Test-retest assessment of cortical activation induced by repetitive transcranial magnetic stimulation with brain atlas-guided optical topography.


Journal Article

Repetitive transcranial magnetic stimulation (rTMS) is a technology that stimulates neurons with rapidly changing magnetic pulses with demonstrated therapeutic applications for various neuropsychiatric disorders. Functional near-infrared spectroscopy (fNIRS) is a suitable tool to assess rTMS-evoked brain responses without interference from the magnetic or electric fields generated by the TMS coil. We have previously reported a channel-wise study of combined rTMS/fNIRS on the motor and prefrontal cortices, showing a robust decrease of oxygenated hemoglobin concentration (Δ[HbO2]) at the sites of 1-Hz rTMS and the contralateral brain regions. However, the reliability of this putative clinical tool is unknown. In this study, we develop a rapid optical topography approach to spatially characterize the rTMS-evoked hemodynamic responses on a standard brain atlas. A hemispherical approximation of the brain is employed to convert the three-dimensional topography on the complex brain surface to a two-dimensional topography in the spherical coordinate system. The test-retest reliability of the combined rTMS/fNIRS is assessed using repeated measurements performed two to three days apart. The results demonstrate that the Δ[HbO2] amplitudes have moderate-to-high reliability at the group level; and the spatial patterns of the topographic images have high reproducibility in size and a moderate degree of overlap at the individual level.

Full Text

Duke Authors

Cited Authors

  • Tian, F; Kozel, FA; Yennu, A; Croarkin, PE; McClintock, SM; Mapes, KS; Husain, MM; Liu, H

Published Date

  • November 2012

Published In

Volume / Issue

  • 17 / 11

Start / End Page

  • 116020 -

PubMed ID

  • 23139044

Pubmed Central ID

  • 23139044

Electronic International Standard Serial Number (EISSN)

  • 1560-2281

Digital Object Identifier (DOI)

  • 10.1117/1.JBO.17.11.116020


  • eng

Conference Location

  • United States