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Selection of high‐definition 2D virtual profiles with multiple RF pulse excitations along interleaved echo‐planar k ‐space trajectories
Author(s) -
Panych Lawrence P.,
Oshio Koichi
Publication year - 1999
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/(sici)1522-2594(199902)41:2<224::aid-mrm2>3.0.co;2-g
Subject(s) - excitation , traverse , k space , pulse (music) , nuclear magnetic resonance , physics , signal (programming language) , echo (communications protocol) , flip angle , radio frequency , planar , field (mathematics) , optics , computational physics , computer science , magnetic resonance imaging , mathematics , fourier transform , telecommunications , geology , medicine , computer network , computer graphics (images) , geodesy , quantum mechanics , detector , pure mathematics , radiology , programming language
A method for spatially selective excitation of 2D RF profiles is reported. The method makes use of multiple shots to traverse interleaved echo‐planar trajectories in 2D k space during each RF pulse excitation. Results from each of the interleaved excitations are summed, with the net effect being the excitation of a virtual profile. The method allows for the excitation of high‐definition 2D profiles with standard gradient hardware. Signal to noise is enhanced by a factor equal to the square root of the number of interleaved excitations, compared with a single‐shot excitation. Potential applications for volume‐localized spectroscopy, functional MRI, and high‐resolution reduced‐field‐of‐view imaging are discussed. Magn Reson Med 41:224–229, 1999. © 1999 Wiley‐Liss, Inc.