Comparative theoretical performance for two types of regional hyperthermia systems

Area of Science:

• Biomedical Engineering
• Medical Physics
• Oncology

Background:

• Regional hyperthermia aims to noninvasively deposit power into deep-seated tumors.
• Magnetic induction devices and annular phased arrays are clinically relevant systems for regional hyperthermia.

Purpose of the Study:

• To theoretically compare the specific absorption rate (SAR) and temperature distributions of magnetic induction devices and annular phased array applicators.
• To evaluate the efficacy of these systems for heating deep-seated tumors in diverse anatomical locations.

Main Methods:

• Utilized the finite element method for electromagnetic and thermal boundary value problems.
• Generated six detailed patient models from CT-scan data (pelvic, visceral, thoracic regions).
• Simulated power deposition and temperature increases for various tumor locations.

Main Results:

• Annular phased arrays generally deposited more power within tumors and achieved better temperature distributions compared to magnetic induction devices.
• Neither system demonstrated a sufficiently high ratio of tumor power absorption to normal tissue absorption.
• Significant heating of perfused tumors to therapeutic temperatures was not achieved under various physiological conditions.

Conclusions:

• Annular phased arrays show potential advantages over magnetic induction devices for regional hyperthermia.
• Current regional hyperthermia systems may require further optimization to effectively treat perfused tumors.
• Findings can assist physicians in comparative treatment planning for regional hyperthermia.