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Diffusion MRI abnormalities in adolescent rats given repeated mild traumatic brain injury

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posted on 2023-05-26, 00:01 authored by RC Wortman, A Meconi, KJ Neale, Rhys D Brady, Stuart McDonaldStuart McDonald, BR Christie, DK Wright, SR Shultz

Objective: Mild traumatic brain injury (mTBI) is a serious health concern in the adolescent population. Repeated mTBI may result in more pronounced deficits, and has been associated with long-term neurological consequences including neurodegeneration. As such, there is a critical need for the development of objective mTBI biomarkers to help guide medical management. Diffusion-weighted imaging (DWI) is an advanced magnetic resonance imaging (MRI) technique that may detect brain abnormalities after mTBI. Diffusion tensor imaging (DTI) is the most commonly applied DWI method, and initial studies have reported DTI changes in mTBI patients. Furthermore, new DWI methods (e.g., track-weighted imaging; TWI) are being developed that may also be sensitive to mTBIs, but remain to be comprehensively studied. Methods: This study utilized the Awake Closed Head Injury (ACHI) model of mTBI to investigate changes in DTI and TWI following repeated mTBI in adolescent male and female rats. A total of four ACHI impacts, two/day over two consecutive days, were delivered beginning on postnatal day 25. At 1 day and 7 days postinjury, rats were euthanized and brains were collected for DWI analyses. Results: Rats given repeated mTBI displayed changes in fractional anisotropy and radial diffusivity (i.e., DTI measures), as well as track density (i.e., TWI). Interpretation: These findings are consistent with initial DTI findings in mTBI patients, suggest that TWI may complement DTI, support the utility of DWI measures as biomarkers in mTBI, and further validate the ACHI rat model of mTBI.

Funding

RCW and AM were supported by Canadian Institutes of Health Research graduate fellowships. The studies were funded by grants from NSERC and CFI to BRC, and the Australian NHMRC to SRS.

History

Publication Date

2018-12-01

Journal

Annals of Clinical and Translational Neurology

Volume

5

Issue

12

Pagination

11p. (p. 1588-1598)

Publisher

Wiley Periodicals, Inc on behalf of American Neurological Association

ISSN

2328-9503

Rights Statement

© 2018 The Authors.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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