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On the cause of increased aliasing in the slice‐select direction in 3D contrast‐enhanced magnetic resonance angiography
Author(s) -
Wilman Alan H.,
Riederer Stephen J.
Publication year - 2000
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 - 10.1002/1522-2594(200008)44:2<336::aid-mrm23>3.0.co;2-d
Subject(s) - aliasing , flip angle , contrast (vision) , perpendicular , magnetic resonance angiography , magnetic resonance imaging , nuclear magnetic resonance , electromagnetic coil , materials science , physics , angiography , optics , nuclear medicine , computer science , radiology , mathematics , medicine , geometry , computer vision , filter (signal processing) , quantum mechanics
The combination of short repetition times and large flip angles typically used in 3D contrast‐enhanced magnetic resonance angiography (3D CE MRA) can significantly alter the expected shape of the slab profile for unenhanced tissues, which can cause increased aliasing in the slice select direction. In this work, this increased slice select aliasing is demonstrated and explained from both theoretical and experimental points of view. The effect is due to the Ernst angle of unenhanced background tissue occurring on the falling edges of the flip angle profile that has been set for the significantly reduced T 1 of contrast‐enhanced blood. The deleterious aliasing effects are magnified substantially when the chosen volume is placed close to surface coil reception with the slice select direction perpendicular to the coil axis. Magn Reson Med 44:336–338, 2000. © 2000 Wiley‐Liss, Inc.