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Elimination of nyquist ghosts in MRI by using fast linogram imaging
Author(s) -
Gai Neville,
Axel Leon
Publication year - 1997
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880070634
Subject(s) - ghosting , nyquist–shannon sampling theorem , echo planar imaging , computer science , nyquist frequency , nyquist stability criterion , sampling (signal processing) , planar , nyquist rate , computer vision , artificial intelligence , magnetic resonance imaging , physics , algorithm , medicine , radiology , mathematics , computer graphics (images) , parametric statistics , statistics , filter (signal processing)
Timing inaccuracies between the even and odd echoes lead to the formation of Nyquist ghosts in conventional (blipped) echo‐planar imaging (EPI). A fast radial scanning method based on the linogram sampling geometry was designed and implemented. No ghosting effects are seen with this scheme, and correction for timing inaccuracies is performed using simple postprocessing steps before reconstruction.