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Abstract #0079

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

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

1University Hospital Freiburg, Freiburg, Germany

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.