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Single breath‐hold whole‐heart MRA using variable‐density spirals at 3t
Author(s) -
Santos Juan M.,
Cunningham Charles H.,
Lustig Michael,
Hargreaves Brian A.,
Hu Bob S.,
Nishimura Dwight G.,
Pauly John M.
Publication year - 2006
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.20765
Subject(s) - undersampling , aliasing , artifact (error) , shim (computing) , spiral (railway) , computer science , image quality , multislice , artificial intelligence , mathematics , nuclear magnetic resonance , physics , medicine , image (mathematics) , mathematical analysis , erectile dysfunction
Abstract Multislice breath‐held coronary imaging techniques conventionally lack the coverage of free‐breathing 3D acquisitions but use a considerably shorter acquisition window during the cardiac cycle. This produces images with significantly less motion artifact but a lower signal‐to‐noise ratio (SNR). By using the extra SNR available at 3 T and undersampling k ‐space without introducing significant aliasing artifacts, we were able to acquire high‐resolution fat‐suppressed images of the whole heart in 17 heartbeats (a single breath‐hold). The basic pulse sequence consists of a spectral‐spatial excitation followed by a variable‐density spiral readout. This is combined with real‐time localization and a real‐time prospective shim correction. Images are reconstructed with the use of gridding, and advanced techniques are used to reduce aliasing artifacts. Magn Reson Med, 2006. © 2006 Wiley‐Liss, Inc.