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A new T 2 preparation technique for ultrafast gradient‐echo sequence
Author(s) -
Parrish Todd,
Hu Xiaoping
Publication year - 1994
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.1910320515
Subject(s) - gradient echo , sequence (biology) , ultrashort pulse , echo (communications protocol) , pulse sequence , nuclear magnetic resonance , computer science , physics , materials science , chemistry , magnetic resonance imaging , optics , medicine , radiology , laser , computer network , biochemistry
The T 2 , contrast in images obtained with driven equilibrium (90° x −180° x −90° x ) prepared ultrafast gradient‐echo sequences is compromised by the longitudinal magnetization build‐up after the second 90° x pulse, which does not carry T 2 information. This paper describes a new T 2 contrast preparation technique for ultrafast gradient‐echo sequence that suppresses the signal arising from the build‐up. By dephasing in the preparation and rephasing in the acquisition of the gradient echoes, the new technique eliminates signals that are not dictated by the T 2 contrast in a driven‐equilibrium approach. Consequently, it generates an image that is essentially T 2 ‐weighted. Phantom and in vivo experiments were conducted to validate the technique and to demonstrate its clinical utility. These studies indicate that the technique works properly and can be used for in vivo studies.