Recommended Implementation of Arterial Spin Labeled Perfusion MRI for Clinical Applications: A consensus of the ISMRM Perfusion Study Group and the European Consortium for ASL in Dementia

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Magn Reson Med. 2015 Jan; 73(1): 102–116.

Published online 2014 Apr 8. doi: 10.1002/mrm.25197

Table 3

Values to be used in quantification of ASL data (see Section 6)

Parameter	Value
λ (blood-brain partition coefficient)	0.9 ml/g (74)
T_{1, blood} at 3.0 Tesla	1650 ms (10)
T_{1, blood} at 1.5 Tesla	1350 ms (75)
α (labeling efficiency) for PCASL	0.85 (17)
α (labeling efficiency) for PASL	0.98 (19)