A phase contrast pulse sequence was modified to use a single-sided bipolar encoding to calibrate the transverse gradient offsets for asymmetric gradient coils. The phase difference approach cancels the concomitant gradient field effects from all gradient waveforms except for the bipolar gradient waveforms. By fitting the measured phase offset in the phase difference images to the applied bipolar gradient amplitudes, the gradient offset value can be calculated. This was used for pre-emphasis compensation for the zeroth and first order concomitant gradient fields.
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