Variations in peak local SAR due to coupling comparison between various pTx array simulation methods

This study compared three methods of Parallel Transmission array simulation, namely, A) Ideally decoupled method, B) Coupled method and C) Field superposition method using S-parameters and calculated peak 10gm average SAR (pk-10gmAvgSAR) for 5000 random amplitude and phase combinations in two adult human models for a 4-channel pTx array coil. The results suggest that compared to Coupled method, both Ideally decoupled and Field superposition methods underestimate the pk-10gmAvgSAR for about 80% of times, hence it is crucial to include coupling in pTx array simulations. Since field superposition method can both under- and over-estimate the pk-10gmAvgSAR, it is better to perform simulations again with optimum capacitor values being incorporated into the simulation model.

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