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Changes in scalp and cortical blood flow during hyperventilation measured with diffusing-wave spectroscopy

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2009

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https://doi.org/10.1117/12.831575
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GEORGAKOUDI, Irene, ed. and others. Clinical and biomedical spectroscopy : 16 - 18 June 2009, Munich, Germany ; [in the framwork European Conferences on Biomedical Optics (ECBO)]. Bellingham, Washington: SPIE, 2009, 73682C. Proceedings of SPIE. 7368. ISSN 0277-786X. ISBN 978-0-8194-7644-9. Available under: doi: 10.1117/12.831575

Zusammenfassung

Changes in scalp and cortical blood flow induced by voluntary hyperventilation are investigated by near-infrared diffusing-wave spectroscopy. The temporal intensity autocorrelation function g(2) (τ) of multiply scattered light is recorded from the forehead of subjects during hyperventilation. Blood flow within the sampled tissue volume is estimated by the mean decay rate of g(2) (τ) . Data measured from six subjects show that the pattern of the hemodynamic response during 50 s hyperventilation is rather complicated: within the first 10 s, in three subjects an initial increase in blood flow is observed; from 10 s to 20 s, the mean blood flow is smaller than its baseline value for all six subjects; for the duration from 20 s to 30 s, the blood flow increases again. However, after 30 s the change is not consistent across subjects. Further study on one of these subjects by using two receivers probing the blood flow in the cortex and in the superficial layers simultaneously, reveals that during hyperventilation, the direction of change in blood flow within the scalp is opposite to the one in the brain. This helps to understand the complicated hemodynamic response observed in our measurements.

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530 Physik

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Clinical and biomedical spectroscopy / European Conferences on Biomedical Optics, 16. Juni 2009 - 18. Juni 2009, München
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ISO 690LI, Jun, Markus NINCK, Thomas GISLER, 2009. Changes in scalp and cortical blood flow during hyperventilation measured with diffusing-wave spectroscopy. Clinical and biomedical spectroscopy / European Conferences on Biomedical Optics. München, 16. Juni 2009 - 18. Juni 2009. In: GEORGAKOUDI, Irene, ed. and others. Clinical and biomedical spectroscopy : 16 - 18 June 2009, Munich, Germany ; [in the framwork European Conferences on Biomedical Optics (ECBO)]. Bellingham, Washington: SPIE, 2009, 73682C. Proceedings of SPIE. 7368. ISSN 0277-786X. ISBN 978-0-8194-7644-9. Available under: doi: 10.1117/12.831575
BibTex
@inproceedings{Li2009Chang-58151,
  year={2009},
  doi={10.1117/12.831575},
  title={Changes in scalp and cortical blood flow during hyperventilation measured with diffusing-wave spectroscopy},
  number={7368},
  isbn={978-0-8194-7644-9},
  issn={0277-786X},
  publisher={SPIE},
  address={Bellingham, Washington},
  series={Proceedings of SPIE},
  booktitle={Clinical and biomedical spectroscopy : 16 - 18 June 2009, Munich, Germany ; [in the framwork European Conferences on Biomedical Optics (ECBO)]},
  editor={Georgakoudi, Irene},
  author={Li, Jun and Ninck, Markus and Gisler, Thomas},
  note={Zugleich: Progress in biomedical optics and Imaging ; Vol. 10, No. 44 Article Number: 73682C}
}
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    <dcterms:abstract xml:lang="eng">Changes in scalp and cortical blood flow induced by voluntary hyperventilation are investigated by near-infrared diffusing-wave spectroscopy. The temporal intensity autocorrelation function g(2) (τ) of multiply scattered light is recorded from the forehead of subjects during hyperventilation. Blood flow within the sampled tissue volume is estimated by the mean decay rate of g(2) (τ) . Data measured from six subjects show that the pattern of the hemodynamic response during 50 s hyperventilation is rather complicated: within the first 10 s, in three subjects an initial increase in blood flow is observed; from 10 s to 20 s, the mean blood flow is smaller than its baseline value for all six subjects; for the duration from 20 s to 30 s, the blood flow increases again. However, after 30 s the change is not consistent across subjects. Further study on one of these subjects by using two receivers probing the blood flow in the cortex and in the superficial layers simultaneously, reveals that during hyperventilation, the direction of change in blood flow within the scalp is opposite to the one in the brain. This helps to understand the complicated hemodynamic response observed in our measurements.</dcterms:abstract>
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Zugleich: Progress in biomedical optics and Imaging ; Vol. 10, No. 44
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