Real-time electrochemical monitoring of brain tissue oxygen: a surrogate for functional magnetic resonance imaging in rodents

Neuroimage. 2010 Aug 15;52(2):549-55. doi: 10.1016/j.neuroimage.2010.04.187. Epub 2010 Apr 21.

Abstract

Long-term in-vivo electrochemistry (LIVE) enables real-time monitoring and measurement of brain metabolites. In this study we have simultaneously obtained blood oxygenation level dependent (BOLD) fMRI and amperometric tissue O(2) data from rat cerebral cortex, during both increases and decreases in inspired O(2) content. BOLD and tissue O(2) measurements demonstrated close correlation (r=0.7898) during complete (0%) O(2) removal, with marked negative responses occurring ca. 30s after the onset of O(2) removal. Conversely, when the inspired O(2) was increased (50, 70 and 100% O(2) for 1min) similar positive rapid changes (ca. 15s) in both the BOLD and tissue O(2) signals were observed. These findings demonstrate, for the first time, the practical feasibility of obtaining real-time metabolite information during fMRI acquisition, and that tissue O(2) concentration monitored using an O(2) sensor can serve as an index of changes in the magnitude of the BOLD response. As LIVE O(2) sensors can be used in awake animals performing specific behavioural tasks the technique provides a viable animal surrogate of human fMRI experimentation.

Publication types

  • Validation Study

MeSH terms

  • Animals
  • Brain Chemistry*
  • Brain Mapping / methods*
  • Brain* / blood supply
  • Cerebrovascular Circulation
  • Electrochemical Techniques / methods*
  • Electrodes, Implanted
  • Feasibility Studies
  • Magnetic Resonance Imaging / methods*
  • Male
  • Oxygen / blood
  • Oxygen / chemistry*
  • Rats
  • Rats, Sprague-Dawley
  • Time Factors

Substances

  • Oxygen