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Journal of Biomedical Optics

Blood flow and oxygenation changes due to low-frequency repetitive transcranial magnetic stimulation of the cerebral cortex
Author(s): Rickson C. Mesquita; Olufunsho K. Faseyitan; Peter E. Turkeltaub; Erin M. Buckley; Amy Thomas; Meeri N. Kim; Turgut Durduran; Joel H. Greenberg; John A. Detre; Arjun G. Yodh; Roy H. Hamilton
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Paper Abstract

Transcranial magnetic stimulation (TMS) modulates processing in the human brain and is therefore of interest as a treatment modality for neurologic conditions. During TMS administration, an electric current passing through a coil on the scalp creates a rapidly varying magnetic field that induces currents in the cerebral cortex. The effects of low-frequency (1 Hz), repetitive TMS (rTMS ) on motor cortex cerebral blood flow (CBF) and tissue oxygenation in seven healthy adults, during/after 20 min stimulation, is reported. Noninvasive optical methods are employed: diffuse correlation spectroscopy (DCS) for blood flow and diffuse optical spectroscopy (DOS) for hemoglobin concentrations. A significant increase in median CBF (33%) on the side ipsilateral to stimulation was observed during rTMS and persisted after discontinuation. The measured hemodynamic parameter variations enabled computation of relative changes in cerebral metabolic rate of oxygen consumption during rTMS , which increased significantly (28%) in the stimulated hemisphere. By contrast, hemodynamic changes from baseline were not observed contralateral to rTMS administration (all parameters, p<0.29 ). In total, these findings provide new information about hemodynamic/metabolic responses to low-frequency rTMS and, importantly, demonstrate the feasibility of DCS/DOS for noninvasive monitoring of TMS-induced physiologic effects.

Paper Details

Date Published: 11 June 2013
PDF: 12 pages
J. Biomed. Opt. 18(6) 067006 doi: 10.1117/1.JBO.18.6.067006
Published in: Journal of Biomedical Optics Volume 18, Issue 6
Show Author Affiliations
Rickson C. Mesquita, Univ. of Pennsylvania (United States)
Olufunsho K. Faseyitan, Univ. of Pennsylvania (United States)
Peter E. Turkeltaub, Georgetown Univ. Medical Ctr. (United States)
Erin M. Buckley, Univ. of Pennsylvania (United States)
Amy Thomas, Univ. of Pennsylvania (United States)
Meeri N. Kim, Univ. of Pennsylvania (United States)
Turgut Durduran, ICFO - Institut de Ciències Fotòniques (Spain)
Joel H. Greenberg, The Univ. of Pennsylvania Health System (United States)
John A. Detre, The Univ. of Pennsylvania Health System (United States)
Arjun G. Yodh, Univ. of Pennsylvania (United States)
Roy H. Hamilton, Univ. of Pennsylvania (United States)

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