Sukhoon Oh1, Colin A. Roopnariane2,
Mohammad-Reza Tofighi2, Christopher M. Collins1
1PSU College of Medicine, Hershey, PA,
United States; 2Engineering and Technology, Penn State University,
Middletown, PA, United States
For
evaluation of techniques for measuring heating related to specific absorption
rate (SAR) in MRI, these can be advantageous to having independent control of
heating and measurement coils. We describe an MRI-based method for mapping
temperature and SAR using a solenoid coil and a birdcage coil for heating and
imaging, respectively. The accuracy and quality of SAR/temperature mapping
are enhanced by separating the heating and imaging coils. The MR-based
temperature measurements were in good agreement with fiber-optic
measurements. The dual-coil heating system was simulated using the
finite-difference time-domain method. The distribution of
numerically-calculated and experimentally-acquired SAR were in good
agreement.