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Floating navigator echo (FNAV) for in‐plane 2D translational motion estimation
Author(s) -
Kadah Yasser M.,
Abaza Ayman A.,
Fahmy Ahmed S.,
Youssef AbouBakr M.,
Heberlein Keith,
Hu Xiaoping P.
Publication year - 2004
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.10704
Subject(s) - computer science , translational motion , motion (physics) , encoding (memory) , echo (communications protocol) , line (geometry) , phase (matter) , computer vision , artificial intelligence , algorithm , motion estimation , physics , mathematics , geometry , computer network , classical mechanics , quantum mechanics
A modification of the classical navigator echo (NAV) technique is presented whereby both 2D translational motion components are computed from a single navigator line. Instead of acquiring the NAV at the center of the k ‐space, a k x line is acquired off‐center in the phase‐encoding ( k y ) direction as a floating NAV (FNAV). It is shown that the translational motion in both the readout and phase‐encoding directions can be computed from this line. The algorithm used is described in detail and verified experimentally. The new technique can be readily implemented to replace classic NAV in MRI sequences, with little to no additional cost or complexity. The new method can help suppress 2D translational motion and provide more accurate motion estimates for other motion‐suppression techniques, such as the diminishing variance algorithm. Magn Reson Med 51:403–407, 2004. © 2004 Wiley‐Liss, Inc.