Rigid-body motion correction with self-navigation MRI

• Published in: Magnetic resonance in medicine Vol. 61; no. 3; pp. 739 - 747
• Main Authors: Mendes, Jason, Kholmovski, Eugene, Parker, Dennis L.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01.03.2009
• Subjects: Algorithms; Brain - anatomy & histology; Humans; Image Enhancement - methods; Image Interpretation, Computer-Assisted - methods; Magnetic Resonance Imaging - methods; Motion; motion artifact suppression; motion detection; Movement; navigation; Pattern Recognition, Automated - methods; Reproducibility of Results; Sensitivity and Specificity; TSE sequences
• ISSN: 0740-3194; 1522-2594; 1522-2594
• DOI: 10.1002/mrm.21883

The use of phase correlation to detect rigid‐body translational motion is reviewed and applied to individual echotrains in turbo‐spin‐echo data acquisition. It is shown that when the same echotrain is acquired twice, the subsampled correlation provides an array of delta‐functions, from which the motion that occurred between the acquisitions of the two echotrains can be measured. It is shown further that a similar correlation can be found between two sets of equally spaced measurements that are adjacent in k‐space. By measuring the motion between all adjacent pairs of k‐space subgroups, the complete motion history of a subject can be determined and the motion artifacts in the image can be corrected. Some of the limiting factors in using this technique are investigated with turbo‐spin‐echo head and hand images. Magn Reson Med, 2009. © 2008 Wiley‐Liss, Inc.