EM and thermal validation of a numerical elliptical birdcage at 3T in the presence of a long conductive wire

Understanding the risk of overheating in the presence of implants requires a rigorous simulation of experimental conditions. We have built a model of the whole body transmit coil in the Philips Achieva TX system. The validity of that model was verified by comparing electromagnetic and thermal simulations to phantom experiments for an ASTM phantom alone and in presence of a long copper wire. RF fields are in good agreement. Local temperature variations show similar dynamics and amplitudes. Realistic temperature simulations, as opposed to SAR simulations, provide a metric directly comparable to experimental results and thus facilitate validation.

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