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Thermoimaging of the brain

I A Shevelev1, E N Tsicalov, A M Gorbach

  • 1Institute of Higher Nervous Activity and Neurophysiology, USSR Academy of Sciences, Moscow.

Journal of Neuroscience Methods
|January 1, 1993
PubMed
Summary

A novel neuroimaging technique, Thermoencephaloscopy (TES), non-invasively maps brain activity by detecting subtle temperature changes. This method reveals localized brain activation and deactivation zones, offering new insights into neural dynamics.

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Area of Science:

  • Neuroimaging
  • Neuroscience
  • Biophysics

Background:

  • Current neuroimaging methods have limitations in spatial and temporal resolution for dynamic brain activity.
  • Investigating brain function requires non-invasive techniques capable of detecting subtle physiological changes.

Purpose of the Study:

  • To introduce Thermoencephaloscopy (TES), a new neuroimaging method for dynamic brain thermal field investigation.
  • To characterize the technical specifications and capabilities of TES for studying cerebral cortex activity.

Main Methods:

  • Thermoencephaloscopy (TES) combines thermovision and digital image processing.
  • Records weak changes in infra-red radiation from the brain through an unopened skull.
  • Achieves high differential thermosensitivity (0.002°C), temporal resolution (40 ms), and spatial resolution (70 microns/pixel).

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Main Results:

  • TES enables dynamic investigation of thermal fields in the cerebral cortex.
  • Detects and studies topography and dynamics of small (140-300 microns) localized brain activation/deactivation zones.
  • Revealed fast thermowaves spreading over the brain cortex during sensory stimulation in various animal models and humans.

Conclusions:

  • TES is a powerful tool for studying brain function with high sensitivity and resolution.
  • The method allows for modal and regionally specific analysis of brain activity in response to stimuli.
  • Potential mechanisms include neuronal ion currents, metabolic heat, blood flow, and thermodipole formation.