Combined prospective and retrospective correction to reduce motion-induced image misalignment and geometric distortions in EPI
Corresponding Author
Melvyn B. Ooi
Department of Radiology, Stanford University, Stanford, California, USA
Department of Radiology, Columbia University, New York, New York, USA
Stanford University, Lucas Center, 1201 Welch Road, Stanford, CA 94305===Search for more papers by this authorJordan Muraskin
Department of Biomedical Engineering, Columbia University, New York, New York, USA
Search for more papers by this authorXiaowei Zou
Department of Biomedical Engineering, Columbia University, New York, New York, USA
Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, South Carolina, USA
Search for more papers by this authorWilliam J. Thomas
Department of Radiology, Columbia University, New York, New York, USA
Search for more papers by this authorMurat Aksoy
Department of Radiology, Stanford University, Stanford, California, USA
Search for more papers by this authorRoland Bammer
Department of Radiology, Stanford University, Stanford, California, USA
Search for more papers by this authorTruman R. Brown
Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, South Carolina, USA
Search for more papers by this authorCorresponding Author
Melvyn B. Ooi
Department of Radiology, Stanford University, Stanford, California, USA
Department of Radiology, Columbia University, New York, New York, USA
Stanford University, Lucas Center, 1201 Welch Road, Stanford, CA 94305===Search for more papers by this authorJordan Muraskin
Department of Biomedical Engineering, Columbia University, New York, New York, USA
Search for more papers by this authorXiaowei Zou
Department of Biomedical Engineering, Columbia University, New York, New York, USA
Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, South Carolina, USA
Search for more papers by this authorWilliam J. Thomas
Department of Radiology, Columbia University, New York, New York, USA
Search for more papers by this authorMurat Aksoy
Department of Radiology, Stanford University, Stanford, California, USA
Search for more papers by this authorRoland Bammer
Department of Radiology, Stanford University, Stanford, California, USA
Search for more papers by this authorTruman R. Brown
Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, South Carolina, USA
Search for more papers by this authorAbstract
Despite rigid-body realignment to compensate for head motion during an echo-planar imaging time-series scan, nonrigid image deformations remain due to changes in the effective shim within the brain as the head moves through the B0 field. The current work presents a combined prospective/retrospective solution to reduce both rigid and nonrigid components of this motion-related image misalignment. Prospective rigid-body correction, where the scan-plane orientation is dynamically updated to track with the subject's head, is performed using an active marker setup. Retrospective distortion correction is then applied to unwarp the remaining nonrigid image deformations caused by motion-induced field changes. Distortion correction relative to a reference time-frame does not require any additional field mapping scans or models, but rather uses the phase information from the echo-planar imaging time-series itself. This combined method is applied to compensate echo-planar imaging scans of volunteers performing in-plane and through-plane head motions, resulting in increased image stability beyond what either prospective or retrospective rigid-body correction alone can achieve. The combined method is also assessed in a blood oxygen level dependent functional MRI task, resulting in improved Z-score statistics. Magn Reson Med, 2013. © 2012 Wiley Periodicals, Inc.
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