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RF H-field fluxtubes for safe and controlled hyperthermia
C Franconi1, G Banci, C A Tiberio
1Medical Physics Division, Tor Vergata University of Rome, Italy.
Summary
A new radiofrequency (RF) applicator uses a toroidal resonator for localized hyperthermia treatment. This device enables precise, inductive heating of muscle tissue without needing a water bolus, improving therapeutic outcomes.
Area of Science:
- Medical Physics
- Biomedical Engineering
- Electromagnetics
Background:
- Hyperthermia therapy utilizes heat for medical treatment.
- Existing RF applicators face challenges in precise and localized energy delivery.
- The need for advanced applicators for targeted tissue heating is critical.
Purpose of the Study:
- To introduce a novel low radiofrequency (RF) hyperthermia applicator.
- To evaluate the heating characteristics and localization capabilities of the new applicator.
- To explore methods for optimizing heating field penetration and uniformity.
Main Methods:
- Design and construction of a toroidal resonator with treatment ports creating an air gap.
- Utilizing a 27 MHz RF magnetic field fluxtube for inductive heating.
- Assessment using cylindrical muscle and fat-muscle phantoms.
- Investigating the effect of auxiliary electrodes for field superposition.
Main Results:
- The applicator generates a high-density, uniform RF magnetic field fluxtube.
- Heating is predominantly inductive, localized within muscle tissue.
- A water bolus is unnecessary due to the absence of stray electric fields.
- Heating field optimization achieved through geometric shaping and auxiliary electrodes.
Conclusions:
- The novel toroidal applicator offers precise, localized inductive heating for hyperthermia.
- The design allows for adjustable steering of the heating field.
- Superimposition of fields enhances heating penetration and localization, offering a promising advancement in hyperthermia treatment.