Coherence and Interference in Ultrafast RARE Experiments

David G. Norris, Peter Bornert

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The mechanisms of echo formation in U-FLARE experiments are described and the conditions for interference between echo pathways formulated. Three possible solutions to this problem are identified and demonstrated, namely coherent U-FLARE, in which all echoes add constructively, displaced U-FLARE, in which one echo parity is shifted out of the acquisition window, and phase-cycled U-FLARE, in which a two-step phase cycle is used to differentiate between echoes according to their parity. The relative merits and applications of each are discussed.

Original languageEnglish
Pages (from-to)123-127
Number of pages5
JournalJournal of Magnetic Resonance - Series A
Issue number2
Publication statusPublished - 1993
Externally publishedYes


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