Floating navigator echo (FNAV) for in-plane 2D translational motion estimation

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 kx line is acquired off‐center in the phase‐encoding (ky) direction as a...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2004-02, Vol.51 (2), p.403-407
Main Authors: Kadah, Yasser M., Abaza, Ayman A., Fahmy, Ahmed S., Youssef, Abou-Bakr M., Heberlein, Keith, Hu, Xiaoping P.
Format: Article
Language:English
Subjects:
Algorithms
Computer Simulation
Image Enhancement - methods
Magnetic Resonance Imaging - methods
Motion
motion artifact
motion estimation
navigator echo
translational motion
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Summary: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 kx line is acquired off‐center in the phase‐encoding (ky) 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.
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.10704