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Orbital navigator echoes for motion measurements in magnetic resonance imaging
Author(s) -
Fu Zhuo Wu,
Wang Yi,
Grimm Roger C.,
Rossman Phillip J.,
Felmlee Joel P.,
Riederer Stephen J.,
Ehman Richard L.
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.1910340514
Subject(s) - echo (communications protocol) , imaging phantom , rotation (mathematics) , physics , motion (physics) , trajectory , magnetic resonance imaging , nuclear magnetic resonance , measure (data warehouse) , orientation (vector space) , optics , computer vision , computer science , mathematics , geometry , classical mechanics , medicine , computer network , astronomy , database , radiology
A single “orbital” navigator echo, that has a circular k ‐space trajectory, is used to simultaneously measure in‐plane rotational and multi‐axis translational global motion. Rotation is determined from the shift in the magnitude profile of the echo with respect to a reference echo. Displacements are calculated from the phase difference between the current echo and a reference echo. Phantom studies show that this technique can accurately measure rotation and translations. Preliminary results from adaptive motion correction studies on phantom and human subjects indicate that the orbital navigator echo is an effective method for motion measurement in MRI.