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A new inductive applicator for hyperthermia.

H Kato, T Ishida

    The Journal of Microwave Power
    |December 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    A novel inductive heating applicator was developed for deep heating cancer therapy. This applicator shows preferential heating of muscle over fat, with penetration depth influenced by both applicator and phantom dimensions.

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    Area of Science:

    • Biomedical Engineering
    • Medical Physics
    • Electromagnetics

    Background:

    • Inductive heating is a promising method for deep tissue thermal therapy.
    • Optimizing applicator design is crucial for targeted heat delivery in cancer treatment.
    • Understanding heat penetration dynamics is essential for therapeutic efficacy and safety.

    Purpose of the Study:

    • To design and evaluate a novel one-turn, square, column-like coil applicator for inductive heating.
    • To investigate the factors influencing the depth of heat penetration in biological tissues.
    • To assess the applicator's suitability for deep heating cancer therapy by analyzing differential heating of muscle and fat layers.

    Main Methods:

    • A novel applicator design featuring a one-turn, square, column-like coil was fabricated.

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  • Radiofrequency (RF) current was applied to the coil to induce heating.
  • Depth of penetration was calculated and experimentally validated using agar phantoms of varying dimensions (60x60x60 cm and 20x40x60 cm).
  • Differential heating in muscle-equivalent and fat-equivalent phantom layers was analyzed.

    • Main Results:

    • Calculated penetration depth for a 20x20x60 cm applicator was 11.7 cm.
    • Experimental penetration depth in a 60x60x60 cm muscle-equivalent phantom was 9.6 cm.
    • Experimental penetration depth in a 20x40x60 cm phantom was 6.3 cm, indicating dependence on phantom shape and size.
    • The applicator demonstrated significantly less heating in fat layers compared to muscle layers.

    Conclusions:

    • The designed inductive applicator is suitable for deep heating applications in cancer therapy.
    • Penetration depth is influenced by applicator geometry and the dimensions/shape of the heated material.
    • Preferential heating of muscle tissue over fat tissue makes this applicator advantageous for targeted thermal therapy.