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Abstract #3628

Pseudo-Polar trajectories achieve high acceleration rates with high image fidelity: experiments at 3T and 7T

Ali Ersoz 1 and L Tugan Muftuler 2,3

1 Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin, United States, 2 Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin, United States, 3 Center for Imaging Research, Medical College of Wisconsin, Milwaukee, Wisconsin, United States

Conventional radial imaging requires interpolation onto Cartesian grid, which might degrade image quality. Pseudo-Polar Fourier Transform (PPFT) is a direct, exact and fast transformation between the k-space data in pseudo-polar (PP) grid and image in Cartesian grid. In this study, we incorporated GRAPPA into PPFT reconstruction and compared it with the conventional radial GRAPPA using simulations, 3T phantom experiments and 7T human experiments. Both simulation and experimental results demonstrated that PP trajectory provides images with significantly reduced reconstruction errors and sharper edge resolution compared to conventional radial trajectory even at high acceleration rates.

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