A balanced SSFP (bSSFP) phase-contrast using a spiral readout was implemented for quantitative flow measurements at 0.55T. bSSFP flow is challenging at 1.5T and 3T due to off-resonance. However, at 0.55T, this sequence exploits the improved field inhomogeneity for a long readout (TR = 7.2ms) bSSFP spiral acquisition. This sequence provided improved signal-to-noise ratio (SNR) normalized by voxel, especially during diastole (Cartesian gradient echo SNR/voxel = 3.6, spiral bSSFP SNR/voxel = 9.4), to produce quality flow measurements at 0.55T.
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