Abstract
Purpose
This study aimed to evaluate new quantitative parameters of aneurysm wall enhancement (AWE) on magnetic resonance vessel wall imaging (VWI) in differentiating between the stable and evolving unruptured intracranial aneurysms (UIAs).
Methods
Thirty-eight consecutive patients with UIAs (27 stable and 11 evolving) underwent VWI with contrast-enhanced 3D T1 volume isotropic turbo spin echo acquisition. The voxel-based enhancement maps were created using pre- and post-contrast images. The aneurysmal lumen with signal suppression by black-blood method was segmented. Then, one voxel outer and inner layers of the lumen contour were automatically segmented. The shape features of the aneurysms and AWE of the two layers were compared between stable and evolving groups.
Results
The shape features, including aneurysm volume, surface, and compacity were significantly different between the stable and evolving groups (P = 0.024, 0.028, and 0.033, respectively). Stable and evolving groups also differed significantly in the AWE at the union of outer and inner layers of the aneurysm wall (P = 0.0082) but not in that of the outer or inner layer alone. Multivariate logistic regression analysis revealed significant differences in aneurysm volume, surface, and AWE at the union of outer and inner layers between the two groups (P = 0.0029, 0.0092, and 0.0033, respectively). Receiver operating characteristics curve analysis revealed that the area under the curve of the logistic regression model was 0.89.
Conclusion
Quantitative combined analysis of aneurysm shape features and AWE of the union of outer and inner layers were effective for differentiating between stable and evolving UIAs.
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Abbreviations
- AWE:
-
Aneurysm wall enhancement
- UIA:
-
Unruptured intracranial aneurysm
- VISTA:
-
Volume isotropic turbo spin echo acquisition
- VWI:
-
Vessel wall imaging
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Acknowledgements
The authors thank Hiroaki Shimizu and Kenichi Higuchi in Tohoku University for their kind support.
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Conceptualization: [Naoko Mori], [Hidenori Endo]; methodology: [Shunji Mugikura], [Naoko Mori]; formal analysis and investigation: [Kuniyasu Niizuma], [Shunsuke Omodaka]; writing—original draft preparation: [Naoko Mori], [Hidenori Endo]; writing—review and editing: [Naoko Mori], [Teiji Tominaga]; Funding acquisition: [Naoko Mori]; resources: [Hidenori Endo], [Teiji Tominaga], [Kei Takase]; supervision: [Teiji Tominaga].
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Endo, H., Mori, N., Mugikura, S. et al. Quantitative assessment of microstructural evolution of intracranial aneurysm wall by vessel wall imaging. Neuroradiology 64, 1343–1350 (2022). https://doi.org/10.1007/s00234-021-02877-7
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DOI: https://doi.org/10.1007/s00234-021-02877-7