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Labeling geometry (left, dashed box indicates imaging slab, dashed line indicates the labeling plane); dynamic PCASL-VIPR sequence diagram (right) shows a tagging session consisting of four modules: background suppression, PCASL, FAIR, and acquisition with time assignment. In each tagging session, PCASL pulse train is set up differently (relative length of label state) according to the required acquisition (control, Frame 1-n).
