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Problems involved in temperature measurements using EIT

E Gersing1, W Krüger, M Osypka

  • 1Zentrum Physiologie und Pathophysiologie der Universität, Göttingen, Germany.

Physiological Measurement
|August 1, 1995
PubMed
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Electrical impedance tomography (EIT) shows potential for monitoring hyperthermia cancer therapy by measuring tissue impedance. However, temperature-dependent fluid shifts challenge its accuracy as a direct temperature measurement method.

Area of Science:

  • Biomedical Engineering
  • Medical Physics
  • Oncology

Background:

  • Hyperthermia cancer therapy using microwaves necessitates accurate non-invasive temperature monitoring.
  • Electrical impedance tomography (EIT) is explored for mapping temperature distributions by assessing temperature-dependent tissue impedance.

Purpose of the Study:

  • To evaluate the feasibility of EIT for measuring temperature distribution during microwave hyperthermia.
  • To investigate the impact of temperature-induced tissue fluid changes on EIT accuracy.

Main Methods:

  • Analysis of temperature coefficients of resistivity in biological tissues.
  • Measurement of impedance spectra in rat skeletal muscle and tumors during hyperthermia.
  • Assessment of potential errors in impedance measurements due to physiological changes.

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Main Results:

  • Tissue resistivity exhibits temperature coefficients ranging from -1.3% °C⁻¹ to -3% °C⁻¹, differing from initial assumptions.
  • Temperature-induced fluid shifts, edema, and membrane changes significantly affect tissue impedance.
  • While direct temperature measurement accuracy is questioned, EIT can detect hyperthermia-induced tissue alterations.

Conclusions:

  • EIT's direct application for precise temperature measurement in hyperthermia is challenged by variable tissue responses.
  • EIT remains valuable for detecting qualitative changes in tissue during hyperthermia, such as fluid shifts and edema.
  • Further research is needed to refine EIT methodologies for reliable temperature monitoring in cancer therapy.