Ristic, M;
Chappell, KE;
Lanz, H;
McGinley, J;
Gupte, C;
Amiras, D;
(2025)
First in-vivo magic angle directional imaging using dedicated low-field MRI.
Magnetic Resonance in Medicine
, 93
(3)
pp. 1077-1089.
10.1002/mrm.30332.
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Abstract
Purpose: To report the first in-vivo results from exploiting the magic angle effect, using a dedicated low-field MRI scanner that can be rotated about two axes. The magic angle directional imaging (MADI) method is used to depict collagen microstructures with 3D collagen tractography of knee ligaments and the meniscus. Methods: A novel low-field MRI system was developed, based on a transverse field open magnet, where the magnet can be rotated about two orthogonal axes. Sets of volume scans at various orientations were obtained in healthy volunteers. The experiments focused on the anterior cruciate ligament (ACL) and the meniscus of the knee. The images were co-registered, anatomical regions of interest (ROIs) were selected and the collagen fiber orientations in each voxel were estimated from the observed image intensity variations. The 3D collagen tractography was superimposed on conventional volume images. Results: The MADI method was successfully employed for the first time producing in-vivo results comparable to those previously reported for excised animal specimens using conventional MRI. Tractography plots were generated for the ACL and the menisci. These results are consistent with the known microstructure of collagen fibers in these tissues. Conclusion: Images obtained using low-field MRI with 1 mm<sup>3</sup> resolution were of sufficient quality for the MADI method, which was shown to produce high quality in-vivo information of collagen microstructures. This was achieved using a cost effective and sustainable low-field magnet making the technique potentially accessible and scalable, potentially changing the way we image injuries or disease in joints.
| Type: | Article |
|---|---|
| Title: | First in-vivo magic angle directional imaging using dedicated low-field MRI |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/mrm.30332 |
| Publisher version: | https://doi.org/10.1002/mrm.30332 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Collagen, magic angle effect, musculoskeletal imaging, Humans, Anterior Cruciate Ligament, Magnetic Resonance Imaging, Adult, Male, Imaging, Three-Dimensional, Knee Joint, Diffusion Tensor Imaging, Female, Reproducibility of Results, Collagen, Equipment Design, Meniscus, Sensitivity and Specificity, Image Enhancement |
| 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 |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10217563 |
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