Abstract
A method to enhance and modulate microwave-induced thermoacoustic imaging (MITAI) by applying ferromagnetic resonance (FMR) of Yttrium Iron Garnet (YIG) microparticles is proposed and experimentally demonstrated. Measured microwave heating effects and thermoacoustic signals of samples containing YIG particles under FMR imply that both the temperature rise and thermoacoustic signal strength are significantly enhanced as compared to the cases without FMR. Imaging results also corroborate validity of the modulation mechanism by testing a YIG sample and a sample with carbon nanotubes. This FMR enabled mechanism can serve as a modulation mechanism for MITAI and hold promise for differentiating different biological targets.
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