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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Focused ultrasound neuromodulation of cortical and subcortical brain structures using 1.9 MHz

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Kamimura, Hermes A. S. ; Wang, Shutao ; Chen, Hong ; Wang, Qi ; Aurup, Christian ; Acosta, Camilo ; Carneiro, Antonio A. O. ; Konofagou, Elisa E.
Total Authors: 8
Document type: Journal article
Source: Medical Physics; v. 43, n. 10 OCT 2016.
Web of Science Citations: 23

Purpose: Ultrasound neuromodulation is a promising noninvasive technique for controlling neural activity. Previous small animal studies suffered from low targeting specificity because of the low ultrasound frequencies (<690 kHz) used. In this study, the authors demonstrated the capability of focused ultrasound (FUS) neuromodulation in the megahertz-range to achieve superior targeting specificity in the murine brain as well as demonstrate modulation of both motor and sensory responses. Methods: FUS sonications were carried out at 1.9 MHz with 50% duty cycle, pulse repetition frequency of 1 kHz, and duration of 1 s. The robustness of the FUS neuromodulation was assessed first in sensorimotor cortex, where elicited motor activities were observed and recorded on videos and electromyography. Deeper brain regions were then targeted where pupillary dilation served as an indicative of successful modulation of subcortical brain structures. Results: Contralateral and ipsilateral movements of the hind limbs were repeatedly observed when the FUS was targeted at the sensorimotor cortex. Induced trunk and tail movements were also observed at different coordinates inside the sensorimotor cortex. At deeper targeted-structures, FUS induced eyeball movements (superior colliculus) and pupillary dilation (pretectal nucleus, locus coeruleus, and hippocampus). Histological analysis revealed no tissue damage associated with the FUS sonications. Conclusions: The motor movements and pupillary dilation observed in this study demonstrate the capability of FUS to modulate cortical and subcortical brain structures without inducing any damage. The variety of responses observed here demonstrates the capability of FUS to perform functional brain mapping. (C) 2016 American Association of Physicists in Medicine. (AU)

FAPESP's process: 11/10809-6 - Sonothrombolysis by focused and modulated acoustic radiation force using double beam
Grantee:Hermes Arytto Salles Kamimura
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/08116-8 - Acoustic power delivery of the multi-frequency ultrasound excitation for the treatment of acute ischemic stroke and its thermal effects and efficiency with microbubbles
Grantee:Hermes Arytto Salles Kamimura
Support type: Scholarships abroad - Research Internship - Doctorate