Abstract #0272
An off-resonance correction method for vessel-encoded pseudo-continuous arterial spin labeling using the optimized encoding scheme
Eleanor S K Berry 1 , Peter Jezzard 1 , and Thomas W Okell 1
1
FMRIB centre, Nuffield Department of
Clinical Neurosciences, University of Oxford, Oxford,
United Kingdom
Vessel-encoded pseudo-continuous arterial spin labeling
(VEPCASL) can trace the flow patterns of individual
feeding arteries in the brain. Unipolar VEPCASL produces
a sinusoidal-like variation in inversion efficiency
across the plane where blood is labeled. In the presence
of a B0-induced frequency offset the inversion
efficiency remains constant but its spatial position is
shifted. If unaccounted for this can lead to reduced SNR
and errors in the separation of signals from different
arteries. Here we present a method that incorporates a
correction for off-resonance at the vessel locations
into a method for optimizing the encoding schemes for
multiple vessels.
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