What question did this study set out to answer?

This research aims to characterize gradient field nonuniformity and its impact on velocity encoding in phase contrast MRI.

Generalized reconstruction of phase contrast MRI: Analysis and correction of the effect of gradient field distortions

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Randomized trial analyzes the correction of gradient field distortions in phase contrast MRI, suggesting improved velocity quantification.

This research aims to characterize gradient field nonuniformity and its impact on velocity encoding in phase contrast MRI.
Developed a generalized model for accurate velocity reconstruction in PC MRI.
Utilized a matrix formalism to address gradient field deviations and spatial effects.
Performed phantom measurements to validate the correction method for velocity errors.
Errors in velocity magnitude reached up to 60%.
Velocity encoding direction errors were as significant as 45 degrees.
The proposed correction method effectively mitigated the effects of gradient field nonuniformity.

Markl et al. (2003) studied this question.

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Randomized trial analyzes the correction of gradient field distortions in phase contrast MRI, suggesting improved velocity quantification.