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Further improvements in the flock sequence
Author(s) -
Carpenter Katharine A.,
Reynolds William F.,
Yang JiPing,
Enriquez Raul G.
Publication year - 1992
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260301309
Subject(s) - flock , chemistry , decoupling (probability) , phase (matter) , sensitivity (control systems) , sequence (biology) , filter (signal processing) , analytical chemistry (journal) , veterinary medicine , chromatography , computer science , computer vision , electronic engineering , medicine , biochemistry , organic chemistry , control engineering , engineering
The phase cycle for the FLOCK experiment was modified to provide improved suppression of artifacts and improved signal‐to‐noise ratios. An alternative version of FLOCK in which the initial BIRD pulse during t 1 is replaced by a one‐step J filter is shown to give comparable performance, while a phase‐sensitive version of FLOCK shows the expected \documentclass{article}\pagestyle{empty}\begin{document}$ \sqrt 2 $\end{document} increase in sensitivity. Finally, while it is shown that phase‐sensitive FLOCK without decoupling during acquisition can be used to measure n J (C,H) ( n ≤ 2), there are serious limitations to this approach.