Combining near-infrared spectroscopy with electroencephalography and repetitive transcranial magnetic stimulation

Tiina Näsi; Kalle Kotilahti; Hanna Mäki; Ilkka Nissilä; Pekka Meriläinen

doi:10.1117/12.831650

9 July 2009 Combining near-infrared spectroscopy with electroencephalography and repetitive transcranial magnetic stimulation

Tiina Näsi, Kalle Kotilahti, Hanna Mäki, Ilkka Nissilä, Pekka Meriläinen

Author Affiliations +

Proceedings Volume 7369, Diffuse Optical Imaging II; 736905 (2009) https://doi.org/10.1117/12.831650
Event: European Conferences on Biomedical Optics, 2009, Munich, Germany

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.

Citation Download Citation

Tiina Näsi, Kalle Kotilahti, Hanna Mäki, Ilkka Nissilä, and Pekka Meriläinen "Combining near-infrared spectroscopy with electroencephalography and repetitive transcranial magnetic stimulation", Proc. SPIE 7369, Diffuse Optical Imaging II, 736905 (9 July 2009); https://doi.org/10.1117/12.831650

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