Shirani Shapoor, Mousavi Najmeh-Sadat, Talib Milad Ali, Bagheri Mohammad Ali, Jazayeri Gharebagh Elahe, Hameed Qasim Abdulsahib Jaafar, Dehghani Sadegh
Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran.
Department of Radiology, College of Health and Medical Technologies, Al-Ayen University, Nasiriyah, Thi-Qar, Iraq.
Int J Biomed Imaging. 2024 Oct 11;2024:2244875. doi: 10.1155/2024/2244875. eCollection 2024.
Three-dimensional gradient-echo (3D-GRE) sequences provide isotropic or nearly isotropic 3D images, leading to better visualization of smaller structures, compared to two-dimensional (2D) sequences. The aim of this study was to prospectively compare 2D and 3D-GRE sequences in terms of key imaging metrics, including signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), glenohumeral joint space, image quality, artifacts, and acquisition time in shoulder joint images, using 1.5-T MRI scanner. Thirty-five normal volunteers with no history of shoulder disorders prospectively underwent a shoulder MRI examination with conventional 2D sequences, including - and -weighted fast spin echo (T/Tw FSE) as well as proton density-weighted FSE with fat saturation (PD-FS) followed by 3D-GRE sequences including VIBE, TRUEFISP, DESS, and MEDIC techniques. Two independent reviewers assessed all images of the shoulder joints. Pearson correlation coefficient and intra-RR were used for reliability test. Among 3D-GRE sequences, TRUEFISP showed significantly the best CNR between cartilage-bone (31.37 ± 2.57, < 0.05) and cartilage-muscle (13.51 ± 1.14, < 0.05). TRUEFISP also showed the highest SNR for cartilage (41.65 ± 2.19, < 0.01) and muscle (26.71 ± 0.79, < 0.05). Furthermore, 3D-GRE sequences showed significantly higher image quality, compared to 2D sequences ( < 0.001). Moreover, the acquisition time of the 3D-GRE sequences was considerably shorter than the total acquisition time of PD-FS sequences in three orientations ( < 0.01). 3D-GRE sequences provide superior image quality and efficiency for evaluating articular joints, particularly in shoulder imaging. The TRUEFISP technique offers the best contrast and signal quality, making it a valuable tool in clinical practice.
与二维（2D）序列相比，三维梯度回波（3D - GRE）序列可提供各向同性或近乎各向同性的三维图像，从而能更好地显示较小结构。本研究的目的是使用1.5 - T磁共振成像（MRI）扫描仪，在前瞻性比较二维和三维梯度回波序列在关键成像指标方面的差异，这些指标包括信噪比（SNR）、对比噪声比（CNR）、盂肱关节间隙、图像质量、伪影以及肩关节图像的采集时间。35名无肩部疾病史的正常志愿者前瞻性地接受了肩部MRI检查，先采用常规二维序列，包括T2加权快速自旋回波（T2/T2w FSE）以及脂肪饱和质子密度加权快速自旋回波（PD - FS），随后采用包括容积内插体部检查（VIBE）、稳态自由进动快速成像（TRUEFISP）、驱动平衡傅里叶变换采集（DESS）和多回波数据图像组合（MEDIC）技术的三维梯度回波序列。两名独立的评估者对所有肩关节图像进行评估。采用Pearson相关系数和组内相关系数（intra - RR）进行可靠性测试。在三维梯度回波序列中，TRUEFISP在软骨与骨之间（31.37±2.57，P < 0.05）以及软骨与肌肉之间（13.51±1.14，P < 0.05）的对比噪声比显著最佳。TRUEFISP在软骨（41.65±2.19，P < 0.01）和肌肉（26.71±0.79，P < 0.05）方面也显示出最高的信噪比。此外，与二维序列相比，三维梯度回波序列的图像质量显著更高（P < 0.001）。而且，三维梯度回波序列在三个方向上的采集时间明显短于PD - FS序列的总采集时间（P < 0.01）。三维梯度回波序列在评估关节，尤其是肩部成像方面，提供了卓越的图像质量和效率。TRUEFISP技术具有最佳的对比度和信号质量，使其成为临床实践中的一种有价值的工具。
