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SAR patterns of external 915 MHz microwave applicators
W L Straube1, R J Myerson, B Emami
1Radiation Oncology Center, Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, Missouri 63110.
Summary
Tumour size impacts thermoradiotherapy outcomes. Selecting appropriate hyperthermia applicators is crucial for effective treatment by ensuring therapeutic temperatures cover the tumour volume.
Area of Science:
- Oncology
- Medical Physics
- Radiotherapy
Background:
- Tumour size is a key prognostic factor in thermoradiotherapy outcomes.
- Achieving adequate hyperthermia target volume coverage with therapeutic temperatures is critical for tumour control.
- Appropriate selection of hyperthermia applicators is essential for effective treatment.
Purpose of the Study:
- To evaluate the performance characteristics of commonly used hyperthermia applicators.
- To provide data for informed applicator selection in clinical settings.
- To support quality assurance in hyperthermia treatments.
Main Methods:
- Evaluation of commonly used hyperthermia applicators.
- Measurement of 75%, 50%, and 25% two-dimensional SAR (specific absorption rate) contours.
- Data approximation using rectangular contours at depths of 1-3 cm.
Main Results:
- Characterization of applicator performance based on SAR contours.
- Quantitative data on spatial heat distribution provided.
- Rectangular approximation of applicator coverage presented.
Conclusions:
- Accurate knowledge of applicator performance is crucial for clinical hyperthermia.
- This data aids in the initial step towards appropriate applicator selection.
- The findings are important for quality assurance in ongoing hyperthermia clinical trials.