The QUASAR reproducibility study, Part II: Results from a multi-center Arterial Spin Labeling test-retest study

Accurate repositioning between sessions was achieved with the automatic planning tool showing mean displacements of 1.87 ± 0.95 mm and rotations of 1.56 ± 0.66°. Mean gray matter CBF was 47.4 ± 7.5 [ml/100 g/min] with a between-subject standard variation SDb = 5.5 [ml/100 g/min] and a within-subject standard deviation SDw = 4.7 [ml/100 g/min]. The corresponding repeatability was 13.0 [ml/100 g/min] and was found to be within the range of previous studies.