Farzi, M. orcid.org/0000-0003-4663-2110, Coveney, S. orcid.org/0000-0002-7134-3196, Afzali, M. orcid.org/0000-0003-3378-0878 et al. (7 more authors) (2023) Measuring cardiomyocyte cellular characteristics in cardiac hypertrophy using diffusion‐weighted MRI. Magnetic Resonance in Medicine, 90 (5). pp. 2144-2157. ISSN 0740-3194
Abstract
<jats:sec><jats:title>Purpose</jats:title><jats:p>This paper presents a hierarchical modeling approach for estimating cardiomyocyte major and minor diameters and intracellular volume fraction (ICV) using diffusion‐weighted MRI (DWI) data in ex vivo mouse hearts.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>DWI data were acquired on two healthy controls and two hearts 3 weeks post transverse aortic constriction (TAC) using a bespoke diffusion scheme with multiple diffusion times (), q‐shells and diffusion encoding directions. Firstly, a bi‐exponential tensor model was fitted separately at each diffusion time to disentangle the dependence on diffusion times from diffusion weightings, that is, b‐values. The slow‐diffusing component was attributed to the restricted diffusion inside cardiomyocytes. ICV was then extrapolated at using linear regression. Secondly, given the secondary and the tertiary diffusion eigenvalue measurements for the slow‐diffusing component obtained at different diffusion times, major and minor diameters were estimated assuming a cylinder model with an elliptical cross‐section (ECS). High‐resolution three‐dimensional synchrotron X‐ray imaging (SRI) data from the same specimen was utilized to evaluate the biophysical parameters.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>Estimated parameters using DWI data were (control 1/control 2 vs. TAC 1/TAC 2): major diameter—17.4 m/18.0 m versus 19.2 m/19.0 m; minor diameter—10.2 m/9.4 m versus 12.8 m/13.4 m; and ICV—62%/62% versus 68%/47%. These findings were consistent with SRI measurements.</jats:p></jats:sec><jats:sec><jats:title>Conclusion</jats:title><jats:p>The proposed method allowed for accurate estimation of biophysical parameters suggesting cardiomyocyte diameters as sensitive biomarkers of hypertrophy in the heart.</jats:p></jats:sec>
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2023 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | biophysical models; cardiac microstructure mapping; diffusion-weighted MRI; synchrotron X-ray imaging |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Medicine and Health (Leeds) > School of Medicine (Leeds) > Leeds Institute of Cardiovascular and Metabolic Medicine (LICAMM) > Biomedical Imaging Science Dept (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Computing (Leeds) The University of Leeds > Faculty of Medicine and Health (Leeds) > School of Medicine (Leeds) > Leeds Institute of Medical Research (LIMR) > Division of Pathology and Data Analytics |
Funding Information: | Funder Grant number Wellcome Trust 219536/Z/19/Z |
Depositing User: | Symplectic Publications |
Date Deposited: | 03 Apr 2024 10:27 |
Last Modified: | 03 Apr 2024 10:27 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1002/mrm.29775 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:211084 |