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. 2019 Nov 22;19(4):294–309. doi: 10.2463/mrms.rev.2019-0096

Fig. 6.

Fig. 6

Simplified diagrams of vessel-selective pCASL labeling module and examples of the resultant spatial modulation shape of the labeling efficiency: (a) “bipolar approach” in which Gxy is applied alternately positive and negative, and (b) “unipolar approach” in which Gxy is kept in positive without alternation.