Tiny Golden Angles: A Small Surrogate for the Radial Golden Angle Profile Order

In golden angle radial MRI a constant azimuthal radial profile spacing of 111.246... guarantees a nearly uniform azimuthal profile distribution in k-space for an arbitrary number of radial profiles and was recently used in various real-time imaging methods. However, in combination with balanced SSFP sequences the large azimuthal angle increment may lead to strong image artifacts, due to the varying eddy currents introduced by the rapidly switching gradient scheme. We introduce a sequence of smaller angles (49.750, 32.039... , 27.198... , 23.628..., ... ), based on a generalized Fibonacci sequence, that guarantee the same sampling efficiency as the golden angle.

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