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Navigator-Based Slice Tracking for Multiband Accelerated Liver DWI.

Ke Zhang^1,2,3,4, Simon M F Triphan^1,2,3, Congcong Fu^1,2,3

¹Department of Diagnostic & Interventional Radiology, Heidelberg University Hospital, Heidelberg, Germany.

Magnetic Resonance in Medicine

|March 24, 2026

Summary

This summary is machine-generated.

Navigator-based slice tracking (NAV) reduces respiratory motion in multiband (MB) accelerated liver diffusion-weighted imaging (DWI). This technique improves image quality, making it feasible for clinical liver DWI scans.

Keywords:

liver diffusion weighted imaging navigator‐based slice tracking prospective motion compensation

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Novel In Vivo Micro-Computed Tomography Imaging Techniques for Assessing the Progression of Non-Alcoholic Fatty Liver Disease

Novel In Vivo Micro-Computed Tomography Imaging Techniques for Assessing the Progression of Non-Alcoholic Fatty Liver Disease

Published on: March 24, 2023

Area of Science:

Medical Imaging
Radiology
Biomedical Engineering

Background:

Clinical liver diffusion-weighted imaging (DWI) is challenged by long scan times and respiratory motion.
Motion artifacts degrade image quality and limit diagnostic accuracy in liver DWI.

Purpose of the Study:

To evaluate a navigator-based slice tracking (NAV) technique for prospectively compensating respiratory motion.
To assess the impact of NAV on image quality in multiband (MB) accelerated liver DWI.

Main Methods:

A navigator acquisition at the diaphragm was used for real-time motion tracking.
Multiband accelerated DWI sequences with and without NAV were compared.
Image quality metrics including coefficient of variation (CoV), signal-to-noise ratio (SNR), and sharpness were analyzed.

Main Results:

NAV effectively computed respiratory motion, significantly reducing CoV compared to free-breathing DWI.
NAV improved SNR and liver sharpness, enhancing visualization of organ structures.
Detailed anatomical structures were better delineated in patients with lesions using NAV.

Conclusions:

Navigator-based slice tracking is a feasible technique to mitigate respiratory motion in MB accelerated liver DWI.
NAV enhances image quality and diagnostic potential for clinical liver imaging.