Publikation: Transient functional blood flow change in the human brain measured noninvasively by diffusing-wave spectroscopy
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2009
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Optics letters. 2009, 33(19), pp. 2233-2235. ISSN 0146-9592. eISSN 1539-4794. Available under: doi: 10.1364/OL.33.002233
Zusammenfassung
Multispeckle diffusing-wave spectroscopy (DWS) is used to measure blood flow transients in the human visual cortex following stimulation by 7.5 Hz full-field and checkerboard flickering. The average decay time τd characterizing the decay of the DWS autocorrelation function shows a biphasic behavior; within about 2 s after stimulation onset, τd increases rapidly to about 6% above the baseline value. At later times, τd slowly decreases and reaches a steady-state value about 5% below the baseline value after about 15 s. The initial increase of the DWS signal suggests a transient reduction of the cortical blood flow velocity shortly after stimulation onset. Measurements of this transient response at different positions over the primary visual cortex show a spatial pattern different from the one measured by electroencephalography.
Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
530 Physik
Schlagwörter
Blutfluß, Gehirn, nicht invasive Messung, blood flow change, diffusing-wave spectroscopy, brain
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LI, Jun, Markus NINCK, Leonie KOBAN, Thomas ELBERT, Johanna KISSLER, Thomas GISLER, 2009. Transient functional blood flow change in the human brain measured noninvasively by diffusing-wave spectroscopy. In: Optics letters. 2009, 33(19), pp. 2233-2235. ISSN 0146-9592. eISSN 1539-4794. Available under: doi: 10.1364/OL.33.002233BibTex
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year={2009},
doi={10.1364/OL.33.002233},
title={Transient functional blood flow change in the human brain measured noninvasively by diffusing-wave spectroscopy},
number={19},
volume={33},
issn={0146-9592},
journal={Optics letters},
pages={2233--2235},
author={Li, Jun and Ninck, Markus and Koban, Leonie and Elbert, Thomas and Kissler, Johanna and Gisler, Thomas}
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<dcterms:abstract xml:lang="eng">Multispeckle diffusing-wave spectroscopy (DWS) is used to measure blood flow transients in the human visual cortex following stimulation by 7.5 Hz full-field and checkerboard flickering. The average decay time τd characterizing the decay of the DWS autocorrelation function shows a biphasic behavior; within about 2 s after stimulation onset, τd increases rapidly to about 6% above the baseline value. At later times, τd slowly decreases and reaches a steady-state value about 5% below the baseline value after about 15 s. The initial increase of the DWS signal suggests a transient reduction of the cortical blood flow velocity shortly after stimulation onset. Measurements of this transient response at different positions over the primary visual cortex show a spatial pattern different from the one measured by electroencephalography.</dcterms:abstract>
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