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Related Experiment Videos

Temperature measurement errors with thermocouples inside 27 MHz current source interstitial hyperthermia applicators.

R S Kaatee1, H Crezee, A G Visser

  • 1University Hospital Rotterdam--Daniel den Hoed Cancer Center/Dijkzigt Hospital, Department of Radiation Oncology, The Netherlands. kaatee@kfih.azr.nl

Physics in Medicine and Biology
|September 25, 1999
PubMed
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Accurate temperature measurement in interstitial hyperthermia (IHT) is crucial. Self-heating of applicator components, particularly feeder wires, significantly impacts temperature readings, necessitating careful calibration for effective thermal therapy.

Area of Science:

  • Medical Physics
  • Biomedical Engineering
  • Thermal Therapy

Background:

  • Interstitial hyperthermia (IHT) systems utilize multielectrode current sources (MECS) with thermocouple thermometry.
  • Catheters in IHT are often used for both heating and temperature monitoring to minimize patient trauma.
  • Accurate temperature measurement is critical for effective and safe thermal dose delivery.

Purpose of the Study:

  • To investigate the implications of temperature measurement within IHT applicators.
  • To quantify the impact of applicator and catheter self-heating on temperature readings.
  • To evaluate methods for estimating actual tissue temperature during IHT.

Main Methods:

  • A one-dimensional cylindrical model was employed to analyze temperature differences.

Related Experiment Videos

  • Relative artifact (ERR) was measured in phantom studies using various catheter materials.
  • Power-off temperature decay measurements were explored to estimate tissue temperature.

    • Main Results:

    • Self-heating of applicator feeder wires was identified as the primary cause for higher internal applicator temperatures (deltaTin) compared to tissue temperatures (deltaTout).
    • Energy absorption by the afterloading catheter contributed less than 5% to measurement error.
    • Temperature decay measurements indicated that applicator temperature approximates tissue temperature approximately 5 seconds after power-off.

    Conclusions:

    • Self-heating artifacts significantly influence temperature measurements within IHT applicators.
    • Power-off temperature decay offers a potential method for estimating tissue temperature.
    • Further investigation into ERR and delay time stability in perfused tissues is required for clinical reliability.