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Statistical analyses of motion-corrupted MRI relaxometry data computed from multiple scans

Corbin, Nadège; Oliveira, Rita; Raynaud, Quentin; Di Domenicantonio, Giulia; Draganski, Bogdan; Kherif, Ferath; Callaghan, Martina F; (2023) Statistical analyses of motion-corrupted MRI relaxometry data computed from multiple scans. Journal of Neuroscience Methods , Article 109950. 10.1016/j.jneumeth.2023.109950. Green open access

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Abstract

Background: Consistent noise variance across data points (i.e. homoscedasticity) is required to ensure the validity of statistical analyses of MRI data conducted using linear regression methods. However, head motion leads to degradation of image quality, introducing noise heteroscedasticity into ordinary-least square analyses. New method: The recently introduced QUIQI method restores noise homoscedasticity by means of weighted least square analyses in which the weights, specific for each dataset of an analysis, are computed from an index of motion-induced image quality degradation. QUIQI was first demonstrated in the context of brain maps of the MRI parameter R2 * , which were computed from a single set of images with variable echo time. Here, we extend this framework to quantitative maps of the MRI parameters R1, R2 * , and MTsat, computed from multiple sets of images. Results: QUIQI restores homoscedasticity in analyses of quantitative MRI data computed from multiple scans. QUIQI allows for optimization of the noise model by using metrics quantifying heteroscedasticity and free energy. Comparison with existing methods: QUIQI restores homoscedasticity more effectively than insertion of an image quality index in the analysis design and yields higher sensitivity than simply removing the datasets most corrupted by head motion from the analysis. Conclusion: QUIQI provides an optimal approach to group-wise analyses of a range of quantitative MRI parameter maps that is robust to inherent homoscedasticity.

Type: Article
Title: Statistical analyses of motion-corrupted MRI relaxometry data computed from multiple scans
Location: Netherlands
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jneumeth.2023.109950
Publisher version: https://doi.org/10.1016/j.jneumeth.2023.109950
Language: English
Additional information: © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Heteroscedasticity, Statistical group analysis, Quantitative MRI, Motion corruption
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/10175718
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