Jerod Michael Rasmussen1, Tom Liu2,
Bryon Mueller3, Greg Brown2, Christina Wierenga2,
Gary H. Glover4
1University of California, Irvine,
Irvine, CA, United States; 2University of California, San Diego; 3University
of Minnesota; 4Stanford University
This
study uses multiple scanners to investigate the effect of varying the number
of repetitions used in CBF measurement of Gray Matter tissue (GM) and
establishes recommendations for the minimum scan time necessary for a stable
calculation. Data was combined across 2 traveling subjects studies and the
number of repetitions used for analysis ranged from 16 to 104 in control/tag
pairs. Gray Matter masked CBF statistics showed an expected inverse decrease
in noise with acquisitions and converged on a recommendation of 92
repetitions for a stable CBF measurement.