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Two‐point interference method for suppression of ghost artifacts due to motion
Author(s) -
Xiang QingSan,
Bronskill Michael J.,
Henkelman R. Mark
Publication year - 1993
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.1880030618
Subject(s) - ghosting , interference (communication) , weighting , point (geometry) , computer science , computer vision , artificial intelligence , energy (signal processing) , motion (physics) , point target , algorithm , mathematics , physics , acoustics , telecommunications , statistics , synthetic aperture radar , channel (broadcasting) , geometry
A two‐point interference method is introduced for suppression of ghosting due to motion in magnetic resonance imaging. The method requires only two time‐interleaved data acquisitions, without any monitoring of the motion. A postprocessing technique is used to produce a weighted sum of the two acquired images, in which ghosts are suppressed by interference through an automatic regional tuning procedure. The appropriate complex weighting factors are regionally chosen by minimizing the “gradient energy”, which is defined as the sum of squared pixel values in the partial‐derivative maps. The method was tested in both phantoms and volunteers with a variety of imaging protocols. The level of ghost suppression with the two‐point method was found to be comparable to that of the three‐point method described previously by the authors.