Related Experiment Videos
Evaluation of ring capacitor plates for regional deep heating
G C Van Rhoon1, A G Visser, P M Van den Berg
1Department of Hyperthermia, Rotterdam Radiotherapeutic Institute, The Netherlands.
Summary
A new capacitive applicator offers potential for regional deep hyperthermia, achieving homogeneous heating in tissue phantoms up to 13.5 cm. Further research is needed for larger diameters, but it shows promise for tumor treatment.
Area of Science:
- Medical Physics
- Biomedical Engineering
- Electromagnetic Therapy
Background:
- Capacitive systems are explored for hyperthermia applications.
- Developing effective applicators for regional deep heating is crucial for cancer treatment.
Purpose of the Study:
- To develop and evaluate a quasi-microwave cavity applicator for regional deep hyperthermia.
- To assess the Specific Absorption Rate (SAR) distribution and heating homogeneity in phantom tissues.
Main Methods:
- A capacitive applicator operating at 13.56 or 27.12 MHz was developed.
- Infrared thermography and the 'split phantom' technique were used to measure SAR distributions in cylindrical phantoms.
- Phantom diameters up to 22.5 cm were tested with varying ring electrode configurations.
Main Results:
- Homogeneous heating (70-100% of max SAR) was achieved for phantom diameters up to 13.5 cm.
- For larger diameters (22.5 cm), central SAR decreased to 30-40% of max SAR, necessitating adjustments to reduce hot spots.
- No phantom surface or electrode cooling was applied during experiments.
Conclusions:
- The developed applicator shows feasibility for regional deep heating, particularly for tissue diameters up to 13.5 cm.
- Further experimental work is required for larger tissue volumes and optimization.
- The applicator design holds potential clinical value for hyperthermic treatment of tumors in extremities.