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Floating Navigator Echo for In-Plane Translational Motion Estimation Yasser M. Kadah', Ayman A. Abaza', Abou-Bakr M. Youssef', Keith Heberlein2and Xiaoping Hu2
 

Summary: Floating Navigator Echo for In-Plane Translational Motion Estimation
Yasser M. Kadah', Ayman A. Abaza', Abou-Bakr M. Youssef', Keith Heberlein2and Xiaoping Hu2
'Biomed.Eng. Dept., Cairo University, and 'Dept. of Radiology, University of Minnesota
Abstract
We propose a new technique in which the navigator echo is taken
at an arbitrary location in k-space. The new technique acquires
the same line in k-space in each two consecutive sets of lines.
Unlike the classical formulation, we show that the translational
motion in both the read-out and phase encoding directions can be
computed from this repeated line. This also allows the
implementationof navigator echo to be simpler and echo time to
be shorter since the k-space line location for the navigator echo
adheres to the acquiredportion of k-space.
Introduction
Motion of patient during MR acquisition causes severe
artifacts in the reconstructed images. Among the most
successful techniques used to suppress such artifacts is the
navigator echo technique (1). The original formulation
relies on acquiring an extra line in the center of k-space
along the k, or ky directions to detect motion in that

  

Source: Abaza, Ayman - West Virginia High Technology Consortium Foundation.

 

Collections: Computer Technologies and Information Sciences