the Lorenz force is generated by the induced magnetic field and current in DF-MAT. Because of the nonlinear effect, the difference frequency of 1 MHz is suitable for reconstructing the ultrasonic source.

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