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• W4313476841 abstract "This work targets the contamination of optical signals by superficial hemodynamics, which is one of the chief hurdles in non-invasive optical measurements of the human brain.To identify optimal source-detector distances for dual-slope (DS) measurements in frequency-domain (FD) near-infrared spectroscopy (NIRS) and demonstrate preferential sensitivity of DS imaging to deeper tissue (brain) versus superficial tissue (scalp).Theoretical studies (in-silico) based on diffusion theory in two-layered and in homogeneous scattering media. In-vivo demonstrations of DS imaging of the human brain during visual stimulation and during systemic blood pressure oscillations.The mean distance (between the two source-detector distances needed for DS) is the key factor for depth sensitivity. In-vivo imaging of the human occipital lobe with FD NIRS and a mean distance of 31 mm indicated: (1) greater hemodynamic response to visual stimulation from FD phase versus intensity, and from DS versus single-distance (SD); (2) hemodynamics from FD phase and DS mainly driven by blood flow, and hemodynamics from SD intensity mainly driven by blood volume.DS imaging with FD NIRS may suppress confounding contributions from superficial hemodynamics without relying on data at short source-detector distances. This capability can have significant implications for non-invasive optical measurements of the human brain." @default.
• W4313476841 created "2023-01-06" @default.
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• W4313476841 date "2023-01-02" @default.
• W4313476841 modified "2023-09-25" @default.
• W4313476841 title "Dual-slope imaging of cerebral hemodynamics with frequency-domain near-infrared spectroscopy" @default.
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• W4313476841 doi "https://doi.org/10.1117/1.nph.10.1.013508" @default.
• W4313476841 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36601543" @default.
• W4313476841 hasPublicationYear "2023" @default.
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