When too short a post-labeling delay (PLD) is used for ASL, intravascular artifacts can be present. This issue is amplified in multiband (MB) ASL where superior slices are acquired early in the acquisition. Here, MB pseudocontinuous ASL (pCASL) and a dual regression approach were used to analyze functional connectivity with PLD=1000ms and 1525ms. Increased whole-brain tSNR was observed for the PLD=1000ms data, but intravascular signal was present. Group connectivity was similar between PLDs, and no significant differences in mean or max z-score were seen between PLD. Thus, shorter PLDs may be appropriate for MB-ASL rsfMRI despite the presence of intravascular artifacts.
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