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Flow‐compensated limited flip angle MR angiography
Author(s) -
Lee James N.,
Riederer Stephen J.,
Pelc Norbert J.
Publication year - 1989
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.1910120102
Subject(s) - flip angle , subtraction , signal (programming language) , carotid bifurcation , image quality , flow (mathematics) , dynamic range , artifact (error) , image subtraction , computer science , range (aeronautics) , materials science , physics , nuclear magnetic resonance , biomedical engineering , computer vision , magnetic resonance imaging , image processing , radiology , mathematics , image (mathematics) , medicine , binary image , arithmetic , stenosis , mechanics , programming language , composite material
A method of subtraction angiography that has an acquisition time of 8 s per slice is described. Flow‐compensated and uncompensated measurements are acquired in an interleaved fashion using limited flip angles and gradient refocusing. Magnitude images are reconstructed and subtracted to generate the angiogram. Results were generated in vivo in the imaging of the carotid bifurcation of several human volunteers. Susceptibility and inhomogeneity induced artifacts are prominent in thick slices, but can be greatly reduced by imaging several thin slices and adding them together. Thin slices do not require de‐phasing gradients to reduce the dynamic range, and there is no signal cancellation in overlapping vessels. The method is ideal for acquiring scout angiograms, and with averaging may produce images of diagnostic quality. © 1989 Academic Press, Inc.