Experimental and clinical evaluation of a prototype hyperthermia system

Area of Science:

• Biomedical Engineering
• Medical Physics
• Oncology

Background:

• Hyperthermia therapy requires precise thermal distribution for efficacy.
• Existing radiofrequency (RF) heating systems may have limitations in power output and applicator size.
• Development of advanced heating systems is crucial for improving cancer treatment outcomes.

Purpose of the Study:

• To develop and evaluate a high-output radiofrequency capacitive heating system (13.56 MHz, 1000 W) for improved thermal distribution in hyperthermia.
• To assess the system's performance in phantom, animal, and clinical settings.
• To identify and address limitations in achieving optimal thermal distribution.

Main Methods:

• Development of a 1000-watt radiofrequency capacitive heating system (Inter Nova Inc., IH-1000) operating at 13.56 MHz.
• Evaluation using an agar phantom study to assess heating homogeneity and depth.
• In vivo studies involving a miniature pig model.
• Clinical trials to assess performance in human patients.

Main Results:

• The agar phantom study demonstrated homogeneous and deep-heating capabilities.
• The animal study showed good thermal distribution but highlighted a challenge with overheating the subcutaneous fat layer.
• Clinical applications revealed some persistent limiting factors, but the issue of insufficient power supply was successfully overcome.

Conclusions:

• The developed 1000-watt RF capacitive heating system offers potential for improved hyperthermia treatment due to its deep-heating capabilities.
• Further refinement is needed to address localized overheating, particularly in subcutaneous fat, for broader clinical adoption.
• The system successfully resolved previous power supply limitations, enabling more robust therapeutic applications.