  Purpose: To develop a method for banding-free bSSFP cardiac cine with
substantially reduced flow artifacts.
  Methods: A projection-reconstruction (PR) trajectory is proposed for a
frequency-modulated cine sequence, facilitating reconstruction of three phase
cycles and a field-map time series from a short, breath-held scan. Data is also
acquired during the gradient rewinders to enable generation of field maps using
BMART, B$_0$ mapping using rewinding trajectories, where the rewind data forms
the second TE image for calculating the field map. A field-map-based
combination method is developed which weights the phase-cycle component images
to include only passband signal in the final cine images, and exclude stopband
and near-band flow artifacts.
  Results: The weights derived from the BMART-generated field maps mask out
banding and near-band flow artifacts in and around the heart. Therefore, the
field-map-based phase-cycle combination, which is facilitated by the PR
acquisition with BMART, results in more homogeneous blood pools and reduced
hyperintense regions than root-sum-of-squares.
  Conclusion: With the proposed techniques, using a non-Cartesian trajectory
for a frequency-modulated cine sequence enables flow-artifact-reduced
banding-free cardiac imaging within a short breath-hold.
