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Echo-planar imaging with prospective slice-by-slice motion correction using active markers
| Content Provider | Scilit |
|---|---|
| Author | Ooi, Melvyn B. Krueger, Sascha Thomas, William J. Brown, Truman R. |
| Copyright Year | 2011 |
| Description | Journal: Magnetic Resonance in Medicine Head motion is a fundamental problem in functional magnetic resonance imaging and is often a limiting factor in its clinical implementation. This work presents a rigid-body motion correction strategy for echo-planar imaging sequences that uses micro radiofrequency coil "active markers" for real-time, slice-by-slice prospective correction. Before the acquisition of each echo-planar imaging-slice, a short tracking pulse-sequence measures the positions of three active markers integrated into a headband worn by the subject; the rigid-body transformation that realigns these markers to their initial positions is then fed back to dynamically update the scan-plane, maintaining it at a fixed orientation relative to the head. Using this method, prospectively-corrected echo-planar imaging time series are acquired on volunteers performing in-plane and through-plane head motions, with results demonstrating increased image stability over conventional retrospective image-realignment. The benefit of this improved image stability is assessed in a blood oxygenation level dependent functional magnetic resonance imaging application. Finally, a non-rigid-body distortion-correction algorithm is introduced to reduce the remaining signal variation. |
| Related Links | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3122130/pdf |
| Ending Page | 81 |
| Page Count | 9 |
| Starting Page | 73 |
| e-ISSN | 15222594 |
| DOI | 10.1002/mrm.22780 |
| Journal | Magnetic Resonance in Medicine |
| Issue Number | 1 |
| Volume Number | 66 |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2011-02-24 |
| Access Restriction | Open |
| Subject Keyword | Journal: Magnetic Resonance in Medicine Radiology, Nuclear Medicine and Imaging Functional Magnetic Resonance Imaging Motion Correction Geometric Distortion |
| Content Type | Text |
| Resource Type | Article |
