Sodium MRI is challenging due to its low sensitivity and short T2 and hence a three-dimensional sequence with a spiral trajectory has been applied. The spiral trajectory was shortened in the TPI method by accelerating the span at the k-space origin using a radial start and then transiting into a spiral trajectory. This popular TPI method, however, requires a very high gradient slew rate when the 3D cone approaches the polar pole. This drawback has been resolved by rotating a two-dimensional disc filled with interleaved TPI trajectories. This method achieved the faster sweeping of TPI as well as a uniform gradient slew rate over the sphere sampling. We are reporting some artifacts in TPI-based scans not only in our study but also in other studies.
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