Skip to main content
Figure 1 | Journal of Cardiovascular Magnetic Resonance

Figure 1

From: Velocity spectrum imaging using radial k-t SPIRiT

Figure 1

a) Dynamic Golden-angle acquisition providing an optimal distritbution of radial profiles [S.Winkelmann,IEEETransMedIm(26),2007]. D relates the reconstructed Cartesian k-t data, x, to the measured k-t points, y. b) Every Cartesian k-t sample point is expressed as linear combination of neighboring points in dynamic k-t space across all coils. c) The shift-invariant interpolation kernel weights (indicated by the arrows in the green neighborhood-mask) in G are obtained by fitting them to the fully sampled k-t calibration area in a Tikhonov-regularized least-squares sense. d) Unconstrained Lagrangian, where I denotes identity and λ a regularization parameter. The latter was set to 0.125.

Back to article page