Effects of transcranial focused ultrasound on human primary motor cortex using 7T fMRI: a pilot study.

Abstract:

BACKGROUND:Transcranial focused ultrasound (tFUS) is a new non-invasive neuromodulation technique that uses mechanical energy to modulate neuronal excitability with high spatial precision. tFUS has been shown to be capable of modulating EEG brain activity in humans that is spatially restricted, and here, we use 7T MRI to extend these findings. We test the effect of tFUS on 7T BOLD fMRI signals from individual finger representations in the human primary motor cortex (M1) and connected cortical motor regions. Participants (N = 5) performed a cued finger tapping task in a 7T MRI scanner with their thumb, index, and middle fingers to produce a BOLD signal for individual M1 finger representations during either tFUS or sham neuromodulation to the thumb representation. RESULTS:Results demonstrated a statistically significant increase in activation volume of the M1 thumb representation for the tFUS condition as compared to sham. No differences in percent BOLD changes were found. This effect was spatially confined as the index and middle finger M1 finger representations did not show similar significant changes in either percent change or activation volume. No effects were seen during tFUS to M1 in the supplementary motor area or the dorsal premotor cortex. CONCLUSIONS:Single element tFUS can be paired with high field MRI that does not induce significant artifact. tFUS increases activation volumes of the targeted finger representation that is spatially restricted within M1 but does not extend to functionally connected motor regions. Trial registration ClinicalTrials.gov NCT03634631 08/14/18.

journal_name

BMC Neurosci

journal_title

BMC neuroscience

authors

Ai L,Bansal P,Mueller JK,Legon W

doi

10.1186/s12868-018-0456-6

subject

Has Abstract

pub_date

2018-09-14 00:00:00

pages

56

issue

1

issn

1471-2202

pii

10.1186/s12868-018-0456-6

journal_volume

19

pub_type

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