Does phase contrast MRI provide the mean velocity of the spins within a voxel?
Eduardo G. Gonzalez 1 and Joao L. A. Carvalho 1
Department of Electrical Engineering,
University of Brasilia, Brasilia, DF, Brazil
The underlying assumption with phase contrast (PC) is
that all spins within a voxel move at the same velocity.
This assumption is broken if the voxel is partially
occupied by static spins or located at the viscous
sublayer, or if the flow is complex or turbulent. We
show that PC measurements may be accurately modeled as
the mean velocity of all spins within each voxel. The
proposed model, based on the spatial-velocity
distribution of spins, could be useful towards bettering
our understanding of partial volume effects in PC MRI
velocimetry, especially if T
in-flow enhancement, and noise are incorporated.
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