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European Radiology
Erschienen in:

10.06.2024 | Special Report

Optimizing timing for quantification of intracranial aneurysm enhancement: a multi-phase contrast-enhanced vessel wall MRI study

verfasst von: Xiao Li, Jianjian Zhang, Jin Zhang, Lingling Wang, Jiaqi Tian, Hui Tang, Mahmud Mossa-Basha, Bing Zhao, Jieqing Wan, Jianrong Xu, Yan Zhou, Beibei Sun, Huilin Zhao, Chengcheng Zhu

Erschienen in: European Radiology | Ausgabe 12/2024

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Abstract

Objectives

Aneurysm wall enhancement (AWE) on high-resolution contrast-enhanced vessel wall MRI (VWMRI) is an emerging biomarker for intracranial aneurysms (IAs) stability. Quantification methods of AWE in the literature, however, are variable. We aimed to determine the optimal post-contrast timing to quantify AWE in both saccular and fusiform IAs.

Materials and methods

Consecutive patients with unruptured IAs were prospectively recruited. VWMRI was acquired on 1 pre-contrast and 4 consecutive post-contrast phases (each phase was 9 min). Signal intensity values of cerebrospinal fluid (CSF) and aneurysm wall on pre- and 4 post-contrast phases were measured to determine the aneurysm wall enhancement index (WEI). AWE was also qualitatively analyzed on post-contrast images using previous grading criteria. The dynamic changes of AWE grade and WEI were analyzed for both saccular and fusiform IAs.

Results

Thirty-four patients with 42 IAs (27 saccular IAs and 15 fusiform IAs) were included. The changes in AWE grade occurred in 8 (30%) saccular IAs and 6 (40%) in fusiform IAs during the 4 post-contrast phases. The WEI of fusiform IAs decreased 22.0% over time after contrast enhancement (p = 0.009), while the WEI of saccular IAs kept constant during the 4 post-contrast phases (p > 0.05).

Conclusions

When performing quantitative analysis of AWE, acquiring post-contrast VWMRI immediately after contrast injection achieves the strongest AWE for fusiform IAs. While the AWE degree is stable for 36 min after contrast injection for saccular IAs.

Clinical relevance statement

The standardization of imaging protocols and analysis methods for AWE will be helpful for imaging surveillance and further treatment decisions of patients with unruptured IAs.

Key Points

  • Imaging protocols and measurements of intracranial aneurysm wall enhancement are reported heterogeneously.
  • Aneurysm wall enhancement for fusiform intracranial aneurysms (IAs) is strongest immediately post-contrast, and stable for 36 min for saccular IAs.
  • Future multi-center studies should investigate aneurysm wall enhancement as an emerging marker of aneurysm growth and rupture.
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Metadaten
Titel
Optimizing timing for quantification of intracranial aneurysm enhancement: a multi-phase contrast-enhanced vessel wall MRI study
verfasst von
Xiao Li
Jianjian Zhang
Jin Zhang
Lingling Wang
Jiaqi Tian
Hui Tang
Mahmud Mossa-Basha
Bing Zhao
Jieqing Wan
Jianrong Xu
Yan Zhou
Beibei Sun
Huilin Zhao
Chengcheng Zhu
Publikationsdatum
10.06.2024
Verlag
Springer Berlin Heidelberg
Erschienen in
European Radiology / Ausgabe 12/2024
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-024-10827-z

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