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Correction of microwave-induced thermistor sensor errors.

G M Samaras, S Rosenbloom, A Y Cheung

    Medical Physics
    |May 1, 1983
    PubMed
    Summary
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    Accurate thermometry is crucial for microwave hyperthermal cancer therapy. Miniature thermistors, when corrected for power-related errors, enable precise temperature measurements within 0.1 degrees C for invasive applicators.

    Area of Science:

    • Biomedical Engineering
    • Medical Physics
    • Oncology

    Background:

    • Accurate temperature monitoring is critical for effective microwave-induced hyperthermal cancer therapy.
    • Traditional temperature sensors face challenges in strong electromagnetic fields.
    • Interstitial radiator/sensor systems offer a potential solution for in-situ measurements.

    Purpose of the Study:

    • To develop and validate a method for accurate thermometry in microwave hyperthermia.
    • To investigate the sensor error characteristics of miniature thermistors in electromagnetic fields.
    • To enable precise temperature measurements for improved cancer treatment efficacy.

    Main Methods:

    • Utilizing miniature thermistors bonded to invasive microwave applicators.
    • Characterizing sensor error as a linear function of transmitted microwave power.

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  • Implementing an instrumental method for real-time thermistor error correction.
  • Empirically validating the accuracy of the corrected temperature measurements.

    • Main Results:

    • Miniature thermistors bonded to microwave applicators show a linear sensor error related to power.
    • The proposed correction method allows for temperature measurements with an accuracy of +/- 0.1 degrees C or better.
    • The instrumental methods and empirical validation confirm the reliability of the thermometry system.

    Conclusions:

    • Accurate thermometry is achievable in microwave hyperthermia using corrected miniature thermistors.
    • This technique enhances the safety and efficacy of microwave-induced hyperthermal cancer therapy.
    • The validated method provides a reliable tool for temperature monitoring in clinical applications.