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A Nyquist Modulated Echo‐to‐View Mapping Scheme for Fast Spin‐Echo Imaging
Author(s) -
Keller Paul J.,
Heiserman Joseph E.,
Fram Evan K.,
Rand Scott D.,
Drayer Burton P.
Publication year - 1995
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.1910330615
Subject(s) - echo (communications protocol) , signal (programming language) , physics , energy (signal processing) , spin echo , nyquist–shannon sampling theorem , sampling (signal processing) , nuclear magnetic resonance , k space , computer science , optics , magnetic resonance imaging , computer vision , fourier transform , medicine , computer network , quantum mechanics , detector , radiology , programming language
A new scheme for assignment of echoes to views in fast spin‐echo imaging was developed. The scheme places early and late echoes in alternating lines of the periphery of k ‐space; continued alternation of echoes arising closer to the middle of the echo train encodes the central portion of k ‐space. The scheme has two effects: a) The echo‐to‐echo signal decay that usually gives rise to multiple faint ghosts, now yields a single Nyquist ghost that is removed by phase over‐sampling. b) Mapping earlier echoes (and thus more energy) to the periphery of k ‐space yields sharper edges.