Haeussinger, Florian B. and Heinzel, Sebastian and Hahn, Tim and Schecklmann, Martin and Ehlis, Ann-Christine and Fallgatter, Andreas J. (2011) Simulation of Near-Infrared Light Absorption Considering Individual Head and Prefrontal Cortex Anatomy: Implications for Optical Neuroimaging. PLOS ONE, 6 (10): e26377. ISSN 1932-6203,
Full text not available from this repository. (Request a copy)Abstract
Functional near-infrared spectroscopy (fNIRS) is an established optical neuroimaging method for measuring functional hemodynamic responses to infer neural activation. However, the impact of individual anatomy on the sensitivity of fNIRS measuring hemodynamics within cortical gray matter is still unknown. By means of Monte Carlo simulations and structural MRI of 23 healthy subjects (mean age: (25.0 +/- 2.8) years), we characterized the individual distribution of tissue-specific NIR-light absorption underneath 24 prefrontal fNIRS channels. We, thereby, investigated the impact of scalp-cortex distance (SCD), frontal sinus volume as well as sulcal morphology on gray matter volumes (V-gray) traversed by NIR-light, i.e. anatomy-dependent fNIRS sensitivity. The NIR-light absorption between optodes was distributed describing a rotational ellipsoid with a mean penetration depth of (23.6 +/- 0.7) mm considering the deepest 5% of light. Of the detected photon packages scalp and bone absorbed (96.4 +/- 9: 7)% and V-gray absorbed (3.1 +/- 1.8)% of the energy. The mean V-gray volume (1.1 +/- 0.4)cm(3) was negatively correlated (r = - .76) with the SCD and frontal sinus volume (r = - .57) and was reduced by 41.5% in subjects with relatively large compared to small frontal sinus. Head circumference was significantly positively correlated with the mean SCD (r = .46) and the traversed frontal sinus volume (r = .43). Sulcal morphology had no significant impact on V-gray. Our findings suggest to consider individual SCD and frontal sinus volume as anatomical factors impacting fNIRS sensitivity. Head circumference may represent a practical measure to partly control for these sources of error variance.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BEER-LAMBERT LAW; ADULT HEAD; HUMAN BRAIN; SPECTROSCOPY FNIRS; PHOTON MIGRATION; PROPAGATION; SCATTERING; MODEL; TISSUES; MEDIA; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Psychiatrie und Psychotherapie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Jun 2020 04:53 |
| Last Modified: | 02 Jun 2020 04:53 |
| URI: | https://pred.uni-regensburg.de/id/eprint/19955 |
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