Numerical Estimation of Peak/Average SAR Ratio for Different Thorax Models

摘要

The estimation of Specific Absorption Rate (SAR) during a Magnetic Resonance Imaging (MRI) scan is an important safety procedure. In this work, a birdcage body coil model is used for radiofrequency (RF) excitation of several inhomogeneous human thorax models with different sizes and weights. To study the peak/average SAR ratio correlation with sample metrics, numerical simulations using the Finite Difference Time Domain (FDTD) method are performed to estimate the peak and average SAR values on the entire sample volume. Results for 11 different thorax models indicate a strong correlation between the peak/average SAR value and the sample mass/height ratio.