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. Author manuscript; available in PMC: 2020 Jan 1.
Published in final edited form as: Magn Reson Med. 2018 Jul 29;81(1):258–274. doi: 10.1002/mrm.27381

FIG. 4.

FIG. 4

Translational and rotational motion trajectories recorded from the EM tracking system during a volunteer scan (Subject 5) with no intentional motion and corresponding FIDnav motion estimates; arrows denote swallowing events. FIDnav translational measures are in excellent agreement with EM tracking, whilst an additional drift is observed in the FIDnav tracking estimates for in-plane rotation. Swallowing events introduce small errors in FIDnav motion estimation due to the assumption of rigid-body motion.