Automatic compensation of motion artifacts in MRI
Article first published online: 29 JAN 1999
Copyright © 1999 Wiley-Liss, Inc.
Magnetic Resonance in Medicine
Volume 41, Issue 1, pages 163–170, January 1999
How to Cite
Atkinson, D., Hill, D. L.G., Stoyle, P. N.R., Summers, P. E., Clare, S., Bowtell, R. and Keevil, S. F. (1999), Automatic compensation of motion artifacts in MRI. Magn Reson Med, 41: 163–170. doi: 10.1002/(SICI)1522-2594(199901)41:1<163::AID-MRM23>3.0.CO;2-9
- Issue published online: 29 JAN 1999
- Article first published online: 29 JAN 1999
- Manuscript Accepted: 30 JUN 1998
- Manuscript Revised: 11 JUN 1998
- Manuscript Received: 17 FEB 1998
- UK Engineering and Physical Sciences Research Council. Grant Number: GR/L32965
- motion correction;
Patient motion during the acquisition of a magnetic resonance image can cause blurring and ghosting artifacts in the image. This paper presents a new post-processing strategy that can reduce artifacts due to in-plane, rigid-body motion in times comparable to that required to re-scan a patient. The algorithm iteratively determines unknown patient motion such that corrections for this motion provide the best image quality, as measured by an entropy-related focus criterion. The new optimization strategy features a multi-resolution approach in the phase-encode direction, separate successive one-dimensional searches for rotations and translations, and a novel method requiring only one re-gridding calculation for each rotation angle considered. Applicability to general rigid-body in-plane rotational and translational motion and to a range of differently weighted images and k-space trajectories is demonstrated. Motion artifact reduction is observed for data from a phantom, volunteers, and patients. Magn Reson Med 41:163-170, 1999. © 1999 Wiley-Liss, Inc.