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Quantitative velocity images from thick slab 2D phase contrast
Author(s) -
Weber David M.,
Wang Yi,
Korosec Frank R.,
Mistretta Charles A.
Publication year - 1993
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910290210
Subject(s) - slab , laminar flow , phase (matter) , projection (relational algebra) , physics , contrast (vision) , data acquisition , optics , tracking (education) , phase contrast microscopy , computer science , mechanics , algorithm , geophysics , psychology , pedagogy , quantum mechanics , operating system
Thick slab two‐dimensional phase contrast (2D PC) angiography provides a large amount of anatomical information in a short acquisition time. Quantitative velocity information is, however, destroyed by the necessary projection dephasing gradient. We present a 2D PC acquisition scheme which retains quantitative velocity information in a thick slab acquisition. A thick slab acquisition produces an image which is a projection through an entire vessel. Accurate velocity measurements must take into account the intravoxel phase cancellation caused by a distribution of velocities within the vessel. In addition to the description of the data acquisition scheme, we outline a method for determining the mean velocity within a vessel having a laminar flow distribution. It is shown that without the consideration for intravoxel phase cancellation, the mean velocity measurement from thick slab images overestimates the true mean velocity by 10%.