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Quantifying tissue temperature changes induced by infrared neural stimulation: numerical simulation and MR

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Infrared neural stimulation (INS) is a promising technique for brain research and clinical applications. This study quantifies temperature changes during INS, finding that typical parameters keep tissue warming below damaging thresholds, ensuring safety.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Biophysics

Background:

  • Infrared neural stimulation (INS) uses light-to-thermal conversion for neuronal depolarization.
  • Assessing thermal safety is crucial due to potential brain tissue damage.
  • Quantitative data for central nervous system thermal effects are limited.

Purpose of the Study:

  • To quantitatively measure and model temperature changes in ex vivo rat brains during INS.
  • To evaluate the safety of INS parameters for biological tissues.

Main Methods:

  • 7 Tesla MRI thermometry was used on ex vivo rat brains.
  • Infrared pulse trains were delivered at intensities from 0.1-1.0 J/cm².
  • The General BioHeat Transfer Model (GBHTM) simulated temperature changes.

Main Results:

  • INS pulse trains caused transient temperature increases followed by rapid cooling.
  • Multiple pulse trains with short intervals led to a temperature plateau.
  • Temperature increases remained below 1°C at 0.1-0.5 J/cm² and below 2°C at 1.0 J/cm², within safe limits.

Conclusions:

  • INS parameters commonly used in biological applications result in minimal, non-damaging temperature increases.
  • The study provides quantitative evidence supporting the safety of current INS practices for brain tissue.