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Test-retest reproducibility of in vivo magnetization transfer ratio and saturation index in mice at 9.4 Tesla

View ORCID ProfileNaila Rahman, Jordan Ramnarine, Kathy Xu, Arthur Brown, View ORCID ProfileCorey A. Baron
doi: https://doi.org/10.1101/2021.12.10.472129
Naila Rahman
1Centre for Functional and Metabolic Mapping (CFMM), Robarts Research Institute, University of Western Ontario, London, Ontario, Canada
2Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
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  • For correspondence: nrahma25@uwo.ca
Jordan Ramnarine
1Centre for Functional and Metabolic Mapping (CFMM), Robarts Research Institute, University of Western Ontario, London, Ontario, Canada
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Kathy Xu
3Translational Neuroscience Group, Robarts Research Institute, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
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Arthur Brown
3Translational Neuroscience Group, Robarts Research Institute, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
4Department of Anatomy and Cell Biology, University of Western Ontario, London, Ontario, Canada
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Corey A. Baron
1Centre for Functional and Metabolic Mapping (CFMM), Robarts Research Institute, University of Western Ontario, London, Ontario, Canada
2Department of Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
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Abstract

Background Magnetization transfer saturation (MTsat) imaging was developed to reduce T1 dependence and improve specificity to myelin compared to the widely used MT ratio (MTR), while maintaining a feasible scan time. Knowledge of MTsat reproducibility is necessary to apply MTsat in preclinical neuroimaging.

Purpose To assess the test-retest reproducibility of MTR and MTsat in the mouse brain at 9.4 T and calculate sample sizes required to detect various effect sizes.

Study Type Prospective

Animal Model C57Bl/6 Mouse Model (6 females and 6 males, aged 12 – 14 weeks)

Field Strength/Sequence Magnetization Transfer Imaging at 9.4 T

Assessment All mice were scanned at two timepoints (5 days apart). MTR and MTsat maps were analyzed using mean region-of-interest (ROI), and whole brain voxel-wise analysis.

Statistical Tests Bland-Altman plots assessed biases between test and retest measurements. Test-retest reproducibility was evaluated via between and within-subject coefficients of variation (CV). Sample sizes required were calculated (at a 95 % significance level and power of 80 %), given various minimum detectable effect sizes, using both between and within-subject approaches.

Results Bland-Altman plots showed negligible biases between test and retest sessions. ROI-based and voxel-wise CVs revealed high reproducibility for both MTR (ROI: CVs < 8 %) and MTsat (ROI: CVs < 10 %). With a sample size of 6, changes on the order of 15% can be detected in MTR and MTsat, both between and within subjects, while smaller changes (6 – 8 %) require sample sizes of 10 – 15 for MTR, and 15 – 20 for MTsat.

Data Conclusion MTsat exhibits comparable reproducibility to MTR, while providing sensitivity to myelin with less T1 dependence than MTR. Our findings suggest both MTR and MTsat can detect moderate changes, common in pathologies, with feasible preclinical sample sizes.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • Grant Support: The authors would like to acknowledge the Canada First Research Excellence Fund (BrainsCAN - https://brainscan.uwo.ca/); the New Frontiers in Research Fund (NFRFE-2018-01290 - https://www.sshrc-crsh.gc.ca/funding-financement/nfrf-fnfr/index-eng.aspx), awarded to CB; the Natural Sciences and Engineering Research Council of Canada: Canada Graduate Scholarships - Master’s Program (NSERC-CGS M), awarded to NR; and the Ontario Graduate Scholarship (OGS), awarded to NR, for their funding contributions.

  • https://osf.io/5nwae/

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted December 13, 2021.
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Test-retest reproducibility of in vivo magnetization transfer ratio and saturation index in mice at 9.4 Tesla
Naila Rahman, Jordan Ramnarine, Kathy Xu, Arthur Brown, Corey A. Baron
bioRxiv 2021.12.10.472129; doi: https://doi.org/10.1101/2021.12.10.472129
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Test-retest reproducibility of in vivo magnetization transfer ratio and saturation index in mice at 9.4 Tesla
Naila Rahman, Jordan Ramnarine, Kathy Xu, Arthur Brown, Corey A. Baron
bioRxiv 2021.12.10.472129; doi: https://doi.org/10.1101/2021.12.10.472129

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