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Proceedings Paper

Combining near-infrared spectroscopy with electroencephalography and repetitive transcranial magnetic stimulation
Author(s): Tiina Näsi; Kalle Kotilahti; Hanna Mäki; Ilkka Nissilä; Pekka Meriläinen
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Paper Abstract

The objective of the study was to assess the usability of a near-infrared spectroscopy (NIRS) device in multimodal measurements. We combined NIRS with electroencephalography (EEG) to record hemodynamic responses and evoked potentials simultaneously, and with transcranial magnetic stimulation (TMS) to investigate hemodynamic responses to repetitive TMS (rTMS). Hemodynamic responses and visual evoked potentials (VEPs) to 3, 6, and 12 s stimuli consisting of pattern-reversing checkerboards were successfully recorded in the NIRS/EEG measurement, and ipsi- and contralateral hemodynamic responses to 0.5, 1, and 2 Hz rTMS in the NIRS/TMS measurement. In the NIRS/EEG measurements, the amplitudes of the hemodynamic responses increased from 3- to 6-s stimulus, but not from 6- to 12-s stimulus, and the VEPs showed peaks N75, P100, and N135. In the NIRS/TMS measurements, the 2-Hz stimulus produced the strongest hemodynamic responses compared to the 0.5- and 1-Hz stimuli. In two subjects oxyhemoglobin concentration decreased and in one increased as a consequence of the 2-Hz rTMS. To locate the origin of the measured NIRS responses, methods have to be developed to investigate TMS-induced scalp muscle contractions. In the future, multimodal measurements may prove useful in monitoring or treating diseases such as stroke or Alzheimer's disease.

Paper Details

Date Published: 10 July 2009
PDF: 7 pages
Proc. SPIE 7369, Diffuse Optical Imaging II, 736905 (10 July 2009); doi: 10.1117/12.831650
Show Author Affiliations
Tiina Näsi, Helsinki Univ. of Technology (Finland)
BioMag Lab., HUSLAB, Helsinki Univ. Central Hospital (Finland)
Kalle Kotilahti, Helsinki Univ. of Technology (Finland)
BioMag Lab., HUSLAB, Helsinki Univ. Central Hospital (Finland)
Hanna Mäki, Helsinki Univ. of Technology (Finland)
BioMag Lab., HUSLAB, Helsinki Univ. Central Hospital (Finland)
Ilkka Nissilä, Helsinki Univ. of Technology (Finland)
Pekka Meriläinen, Helsinki Univ. of Technology (Finland)


Published in SPIE Proceedings Vol. 7369:
Diffuse Optical Imaging II
Rinaldo Cubeddu; Andreas H. Hielscher, Editor(s)

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