Real-time correction by optical tracking with integrated geometric distortion correction for reducing motion artifacts in functional MRI
Head motion artifacts are a major problem in functional MRI that limit its use in neuroscience research and clinical settings. Real-time scan-plane correction by optical tracking has been shown to correct slice misalignment and nonlinear spin-history artifacts; however, residual artifacts due to dyn...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Published: |
2013
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| _version_ | 1826281085112156160 |
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| author | Rotenberg, D Chiew, M Ranieri, S Tam, F Graham, S Chopra, R |
| author_facet | Rotenberg, D Chiew, M Ranieri, S Tam, F Graham, S Chopra, R |
| author_sort | Rotenberg, D |
| collection | OXFORD |
| description | Head motion artifacts are a major problem in functional MRI that limit its use in neuroscience research and clinical settings. Real-time scan-plane correction by optical tracking has been shown to correct slice misalignment and nonlinear spin-history artifacts; however, residual artifacts due to dynamic magnetic field nonuniformity may remain in the data. A recently developed correction technique, Phase Labeling for Additional Coordinate Encoding, can correct for absolute geometric distortion using only the complex image data from two echo planar images with slightly shifted k-space trajectories. An approach is presented that integrates Phase Labeling for Additional Coordinate Encoding into a real-time scan-plane update system by optical tracking, applied to a tissue-equivalent phantom undergoing complex motion and an functional MRI finger tapping experiment with overt head motion to induce dynamic field nonuniformity. Experiments suggest that such integrated volume-by-volume corrections are very effective at artifact suppression, with potential to expand functional MRI applications. Copyright © 2012 Wiley Periodicals, Inc. |
| first_indexed | 2024-03-07T00:23:28Z |
| format | Journal article |
| id | oxford-uuid:7d50af4b-bf31-4f71-9545-30e000a4694c |
| institution | University of Oxford |
| last_indexed | 2024-03-07T00:23:28Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | oxford-uuid:7d50af4b-bf31-4f71-9545-30e000a4694c2022-03-26T21:02:52ZReal-time correction by optical tracking with integrated geometric distortion correction for reducing motion artifacts in functional MRIJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7d50af4b-bf31-4f71-9545-30e000a4694cSymplectic Elements at Oxford2013Rotenberg, DChiew, MRanieri, STam, FGraham, SChopra, RHead motion artifacts are a major problem in functional MRI that limit its use in neuroscience research and clinical settings. Real-time scan-plane correction by optical tracking has been shown to correct slice misalignment and nonlinear spin-history artifacts; however, residual artifacts due to dynamic magnetic field nonuniformity may remain in the data. A recently developed correction technique, Phase Labeling for Additional Coordinate Encoding, can correct for absolute geometric distortion using only the complex image data from two echo planar images with slightly shifted k-space trajectories. An approach is presented that integrates Phase Labeling for Additional Coordinate Encoding into a real-time scan-plane update system by optical tracking, applied to a tissue-equivalent phantom undergoing complex motion and an functional MRI finger tapping experiment with overt head motion to induce dynamic field nonuniformity. Experiments suggest that such integrated volume-by-volume corrections are very effective at artifact suppression, with potential to expand functional MRI applications. Copyright © 2012 Wiley Periodicals, Inc. |
| spellingShingle | Rotenberg, D Chiew, M Ranieri, S Tam, F Graham, S Chopra, R Real-time correction by optical tracking with integrated geometric distortion correction for reducing motion artifacts in functional MRI |
| title | Real-time correction by optical tracking with integrated geometric distortion correction for reducing motion artifacts in functional MRI |
| title_full | Real-time correction by optical tracking with integrated geometric distortion correction for reducing motion artifacts in functional MRI |
| title_fullStr | Real-time correction by optical tracking with integrated geometric distortion correction for reducing motion artifacts in functional MRI |
| title_full_unstemmed | Real-time correction by optical tracking with integrated geometric distortion correction for reducing motion artifacts in functional MRI |
| title_short | Real-time correction by optical tracking with integrated geometric distortion correction for reducing motion artifacts in functional MRI |
| title_sort | real time correction by optical tracking with integrated geometric distortion correction for reducing motion artifacts in functional mri |
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