Using the axis of rotation of polar navigator echoes to rapidly measure 3D rigid-body motion.

@article{Costa2005UsingTA,
  title={Using the axis of rotation of polar navigator echoes to rapidly measure 3D rigid-body motion.},
  author={Andreu F Costa and Daniel W Petrie and Yeen Peng Yen and Maria Drangova},
  journal={Magnetic resonance in medicine},
  year={2005},
  volume={53 1},
  pages={
          150-8
        }
}
An improved technique to prospectively correct three-dimensional rigid-body motion using polar spherical navigator (pNAV) echoes is presented. The technique is based on acquiring pNAVs of an object in a baseline and rotated position and determining the axis of rotation (AOR) between data sets, thereby reducing 3D rotations to a 2D, planar rotation. Finding the AOR is simplified by prerotating the baseline trajectory, which forces the axis to lie within a specific polar region of a spherical… CONTINUE READING
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