Radio-frequency pulse design in parallel transmission under strict temperature constraints

Although it seems that there is a general consensus that temperature is the true relevant safety parameter, tracking the SAR in MR exams and in RF pulse design has remained the gold standard, likely due to simplicity reasons. Here we investigate numerically a parallel transmission RF pulse design algorithm under strict temperature constraints. With the example of a 10 min TOF sequence at 7T, we show that the SAR guidelines in this instance can be quite conservative and that more performance at UHF thus is within reach through the use of these thermo-regulated pulses.

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