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Related Experiment Videos

Specific absorption rate and tissue temperature in local hyperthermia.

H Griffiths, A Ahmed, C W Smith

    International Journal of Radiation Oncology, Biology, Physics
    |November 1, 1986
    PubMed
    Summary
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    This study measured specific absorption rate (SAR) and tissue temperature during local hyperthermia cancer treatments. Results show SAR varied by site, with superficial tumors achieving therapeutic temperatures more effectively than deeper ones.

    Area of Science:

    • Biomedical Engineering
    • Oncology
    • Medical Physics

    Background:

    • Local hyperthermia is a cancer treatment modality.
    • Effective delivery of hyperthermia requires precise control of energy deposition and resulting tissue temperature.
    • Understanding the relationship between applied power, specific absorption rate (SAR), and tissue temperature is crucial for optimizing treatment outcomes.

    Purpose of the Study:

    • To measure specific absorption rate (SAR) and tissue temperature in patients undergoing local hyperthermia for cancer.
    • To develop and validate a method for evaluating SAR from temperature data during electromagnetic hyperthermia.
    • To assess the efficacy of capacitive coupling using 13.56 MHz electromagnetic energy for heating different tumor sites.

    Main Methods:

    Related Experiment Videos

  • Conducted 83 local hyperthermia treatments on 33 cancer patients using 13.56 MHz electromagnetic energy and capacitive coupling.
  • Measured specific absorption rate (SAR) and tissue temperature throughout treatments.
  • Developed a method to evaluate SAR from tissue temperature changes following step changes in applied power, requiring interference-free temperature traces and monitored total power delivery.

    • Main Results:

    • Mean SAR values ranged from 4.6 to 89 W kg-1, varying by treatment site.
    • Superficial tumors achieved temperatures >42°C in 69% of treatments; only 4% of axillary node treatments exceeded this temperature.
    • A tumor model suggested a need for systemic heating to 40°C or a fourfold increase in SAR to reach 42°C in typical cervix tumors.

    Conclusions:

    • Measured SAR and temperature are vital for feedback control in computational models predicting temperature distribution during hyperthermia.
    • SAR measurements enable direct comparison of power deposition from different clinical hyperthermia devices.
    • The findings provide a basis for comparing capacitive coupling hyperthermia with other heating systems in clinical practice.