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A 433 MHz Lucite cone waveguide applicator for superficial hyperthermia
G C van Rhoon1, P J Rietveld, J van der Zee
1University Hospital Rotterdam, Daniel den Hoed Cancer Center, Department of Radiation Oncology, Rotterdam, The Netherlands.
Summary
Researchers enhanced the effective field size (EFS) of a 433 MHz waveguide applicator using Lucite walls and a PVC cone. This simple modification significantly increases the EFS for hyperthermia treatments.
Area of Science:
- Medical Physics
- Biomedical Engineering
- Electromagnetics
Background:
- Conventional 433 MHz waveguide applicators have limitations in effective field size (EFS).
- Optimizing SAR distribution is crucial for effective hyperthermia treatment.
Purpose of the Study:
- To increase the EFS of a water-filled waveguide applicator.
- To evaluate modifications for improved SAR distribution and treatment efficacy.
Main Methods:
- Modified a 433 MHz waveguide applicator by replacing brass side walls with Lucite and inserting a PVC cone.
- Measured Specific Absorption Rate (SAR) distributions in layered fat-muscle phantoms at various depths.
- Conducted calorimetric measurements to assess applicator efficiency.
Main Results:
- Replacing brass walls with Lucite widened the SAR distribution, increasing EFS to 67 cm2.
- Adding a PVC cone further increased EFS to 91 +/- 6 cm2.
- Applicator efficiency remained comparable to conventional designs (50% vs. 56%).
Conclusions:
- Lucite walls and a PVC cone effectively increase the EFS of waveguide applicators.
- These modifications offer a simple, inexpensive method to enhance hyperthermia treatment.
- EFS is influenced by waterbolus dimensions, requiring careful consideration in application.