Kilian Stumpf1, Hanna Frantz1, Patrick Metze1, Thomas Hüfken1, Tobias Speidel1, and Volker Rasche1
1Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
1Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
An
image-based self-gating approach is applied to MR acquisitions of the eye using
tiny golden angle profile ordering, allowing the reconstruction of images free
of motion artifacts without the use of external tracking devices.
Figure 1: A) SG signal derived from the tracking of the ON position
and the ON diameter for both eyes. The bins for two ON positions are marked in
yellow with the reconstructed images being presented in Fig. 3. B) Scout image
in axial orientation with visible ON (solid arrow), EOMS (dashed arrows) and
orbital fat (dotted arrows) and two exemplary lines (green) on which the
location of the ON is calculated and tracked.
Figure 3: Images resulting from reconstruction of profiles (A)
without SG, (B) with SG from the bin for centre location of the ON and (C) with
SG from the bin for ‘looking left’ as determined by the SG signal in Fig 1. While
motion blur of the ON (solid arrow) is clearly visible in A, the image-based SG
approach enables the reconstruction of images in various motion phases with
reduced motion blur (solid arrows in B,C) and allows e.g. the visualization of
an EOM contraction (striped arrow in C).
