Correction of concomitant magnetic field‐induced image artifacts in nonaxial echo‐planar imaging

Yiping P. Du; Xiaohong Joe Zhou; Matt A. Bernstein

doi:10.1002/mrm.10249

journal article Aug 23, 2002

Correction of concomitant magnetic field‐induced image artifacts in nonaxial echo‐planar imaging

Yiping P. Du Xiaohong Joe Zhou

Matt A. Bernstein

Magnetic Resonance in Medicine Vol. 48 No. 3 pp. 509-515 · Wiley

View at Publisher Save 10.1002/mrm.10249

Abstract

AbstractEcho‐planar images acquired in nonaxial planes are often distorted. Such image distortion has limited the applications of the echo‐planar imaging (EPI) technique. In this article, it is demonstrated that a considerable amount of the distortion is caused by the higher‐order magnetic field concomitant with the linear magnetic field gradient, or the concomitant magnetic field. The image distortion caused by the concomitant magnetic field is more prominent when a higher gradient amplitude is used for readout. It is also shown that the concomitant magnetic field can cause ghosting and blurring. A theoretical analysis is performed for the concomitant field effect in nonaxial EPI images. A point‐by‐point (or line‐by‐line) phase correction algorithm is developed to correct the image distortion, ghosting, and blurring. A postreconstruction processing algorithm is also developed to correct image distortion with much higher computational efficiency. Experimental results show that both correction methods effectively reduce the image distortion in coronal or sagittal images. Magn Reson Med 48:509–515, 2002. © 2002 Wiley‐Liss, Inc.

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References

Details

Published: Aug 23, 2002
Vol/Issue: 48(3)
Pages: 509-515
License: View

Authors

Cite This Article

Yiping P. Du, Xiaohong Joe Zhou, Matt A. Bernstein (2002). Correction of concomitant magnetic field‐induced image artifacts in nonaxial echo‐planar imaging. Magnetic Resonance in Medicine, 48(3), 509-515. https://doi.org/10.1002/mrm.10249

Correction of concomitant magnetic field‐induced image artifacts in nonaxial echo‐planar imaging

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