Purpose: To compare numerically simulated and experimentally measured temperature increase due to specific energy absorption rate from radiofrequency fields.
Methods: Temperature increase induced in both a phantom and in the human forearm when driving an adjacent circular surface coil was mapped using the proton resonance frequency shift technique of magnetic resonance thermography. The phantom and forearm were also modeled from magnetic resonance image data, and both specific energy absorption rate and temperature change as induced by the same coil were simulated numerically.
Results: The simulated and measured temperature increase distributions were generally in good agreement for the phantom. The relative distributions for the human forearm were very similar, with the simulations giving maximum temperature increase about 25% higher than measured.
Conclusion: Although a number of parameters and uncertainties are involved, it should be possible to use numerical simulations to produce reasonably accurate and conservative estimates of temperature distribution to ensure safety in magnetic resonance imaging. R01 EB006563
Keywords: MRI; PRF; SAR; safety; simulation; temperature.
Copyright © 2013 Wiley Periodicals, Inc.