Motion compensated projection reconstruction.
Over recent years, MRI has shown the capability for real-time applications. Although the acquisition times of fast MRI methods have been reduced significantly, patient motion during a magnetic resonance imaging (MRI) examination still causes artifacts in the image. In this paper, the effects of motion in MRI using a radial acquisition scheme are examined. It is shown that motion can be estimated without the use of additional measurement, based on the acquired projections only. A new reconstruction technique is introduced that integrates a motion compensation algorithm into the MR-reconstruction process, resulting in a significant reduction of blurring artifacts in the reconstructed images. The proposed method is applied to different kinds of motion such as kinetic joint studies.
Schäffter
T
T
Philips Research Laboratories, Division Technical Systems, Hamburg, Germany. T.Schaeffter@pfh.research.philips.com
Rasche
V
V
Carlsen
I C
IC
D000465:Algorithms; D016477:Artifacts; D005240:Feasibility Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007719:Knee Joint / Q000033:anatomy & histology / Q000502:physiology; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008954:Models, Biological; D009068:Movement; D013997:Time Factors; D014955:Wrist Joint / Q000033:anatomy & histology / Q000502:physiology