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Computer-controlled temperature multiplexer for thermal dosimetry studies.

T P Ryan, R H Britt

    Journal of Biomedical Engineering
    |October 1, 1984
    PubMed
    Summary
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    A computer-controlled multiplexer automates thermistor impedance measurement for hyperthermia research. This system achieves high accuracy, with total error less than 0.10 degrees C when using precise calibration.

    Area of Science:

    • Biomedical Engineering
    • Thermal Medicine
    • Instrumentation

    Background:

    • Thermistor probes are essential for monitoring temperature distributions in hyperthermia research.
    • Accurate multi-probe temperature mapping is crucial for effective hyperthermia treatment delivery.
    • Current methods may lack automated capabilities for efficient data acquisition.

    Purpose of the Study:

    • To develop and validate a computer-controlled multiplexer system for automated thermistor impedance measurement.
    • To enable precise temperature conversion and multi-probe mapping in hyperthermia applications.
    • To quantify the overall system error for reliable thermal monitoring.

    Main Methods:

    • A computer-controlled multiplexer was designed for automated thermistor impedance measurement.

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  • A hardware interface schematic was developed and implemented.
  • An algorithm for thermistor impedance to temperature conversion was tested.
  • System accuracy was evaluated by comparing algorithm-derived temperatures with NBS-referenced mercury thermometer calibration data.

    • Main Results:

    • The developed system successfully automates thermistor impedance measurement and temperature conversion.
    • The algorithm accurately calculates individual thermistor temperatures.
    • When calibration intervals are 1.00 degree C or less, the total system error is less than 0.10 degree C.

    Conclusions:

    • The computer-controlled multiplexer provides an accurate and automated solution for multi-probe thermistor temperature mapping.
    • This system enhances the reliability and efficiency of thermal monitoring in hyperthermia research.
    • The validated low error margin supports its use in critical temperature-sensitive applications.