Efficient Off-Resonance Corrected Reconstruction of Rosette Trajectories by Deformed Interpolation Kernels

Marco Reisert¹, Jürgen Hennig¹, Thimo Grotz¹, Benjamin Zahneisen¹

Using a 3D rosette trajectory and iterative, regularized reconstruction a 64³ volume can be acquired in less than 30ms. Single shot trajectories suffer from off-resonance effects because of their long readout times. Common off-resonance correction methods approximate the phase map by a time segmentation to correct for these effects but slow down the reconstruction. We therefore have developed an off-resonance correction, which uses an approximation in space rather than in time by deforming k-space interpolation kernels leading to a speed up of a factor of 10 at comparable reconstruction quality.