Underestimation Error in Estimating True Local SAR in Perfused Tissues in High and Ultra-High Field MRI

Underestimation error associated with the conventional measurement of local specific absorption rate (SAR) in perfused tissues is quantified as a function of local tissue perfusion and the temperature difference between local tissue and blood. Results show that this error may exceed safe local SAR thresholds, as determined by regulatory bodies. Correcting for this SAR estimation error is necessary to build and operate radiofrequency (RF) coils safely to conduct human imaging at high and ultra-high fields.

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