Motion guidance lines for scout accelerated motion estimation and reduction (SAMER) in 2D and 3D MRI


Stephen Cauley
Martinos Center for Biomedical Imaging, MGH, Harvard Medical School


Polina Golland
Patient motion during MRI examinations causes disruptive motion
artifacts, such as image ghosting, blurring, ringing and signal
dropouts which can degrade diagnostic utility to the point where scans
must be repeated, or patients called back. We introduce the concept of
“motion guidance lines” to produce a novel acquisition and
reconstruction strategy for robust retrospective motion correction
that is minimally intrusive to clinically accepted acquisition
orderings. The extremely limited number of motion guidance lines
required to accurately guide data-consistency based motion estimation
allows for them to be excluded during reconstruction. This ensures
that SAMER will only provide improvement and an original series with
image quality/contrast and motion robustness from the standard
sequence can always be produced. Through simulation and in vivo
experiments, we demonstrate highly accurate motion estimation and
clinically acceptable computational performance for standard cartesian
2D and 3D sequences.