Controlling motion artefact levels in MR images by suspending data acquisition during periods of head motion.

Détails

ID Serval
serval:BIB_413FE1A102B3
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Controlling motion artefact levels in MR images by suspending data acquisition during periods of head motion.
Périodique
Magnetic resonance in medicine
Auteur⸱e⸱s
Castella R., Arn L., Dupuis E., Callaghan M.F., Draganski B., Lutti A.
ISSN
1522-2594 (Electronic)
ISSN-L
0740-3194
Statut éditorial
Publié
Date de publication
12/2018
Peer-reviewed
Oui
Volume
80
Numéro
6
Pages
2415-2426
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
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.
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).
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 <sup>-4</sup> , 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.
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.
Mots-clé
MRI artefacts, acquisition suspension, head movement, multi-parameter mapping, prospective motion correction, quantitative MRI
Pubmed
Web of science
Open Access
Oui
Création de la notice
26/04/2018 16:57
Dernière modification de la notice
03/10/2019 9:34
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