Figure 4:

SAR reduction through the use of SAR aware algorithm (IMPULSE) vs (a) SAR-unaware (interleaved greedy and local) algorithm. Further SAR reduction is obtained by designing the two pulses for the two slices jointly (c) instead of independently (b). Note that with the independent design the peak local SAR for each pulse is less than the corresponding peak local SAR for each pulse with the joint design but the total SAR of the two pulses is lower with the joint design than with the independent design because the SAR distributions are optimized to reduce constructive summation.