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Local tumor hyperthermia using a computer-controlled microwave system

R L Magin, T S Fu, R E Beard

    Bioelectromagnetics
    |January 1, 1982
    PubMed
    Summary
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    This study presents a novel minicomputer system for precise microwave hyperthermia control. The system minimizes temperature measurement errors, ensuring accurate tumor heating and preventing skin burns.

    Area of Science:

    • Biomedical Engineering
    • Medical Physics
    • Oncology

    Background:

    • Microwave hyperthermia offers a promising cancer treatment modality.
    • Accurate temperature control is crucial for effective hyperthermia and minimizing side effects.
    • Electromagnetic interference with temperature probes can compromise treatment precision.

    Purpose of the Study:

    • To design and implement a minicomputer-based system for precise control of microwave hyperthermia.
    • To minimize temperature measurement errors caused by electromagnetic fields.
    • To achieve accurate and safe tumor temperature regulation during hyperthermia treatment.

    Main Methods:

    • A minicomputer system was developed to regulate 2.45-GHz microwave power to four applicators.
    • Temperature measurements were taken only during microwave power-off cycles to avoid electromagnetic interference.

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  • A programmable controller regulated tumor temperature in 0.1°C increments between 30°C and 60°C.

    • Main Results:

    • The system effectively minimized temperature measurement errors.
    • Temperature differences within the tumor at steady state were reduced to less than 0.4°C.
    • The technique successfully prevented skin burns.

    Conclusions:

    • The developed minicomputer system enables accurate and safe microwave hyperthermia.
    • Intermittent temperature sampling is an effective strategy to overcome probe interference.
    • This approach enhances the therapeutic ratio of hyperthermia treatments.