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Human leg heating using a mini-annular phased array.

C K Charny, J L Guerquin-Kern, M J Hagmann

    Medical Physics
    |July 1, 1986
    PubMed
    Summary
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    This study mapped energy deposition in a human leg using a mini-annular phased array (MAPA) hyperthermia device. Heating patterns were observed to be skewed, with significant temperature increases in bone, fat, and muscle tissues.

    Area of Science:

    • Biomedical Engineering
    • Medical Physics
    • Hyperthermia Therapy

    Background:

    • Hyperthermia therapy utilizes heat to treat diseases, often in conjunction with other treatments like radiation or chemotherapy.
    • Understanding energy deposition patterns is crucial for effective and safe application of hyperthermia.

    Purpose of the Study:

    • To determine the energy deposition pattern within an isolated human leg heated by a mini-annular phased array (MAPA) hyperthermia applicator.
    • To investigate the influence of applicator positioning on heating distribution.

    Main Methods:

    • An isolated human leg, fixed in ethanol/saline and rehydrated, was heated using a MAPA at 122 MHz.
    • Temperature changes were measured at 143 anatomical locations to calculate specific absorption rates and electric field strengths.

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    Main Results:

    • Maximum heating was skewed towards the ankle when the leg was coaxial with the MAPA, positioned between the knee and ankle.
    • Significant temperature increases were observed in bone, fat, and muscle tissues.
    • Shifting the leg off the MAPA axis reduced bone heating.

    Conclusions:

    • The MAPA applicator produces a skewed energy deposition pattern in a human leg, influenced by positioning.
    • Hyperthermia treatment can affect various tissue types, including bone, fat, and muscle.
    • Positioning adjustments can modulate heating patterns and potentially spare certain tissues like bone.