Communication Dans Un Congrès Année : 2026

3T MRI 4D flow sequence acquisition time reduction on a vascular phantom

Résumé

This study aims to optimize 4D flow MRI of cerebral vessels by reducing scan time while preserving quantitative accuracy. A rigid internal carotid artery phantom with three aneurysms (Elastrat, Switzerland) was scanned on a 3T system using the Siemens BEAT FQ 4D flow sequence. Flow was generated by an MCP-Z pump under steady conditions. Sequences with various acceleration factors, such as reduced spatial resolution, GRAPPA, and partial Fourier, were compared to a fully sampled reference using pointwise velocity correlations (R²), with accuracy defined as at least 90% of the velocity variance explained. Acquisition time was reduced to 21s (20.6-fold). With R2 values between 0.91 and 0.97, the optimized parameter set preserved velocity information with only 23% of the variance remaining unexplained. With simulated cardiac gating (75 bpm), scan time was 4min 27s (24.6-fold reduction). The proposed acceleration framework enables rapid, accurate 4D flow MRI of cerebral vessels for potential neurovascular applications.

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Dates et versions

hal-05122463 , version 1 (20-06-2025)
hal-05122463 , version 2 (04-02-2026)

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Esther Fontaine, Nicolas Passat, Stéphanie Salmon, Antoine Mendes-Carreira, Christophe Portefaix. 3T MRI 4D flow sequence acquisition time reduction on a vascular phantom. International Symposium on Biomedical Imaging (ISBI), 2026, London, United Kingdom. ⟨10.1109/ISBI61048.2026.11515522⟩. ⟨hal-05122463v2⟩
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