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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 4, Iss. 3 — Mar. 1, 2013
  • pp: 412–426

Effect of task-related extracerebral circulation on diffuse optical tomography: experimental data and simulations on the forehead

Tiina Näsi, Hanna Mäki, Petri Hiltunen, Juha Heiskala, Ilkka Nissilä, Kalle Kotilahti, and Risto J. Ilmoniemi  »View Author Affiliations

Biomedical Optics Express, Vol. 4, Issue 3, pp. 412-426 (2013)

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The effect of task-related extracerebral circulatory changes on diffuse optical tomography (DOT) of brain activation was evaluated using experimental data from 14 healthy human subjects and computer simulations. Total hemoglobin responses to weekday-recitation, verbal-fluency, and hand-motor tasks were measured with a high-density optode grid placed on the forehead. The tasks caused varying levels of mental and physical stress, eliciting extracerebral circulatory changes that the reconstruction algorithm was unable to fully distinguish from cerebral hemodynamic changes, resulting in artifacts in the brain activation images. Crosstalk between intra- and extracranial layers was confirmed by the simulations. The extracerebral effects were attenuated by superficial signal regression and depended to some extent on the heart rate, thus allowing identification of hemodynamic changes related to brain activation during the verbal-fluency task. During the hand-motor task, the extracerebral component was stronger, making the separation less clear. DOT provides a tool for distinguishing extracerebral components from signals of cerebral origin. Especially in the case of strong task-related extracerebral circulatory changes, however, sophisticated reconstruction methods are needed to eliminate crosstalk artifacts.

© 2013 OSA

OCIS Codes
(170.0110) Medical optics and biotechnology : Imaging systems
(170.1470) Medical optics and biotechnology : Blood or tissue constituent monitoring
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.6960) Medical optics and biotechnology : Tomography

ToC Category:
Neuroscience and Brain Imaging

Original Manuscript: October 26, 2012
Revised Manuscript: January 28, 2013
Manuscript Accepted: February 7, 2013
Published: February 13, 2013

Tiina Näsi, Hanna Mäki, Petri Hiltunen, Juha Heiskala, Ilkka Nissilä, Kalle Kotilahti, and Risto J. Ilmoniemi, "Effect of task-related extracerebral circulation on diffuse optical tomography: experimental data and simulations on the forehead," Biomed. Opt. Express 4, 412-426 (2013)

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