Castella, R;
Arn, L;
Dupuis, E;
Callaghan, MF;
Draganski, B;
Lutti, A;
(2018)
Controlling motion artefact levels in MR images by suspending data acquisition during periods of head motion.
Magnetic Resonance in Medicine
, 80
(6)
pp. 2415-2426.
10.1002/mrm.27214.
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Abstract
PURPOSE: Head movements are a major source of MRI artefacts. Prospective motion correction techniques significantly improve data quality, but strong motion artefacts may remain in the data. We introduce a framework to suspend data acquisition during periods of head motion over a predefined threshold. METHODS: Data was acquired with prospective motion correction and an external optical tracking system. A predictor of motion impact was introduced that accounts for the amplitude of the signal acquired at the time of the motion. From this predictor, a threshold was defined to trigger the suspension of data acquisition during periods of motion. The framework was tested on 5 subjects, 2 motion behaviors, and 2 head coils (20 and 64 channels). RESULTS: The best improvements in data quality were obtained for a threshold value of 0, equivalent to suspending the acquisition based on head speed alone, at the cost of a long prolongation of scan time. For threshold values ∼3.5e-4 , image quality was largely preserved, and prolongation of scan time was minimal. Artefacts occasionally remained with the 64-channel head coil for all threshold values, seemingly due to head movement in the sharp sensitivity profile of this coil. CONCLUSION: The proposed suspension strategy is more efficient than relying on head speed alone. The threshold for suspension of data acquisition governs the tradeoff between image degradation due to motion and prolonged scan time, and can be tuned by the user according to the desired image quality and participant's tolerability.
| Type: | Article |
|---|---|
| Title: | Controlling motion artefact levels in MR images by suspending data acquisition during periods of head motion |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/mrm.27214 |
| Publisher version: | https://doi.org/10.1002/mrm.27214 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | MRI artefacts, acquisition suspension, head movement, multi-parameter mapping, prospective motion correction, quantitative MRI |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Imaging Neuroscience |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10048502 |
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