3D distortion-free, reduced field of view diffusion-prepared GRE at 3T

TL;DR

This paper introduces a 3D reduced-FOV diffusion-prepared GRE sequence for spinal cord imaging at 3T, achieving distortion-free images with improved quality and comparable SNR to standard methods.

Contribution

The paper presents a novel 3D reduced-FOV diffusion-prepared GRE sequence that reduces distortion and improves image quality in spinal cord diffusion imaging.

Findings

Phantom scans confirmed the efficacy of the reduced FOV approach.

In-vivo scans showed improved image quality and reduced distortion.

ADC estimates were consistent with standard methods.

Abstract

Purpose: To develop a 3D distortion-free reduced-FOV diffusion-prepared GRE sequence and demonstrate its in-vivo application for diffusion imaging of the spinal cord in healthy volunteers. Methods: A 3D multi-shot reduced-FOV diffusion-prepared GRE (RFOV-DP-GRE) acquisition is achieved using a slice-selective tip-down pulse in the phase encoding direction in the diffusion preparation, combined with magnitude stabilisers. The efficacy of the developed reduced FOV approach and accuracy of ADC estimates were evaluated in a phantom. In addition, 5 healthy volunteers were enrolled and scanned at 3T using the proposed sequence and a standard spin echo diffusion-weighted single-shot EPI sequence (DW-SS-EPI) for spinal cord imaging. Image quality, perceived SNR and image distortion were assessed by two expert readers and quantitative measurements of apparent SNR were performed. Results: The phantom scan demonstrates the efficacy of the proposed reduced FOV approach. Consistent ADC estimates were measured with RFOV-DP-GRE when compared with DW-SS-EPI. In-vivo, RFOV-DP-GRE demonstrated improved image quality and reduced perceived distortion, while maintaining perceived SNR compared to DW-SS-EPI. Conclusion: 3D Distortion-free diffusion-prepared imaging can be achieved using the proposed sequence