T2-weighted Spine Imaging using a Single-Shot Turbo Spin Echo Pulse Sequence

TL;DR

This study explores a novel single-shot turbo spin echo sequence with variable flip angles for faster, higher-resolution T2-weighted spine imaging, reducing scan time and artifacts compared to traditional methods.

Contribution

The paper introduces an optimized HASTE-VFA sequence that improves spatial resolution and reduces SAR, enhancing T2 spine imaging efficiency and quality.

Findings

Improved image resolution and SNR with the proposed sequence.

Better grading scores for motion and artifact reduction.

Successful application in 29 patient cases.

Abstract

T2 weighted imaging of the spine is commonly performed using fast spin echo (FSE/TSE) based sequences, resulting in long scan times and vulnerability to motion artifacts. While single shot fast spin echo sequences have been attempted, their adoption has been limited by poor spatial resolution and specific absorption rate (SAR) limitations. We investigate the use of a half-Fourier acquisition single-shot turbo spin-echo variable flip angle (HASTE-VFA) sequence for T2 weighted spine imaging. A variable refocusing flip angle echo train was first optimized for the spine to improve the point spread function (PSF) and minimize SAR, yielding images with improved spatial resolution and signal-to-noise ratio compared to the constant flip angle sequence. Data was acquired from 29 patients (20 lumbar and thoracolumbar, 9 whole-spine) using conventional fast spin echo and the proposed variable flip angle single-shot sequences. All images were graded by two experienced neuroradiologists in a blinded fashion and scores were assigned based on blurring, motion, artifacts, and noise as well as appearance of disks, facet joints, end plates, nerve roots and the spinal cord.