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Phase‐sensitive cardiac tagging—REALTAG
Author(s) -
Derbyshire J. Andrew,
Sampath Smita,
McVeigh Elliot R.
Publication year - 2007
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.21264
Subject(s) - steady state free precession imaging , spins , computer science , contrast (vision) , precession , algorithm , phase (matter) , physics , resolution (logic) , nuclear magnetic resonance , artificial intelligence , medicine , quantum mechanics , astronomy , magnetic resonance imaging , radiology , condensed matter physics
Fully inverting spins, instead of merely saturating them, provides superior contrast for tagging procedures. The resulting improvement in tag contrast‐to‐noise ratio (CNR) yields higher‐precision tag detection. Also, thinner slices and hence reduced tag separations can be employed, providing displacement and strain measurements with better spatial resolution. Alternatively, the improved tag contrast can be used to obtain cine images covering a greater portion of the cardiac cycle. The use of standard magnitude reconstruction for images of these inversion tags causes rectification of the negative‐valued signals from the tags, confounding the image interpretation. Therefore, a phase‐sensitive reconstruction scheme of the inverted tags must be employed. Here we demonstrate the implementation of inverted tags with phase‐sensitive reconstruction in a ramped‐flip‐angle, steady‐state free precession (SSFP) sequence. Magn Reson Med 58:206–210, 2007. © 2007 Wiley‐Liss, Inc.