Meeting Banner
Abstract #3284

Dynamic 3D Imaging of the Free Moving Knee Using a Retrospective Self-Gated Sequence with a Quasi-Random Sampling Scheme

Daniel Ludwig Weber1, 2, Stefan Weick2, Markus Lototchi2, Sairamesh Raghuraman2, 3, Titus Lanz3, Daniel Haddad1, 2, Peter Michael Jakob, 12

1MRB Research Center for Magnetic Resonance Bavaria e.V., Wrzburg, Bavaria, Germany; 2Department of Experimental Physics 5 (Biophysics), University of Wrzburg, Wrzburg, Bavaria, Germany; 3RAPID Biomedical GmbH, Rimpar, Bavaria, Germany

Dynamic 3D imaging may provide valuable additional information in knee injuries and increases specificity of the diagnosis. A motion device was used allowing an active and thus physiological movement of the knee. For the correlation between the motion and the MR acquisition, a retrospective self-gated 3D sequence with a quasi-random sampling scheme together with a 16 channel U-shaped phased array coil was used. The upward and downward motions were differentiated using the derivative of the DC-signal. Six 3D datasets (corresponding to motion states) were reconstructed retrospectively. For the reconstruction of the images, adaptive combining and iterative GRAPPA was applied.

Abstract PDF E-Poster Video

Keywords

accuracy acquisition active actively adapted adaptive additionally among analyze applied array background bending biophysics body bone cartilage central certain channel characterization clinical close coil complex constructed correlation cycle dataset defined density derivation derivative designed device diagnosis diameter differentiated difficult distinguish distributed distribution domain downward downwards driven duration dynamic element elements enable examined example experimental feasible filters final flash frames free full funded gated gating gray guaranteed guides guiding hinge human injuries iterative joint keeping knee ligament ligaments loss manner materials missing monitoring motion moved movement moving optimizing overlap partitions passive patient peter physics physiological piston placed pneumatic pneumatics position powered process processes progress project proper quasi random randomly rapid reconstructed reconstruction repetitions reproducible resolution restricts retrospective retrospectively ruptures safe sampling satisfying scanner scheme selection self sharing sharpness snapshots space spatial specificity spin static stationary stronger system therapy tibia turning upper upward upwards valuable various ventral view visualize volunteers weber white windows