What type of study is this?

This is a Quantitative Study study.

September 17, 2025

High-resolution 0.16-mm time-of-flight angiography at 7 T with volumetric navigators for prospective motion correction

Key Points

Volumetric navigators enable robust imaging of small vessels in the brain despite head movements.
The study shows that motion correction significantly enhances the quality of time-of-flight MRI images.
Interactions between volumetric navigators and time-of-flight sequences were closely examined for effectiveness.
This approach allows for unprecedented imaging resolution at a mesoscopic scale, highlighting the potential for in vivo applications.

Abstract

Motivation: High-resolution time-of-flight (TOF) magnetic resonance angiography (MRA) is needed for imaging the cerebral vasculature at the mesoscopic scale but is challenged by involuntary head movements during image acquisition. Goal(s): This study tests whether whole-brain volumetric navigators (vNavs), based on 3D-EPI, can be used for prospective motion correction (PMC) of thin-slab TOF acquisitions at 7T. Approach: Interactions between vNavs and TOF sequence modules are examined, and the performance of PMC is investigated under different head motion conditions. Results: While results show that vNavs affect TOF signal, vNav motion correction enables the robust imaging of small vessels. Impact: We show that slab-selective isotropic 0.16-mm TOF-MRA is feasible with whole-brain volumetric navigators for prospective head motion correction, enabling robust in vivo imaging of the human vasculature at an unprecedented scale.

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