In vivo absorption spectroscopy in brain using small optical fiber probes: Effect of blood confinement

A. Bradu, R. Sablong, C. Julien, I. Troprès, J. F. Payen, Jacques Derouard

Research output: Contribution to journalArticle

Abstract

Broad band light absorption spectroscopy in the visible range (520-590 nm) has been carried out using implanted small optical fibers to probe the hemodynamics of deep tissues (striatum) in rat brain subjected to hypoxia, we observe a decrease of the cerebral blood oxygenation by a factor of up to two, while the cerebral blood volume (CBV) does not seem to increase significantly. However, nuclear magnetic resonance measurements of CBV in the same conditions using a magnetic contrast agent show that CBV increases by about 50%. This shows that absorption spectroscopy in the visible range strongly underestimates the CBV, probably due to the confinement of blood in vessels. This effect is confirmed by absorption spectroscopy measurements performed in phantoms with similar geometry.

Original languageEnglish (US)
Pages (from-to)85-90
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4432
DOIs
StatePublished - Jan 1 2001

Keywords

  • Blood/tissue constituent monitoring
  • Medical Optics and Biotechnology
  • Spectroscopy
  • Tissue diagnostics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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