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Focused ultrasound modulates region-specific brain activity
Seung-Schik Yoo1, Alexander Bystritsky, Jong-Hwan Lee
1Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA. yoo@bwh.harvard.edu
Neuroimage
|March 1, 2011
Summary
Focused ultrasound (FUS) can safely and temporarily alter brain activity in rabbits, offering precise modulation of specific brain regions. This non-invasive technique shows promise for advancing brain research and developing new therapies.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Medical Imaging
Background:
- Non-invasive brain modulation techniques are crucial for understanding brain function.
- Existing methods like transcranial magnetic stimulation have limitations in targeting deep brain structures.
- Focused ultrasound (FUS) presents a potential alternative for precise, non-invasive neuromodulation.
Purpose of the Study:
- To demonstrate the in vivo feasibility of using focused ultrasound (FUS) for transient brain function modulation.
- To investigate the safety and efficacy of low-energy FUS in targeting specific brain regions.
- To explore the potential of FUS for both stimulating and suppressing neural activity.
Main Methods:
- Focused ultrasound (FUS) was applied to the somatomotor and visual areas of rabbit brains.
- Image guidance using magnetic resonance imaging (MRI) ensured precise targeting.
- Electrophysiological recordings and functional MRI (fMRI) were used to characterize brain activity changes.
- Histological analysis assessed tissue damage post-sonication.
Main Results:
- FUS successfully modulated regional brain function in vivo, with both stimulatory and suppressive effects observed.
- Modulation occurred at low acoustic energy, below the cavitation threshold, indicating a safe application.
- Histological examination confirmed no discernible tissue damage after FUS application.
- FUS demonstrated greater spatial precision compared to transcranial magnetic stimulation, especially for deep brain structures.
Conclusions:
- Image-guided, anatomically-targeted FUS is a feasible method for transiently modulating brain function in vivo.
- FUS offers a non-invasive, precise tool for investigating functional connectivity and localized brain functions.
- This technology holds significant potential for advancing neuroscience research and developing novel therapeutic interventions for neurological and psychiatric disorders.
