Table 2. The average GM CBF (in mL/100 g/min) in the quantifiable ASL and PET scans and the tSNRs of the five different ASL scans, both evaluated at subject level (mean±s.d.).

	PET CBF	AccASL	Single VS-ASL	Dual VS-ASL	pCASL no crush	pCASL crush
GM CBF	47.1±6.5			46.7±4.1	60.7±10.9	49.2±9.2
tSNR		6.96±1.42	5.04±0.85	3.49±0.50	8.40±1.41	7.05±1.19

Abbreviations: AccASL, acceleration-selective arterial spin labeling; GM CBF, gray matter cerebral blood flow; pCASL, pseudo-continuous ASL; PET, positron emission tomography; tSNRs, temporal signal-to-noise ratios; VS-ASL, velocity-selective ASL.