Optimized 3D Single Shot Trajectories by Radial Arrangement of Individual Petals (RIP)

Benjamin Zahneisen¹, Thimo Grotz¹, Kuan J. Lee¹, Marco Reisert¹, Juergen Hennig¹

With the use of multiple localized, small receive coil arrays, single shot whole brain coverage becomes feasible for fMRI applications using undersampled reconstruction. Using a 3D-rosette trajectory and iterative, regularized reconstruction a 64 volume can be acquired in 23ms with acceptable PSF-broadening. However, the analytical rosette offers only limited degrees of freedom for optimization. In this work we present an optimized 3D single-shot trajectory based on a radial arrangement of individual petals (RIP-trajectory). Compared to the conventional rosette trajectory it has a narrower PSF, no visible sidelobes and is faster (19.3ms) and therefore less sensitive to field inhomogeneities.