General Electric Company

Xiaohang Zhou

Matthew A Bernstein

Kevin Franklin King

Alexander Ganin

Norbert Joseph Pelc

Gary H Glover

Jason Andrew Polzin

Gousheng Tan

Fast spin echo pulse sequences are adjusted to reduce, or eliminate image artifacts caused by Maxwell terms arising from the linear imaging gradients. The waveforms of the slice selection, phase encoding and readout gradients are adjusted in shape, size or position to eliminate or reduce the phase error caused by the spatially quadratic Maxwell terms.

Method for reducing Maxwell term artifacts in fast spin echo MR images

A method is presented for correcting Maxwell term error artifacts produced by an NMR system during the production of either a phase contrast angiogram or a complex difference angiogram. Phase corrections are made to the reconstructed phase image to eliminate the artifacts. Correction coefficients calculated from the flow encoding magnetic gradient waveforms of the phase contrast pulse sequence are used in a polynomial to calculate a set of phase error corrections. These corrections are then used to adjust the phase at each pixel of the angiogram image.

Correction of artifacts caused by Maxwell terms in phase contrast

Artifacts in NMR images produced by Maxwell terms during non-rectilinear scans, such as spiral scans, are reduced or eliminated. Phase corrections for in-plane and through-plane blurring are used to offset Maxwell terms errors.

Correction for maxwell fields produced during non-rectilinear k-space

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Pewaukee, WI, United States of America

Xiaohang Zhou