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Summary

This study introduces a novel optical method for non-contact body temperature mapping. The developed system uses a thermal-sensitive upconversion system for accurate in vivo temperature monitoring.

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Area of Science:

  • Biomedical Optics
  • Nanotechnology
  • Physical Chemistry

Background:

  • Body temperature is critical for physiological processes and often requires non-contact monitoring methods.
  • Existing in vivo temperature measurement techniques can be invasive or lack sufficient sensitivity and resolution.
  • Optical approaches offer a promising avenue for minimally invasive physiological monitoring.

Purpose of the Study:

  • To develop a highly sensitive and accurate non-contact optical thermometer for in vivo temperature mapping.
  • To leverage the triplet-triplet annihilation (TTA) upconversion mechanism for temperature sensing.
  • To incorporate an internal calibration unit for reliable temperature measurements across the physiological range.

Main Methods:

  • Development of a novel temperature-responsive upconversion system based on the triplet-triplet annihilation (TTA) mechanism.
  • Incorporation of temperature-insensitive NaYF4:Nd nanophosphors emitting in the near-infrared (NIR) as an internal calibration standard.
  • Fabrication of a ratiometric thermometer for precise in vivo temperature monitoring.

Main Results:

  • The developed ratiometric thermometer demonstrated high thermal sensitivity of approximately 7.1% K⁻¹.
  • The system achieved a high temperature resolution of approximately 0.1 K.
  • The non-contact optical approach proved effective for monitoring temperature variations in vivo.

Conclusions:

  • A pioneering TTA-based upconversion system enables sensitive and accurate in vivo body temperature mapping.
  • The integrated internal calibration unit ensures reliable ratiometric temperature measurements.
  • This non-contact optical thermometer offers a valuable tool for physiological research and clinical applications.