Hyperthermia system combined with a magnetic resonance imaging unit

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Oncology

Background:

• Magnetic resonance imaging (MRI) offers noninvasive monitoring of temperature, blood flow, and cell metabolism.
• Oncologic hyperthermia (HT) requires precise temperature control for effective treatment.
• Simultaneous heating and imaging present technical challenges in integrating HT devices with MRI units.

Purpose of the Study:

• To develop and test a system for simultaneous oncologic hyperthermia and MRI monitoring.
• To assess the compatibility and performance of an integrated HT applicator and MRI unit.
• To demonstrate noninvasive temperature imaging during hyperthermia treatment.

Main Methods:

• A mini-annular phased array hyperthermia applicator was integrated with a 0.5-T whole body MRI unit.
• Electromagnetic compatibility was achieved using filters, baluns, and switches.
• System performance was validated using a muscle-equivalent polyacrylamide gel phantom.

Main Results:

• The integrated hyperthermia and MRI system demonstrated no interference between devices.
• Noninvasive temperature images were successfully acquired with a resolution better than 1°C/cm.
• Molecular diffusion imaging enabled accurate temperature mapping before and during heating.

Conclusions:

• The combined HT and MRI system is feasible for simultaneous oncologic hyperthermia and monitoring.
• This integrated approach allows for precise, noninvasive temperature assessment during HT.
• The technology holds promise for improving the efficacy and safety of hyperthermia cancer treatments.