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Abstract #3527

A flexible approach for correction of bipolar gradient-induced effects in fat-water separation

Jorge Campos Pazmino1, Renée-Claude Bider1, Véronique Fortier1,2, and Ives Roger Levesque1,2,3
1Medical Physics Unit, McGill University, Montreal, QC, Canada, 2McGill University Health Centre, Montreal, QC, Canada, 3Research Institute of the McGill University Centre, Montreal, QC, Canada

Synopsis

Keywords: Fat & Fat/Water Separation, Fat and Fat/Water Separation, Bipolar gradients, phase errors, amplitude modulation

Motivation: The use of bipolar readout gradients enables shorter echo spacings which are beneficial for fat-water separation. However, these gradients also induced effects that are detrimental to accurate fat-water separation.

Goal(s): To develop a novel method for correcting bipolar-induced errors without additional scans and with flexibility in choosing the fat-water separation method.

Approach: Graph-cut fat-water separation was used for joint postprocessing of odd and even echoes to correct bipolar-induced effects. The corrected data was then processed as if acquired using unipolar readouts.

Results: This approach extends existing unipolar fat-water separation techniques for use with data acquired using bipolar readout gradients.

Impact: We proposed a novel approach that corrects phase errors and amplitude modulation induced by bipolar readout gradients. The approach enables broader use of advanced fat-water separation techniques with bipolar readout gradient pulses.

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Keywords