What type of study is this?

This is a Experimental Study study.

September 17, 2025

Navigator-Assisted Fast Motion-Compensated Brain MRI

Key Points

The navigator-assisted method reduces the need for motion-segments while maintaining image quality.
This technique requires fewer iterations for convergence compared to baseline methods.
It allows for about 50% fewer motion-segments without compromising image quality.
Rapid motion-compensated MRI may lower costs associated with non-diagnostic images and rescans.

Abstract

Motivation: To bring motion-compensated brain MRI closer to clinical reality by reducing reconstruction times. Goal(s): Assess the impact of motion-estimation from navigators on initializing retrospective motion-compensated image reconstruction. Approach: A segmented, magnetization-prepared gradient-echo sequence was modified to include navigators. Motion parameters were estimated from the navigators and used to define motion-segments and to initialize the motion-compensated iterative reconstruction. Results: Compared to the baseline approach, the navigator-assisted approach allows to use about 50% fewer motion-segments at the same image quality and needs less than quarter of the iterations to converge. Impact: Making accurate and fast motion-compensated brain MRI without additional devices available will reduce costs associated with non-diagnostic images and resulting rescans.

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