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Related Experiment Video

Updated: Sep 6, 2025

Deep Brain Stimulation with Simultaneous fMRI in Rodents
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A Noninvasive Deep Brain Stimulation Method via Temporal-Spatial Interference Magneto-Acoustic Effect: Simulation and

Ruixu Liu, Ren Ma, Xu Liu

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |July 1, 2022
    PubMed
    Summary

    A new noninvasive deep brain stimulation method, temporal-spatial interference magneto-acoustic stimulation (TIMAS), precisely targets neural pathways. This technique offers superior penetration and resolution for neuropsychological disease research and treatment.

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    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Medical Physics

    Background:

    • Deep brain transcranial stimulation is crucial for neuropsychological disease research and treatment.
    • Current methods ideally require noninvasive and precisely controlled stimulation.
    • Existing transcranial magneto-acoustic stimulation (TMAS) has limitations in resolution and control.

    Purpose of the Study:

    • To introduce a novel noninvasive deep brain stimulation technique: temporal-spatial interference magneto-acoustic stimulation (TIMAS).
    • To combine transcranial magneto-acoustic stimulation (TMAS) and temporal interference stimulation (TIS) for enhanced neural stimulation.
    • To achieve precise, deep brain electrostimulation using modulated low-frequency oscillations.

    Main Methods:

    • Developed TIMAS by interfering ultrasonic waves at two frequencies to generate a modulated low-frequency signal.
    • Utilized the magneto-acoustic coupling effect for deep brain electrostimulation.
    • Experimental system achieved a focused electric field with a millimeter focal spot and high spatial resolution.

    Main Results:

    • Achieved a focused electric field with millimeter focal spot, 1.2 mm lateral resolution, and 6.4 mm axial resolution at 4.13 kHz.
    • Measured electric field intensity of 137.2 mV/m, meeting the threshold for effective nerve stimulation.
    • Demonstrated superior penetration, temporal-spatial resolution, and directional electric field generation compared to traditional TMAS.

    Conclusions:

    • TIMAS offers a new noninvasive approach for low-frequency envelope modulated electrical stimulation.
    • The method provides high spatial resolution and focus for deep brain stimulation.
    • TIMAS is a promising technique for brain science research and treating deep brain region-related neuropsychiatric diseases.