title: High temporal resolution retrospective motion correction with radial parallel imaging.
abstract: A method for motion correction in multicoil imaging applications, involving both data collection and reconstruction, is presented. A bit-reversed radial acquisition scheme, in conjunction with a rapid self-calibrated parallel imaging method, Generalized auto-calibrating partial parallel acquisition (GRAPPA) operator for wider radial bands (GROWL), is used to achieve motion correction at a high temporal resolution. View-by-view in-plane motion correction is achieved in 2D imaging, while 3D motion correction is achieved for every two consecutive slice-encoding planes in 3D imaging. In the proposed technique, GROWL contributes in two aspects: First, a central k-space circle/cylinder used as the motion-free reference is generated from a small number of radial lines/planes; Second, undersampled k-space regions resulting from rotation and inconsistent (e.g. intraview and nonrigid body) motion can be filled in. When compared with navigator-based motion correction methods, the proposed method does not prolong scan time and can be applied to short-TR sequences. Magn Reson Med, 2011. © 2011 Wiley-Liss, Inc.
authors.affiliation: Invivo Corporation, Philips Healthcare, Gainesville, FL, USA. wei.lin2@philips.com
authors.forename: Wei
authors.initials: W
authors.lastname: Lin
authors.forename: Feng
authors.initials: F
authors.lastname: Huang
authors.forename: George R
authors.initials: GR
authors.lastname: Duensing
authors.forename: Arne
authors.initials: A
authors.lastname: Reykowski
mesh_terms: D016477:Artifacts; D001931:Brain Mapping / Q000379:methods*; D003198:Computer Simulation; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009038:Motion; D012399:Rotation; D013997:Time Factors