title: k-t BLAST reconstruction from non-Cartesian k-t space sampling.
abstract: Current implementations of k-t Broad-use Linear Acqusition Speed-up Technique (BLAST) require the sampling in k-t space to conform to a lattice. To permit the use of k-t BLAST with non-Cartesian sampling, an iterative reconstruction approach is proposed in this work. This method, which is based on the conjugate gradient (CG) method and gridding reconstruction principles, can efficiently handle data that are sampled along non-Cartesian trajectories in k-t space. The approach is demonstrated on prospectively gated radial and retrospectively gated Cartesian imaging. Compared to a sliding window (SW) reconstruction, the resulting image series exhibit lower artifact levels and improved temporal fidelity. The proposed approach thus allows investigators to combine the specific advantages of non-Cartesian imaging or retrospective gating with the acceleration provided by k-t BLAST.
authors.affiliation: Institute for Biomedical Engineering, Swiss Federal Institute of Technology, ETH, Zurich, Switzerland. msh@mr.au.dk
authors.forename: Michael S
authors.initials: MS
authors.lastname: Hansen
authors.forename: Christof
authors.initials: C
authors.lastname: Baltes
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Tsao
authors.forename: Sebastian
authors.initials: S
authors.lastname: Kozerke
authors.forename: Klaas P
authors.initials: KP
authors.lastname: Pruessmann
authors.forename: Holger
authors.initials: H
authors.lastname: Eggers
mesh_terms: D016477:Artifacts; D005240:Feasibility Studies; D006321:Heart / Q000033:anatomy & histology*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*