David Dawei Ding1, Jia Guo2, Eric
C. Wong3,4
1School of Medicine, University of
California - San Diego, La Jolla, CA, United States; 2Department
of Bioengineering, University of California - San Diego, La Jolla, CA, United
States; 3Department of Radiology, University of California - San
Diego, La Jolla, CA; 4Department of Psychiatry, University of
California - San Diego, La Jolla , CA, United States
This
study measures the distribution of brain arterial blood velocity. Five
subjects were scanned using velocity selective ASL. The velocity cut off of
the image acquisition was held constant at 2cm/sec while the velocity cut off
of the tag was 2, 4, 8, 16, 32, and 64cm/sec. The arterial blood fraction in
each velocity bin was calculated, and showed that 60% of the blood flow is
below 32cm/sec, with about 10% above 64 cm/sec. This data may help to
optimize the design of velocity selective inversion pulses, and may be useful
in the study of cerebral vascular physiology.