Optically based quantification of absolute cerebral metabolic rate of oxygen (CMRO2) with high spatial resolution in rodents

Mohammad A. Yaseen, Vivek Srinivasan, Sava Sakadžić, Sergei A. Vinogradov, David A. Boas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Measuring oxygen delivery in brain tissue is important for identifying the pathophysiological changes associated with brain injury and various diseases such as cancer, stroke, and Alzheimer's disease. We have developed a multi-modal imaging system for minimally invasive measurement of cerebral oxygenation and blood flow in small animals with high spatial resolution. The system allows for simultaneous measurement of blood flow using Fourier-domain optical coherence tomography, and oxygen partial pressure (pO2) using either confocal or multiphoton phosphorescence lifetime imaging with exogenous porphyrin-based dyes sensitive to dissolved oxygen. Here we present the changes in pO 2 and blood flow in superficial cortical vessels of Sprague Dawley rats in response to conditions such as hypoxia, hyperoxia, and functional stimulation. pO2 measurements display considerable heterogeneity over distances that cannot be resolved with more widely used oxygen-monitoring techniques such as BOLD-fMRI. Large increases in blood flow are observed in response to functional stimulation and hypoxia. Our system allows for quantification of cerebral metabolic rate of oxygen (CMRO2) with high spatial resolution, providing a better understanding of metabolic dynamics during functional stimulation and under various neuropathologies. Ultimately, better insight into the underlying mechanisms of neuropathologies will facilitate the development of improved therapeutic strategies to minimize damage to brain tissue.

Original languageEnglish (US)
Title of host publicationPhotonic Therapeutics and Diagnostics VI
Volume7548
DOIs
StatePublished - Dec 1 2010
Externally publishedYes
EventPhotonic Therapeutics and Diagnostics VI - San Francisco, CA, United States
Duration: Jan 23 2010Jan 25 2010

Other

OtherPhotonic Therapeutics and Diagnostics VI
CountryUnited States
CitySan Francisco, CA
Period1/23/101/25/10

Keywords

  • blood flow
  • cerebral metabolism
  • lifetime imaging microscopy
  • OCT
  • oxygen partial pressure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

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    Yaseen, M. A., Srinivasan, V., Sakadžić, S., Vinogradov, S. A., & Boas, D. A. (2010). Optically based quantification of absolute cerebral metabolic rate of oxygen (CMRO2) with high spatial resolution in rodents. In Photonic Therapeutics and Diagnostics VI (Vol. 7548). [75483R] https://doi.org/10.1117/12.842904