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Abstract #3088

Calibration of Concomitant Field Compensation using Phase Contrast MRI

Thomas K.F. Foo1, Louis Frigo2, Myung-Ho In3, Nastaren Abad1, Vincent B Ho4, and Matt A Bernstein3
1GE Research, Niskayuna, NY, United States, 2GE Healthcare, Waukesha, WI, United States, 3Mayo Clinic, Rochester, MN, United States, 4Uniformed Services University of the Health Sciences, Bethesda, MD, United States

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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