Michael Bush1, Thomas Vahle2, Uday Krishnamurthy1, Thomas Benkert2, Xiaodong Zhong1, Bradley Bolster1, Paul Kennedy3, Octavia Bane3, Bachir Taouli3, and Vibhas Deshpande1
1Siemens Medical Solutions USA, Inc., Malvern, PA, United States, 2Siemens Healthcare GmbH, Erlangen, Germany, 3The Department of Radiology and Biomedical Engineering and Imaging Institute, Icahn School of Medicine at Mt. Sinai, New York, NY, United States
1Siemens Medical Solutions USA, Inc., Malvern, PA, United States, 2Siemens Healthcare GmbH, Erlangen, Germany, 3The Department of Radiology and Biomedical Engineering and Imaging Institute, Icahn School of Medicine at Mt. Sinai, New York, NY, United States
Motion vectors derived from non-rigid registration of low
b-value diffusion volumes can be used to correct for motion in higher b-values.
Initial results suggest the proposed method can produce images similar in
quality to respiratory gating, while maintaining reduced acquisition times.
Figure 1. Flow diagram of the iMoCo process.
Redundant sampling of the b50 volumes results in well-filled motion states,
allowing for accurate non-rigid registration. Motion vectors produced by the
non-rigid registration are then applied to the remaining b-value volumes, which
do not require redundant sampling.
Figure 3. Motion Phantom (MP) and Healthy Volunteer ADC
Maps (Voxel size 1.5x1.5x5.0 mm3, PAT 2, Matrix Size 128x104x35, FOV
380 mm, TR 6.1 s, TE 56 ms, b50-16 avgs, b800-16 avgs, BW 2300 Hz/Px). Motion
Phantom diffusion values are most comparable between the gold-standard Gated
and iMoCo maps.