Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
Clin Radiol. 2012 Feb;67(2):106-13. doi: 10.1016/j.crad.2011.06.011. Epub 2011 Dec 3.
To compare three-dimensional (3D) isotropic T2-weighted magnetic resonance imaging (MRI) sequences and reformation with two-dimensional (2D) T2-weighted sequences regarding image quality of the cervical spine at 3T.
A phantom study was performed using a water-filled cylinder. The signal-to-noise and image homogeneity were evaluated. Fourteen (n=14) volunteers were examined at 3T using 3D isotropic T2-weighted sagittal and conventional 2D T2-weighted sagittal, axial, and oblique sagittal MRI. Multiplanar reformation (MPR) of the 3D T2-weighted sagittal dataset was performed simultaneously with image evaluation. In addition to artefact assessment, the visibility of anatomical structures in the 3D and 2D sequences was qualitatively assessed by two radiologists independently. Cohen's kappa and Wilcoxon signed rank test were used for the statistical analysis.
The 3D isotropic T2-weighted sequence resulted in the highest signal-to-noise ratio (SNR) and lowest non-uniformity (NU) among the sequences in the phantom study. Quantitative evaluation revealed lower NU values of the cerebrospinal fluid (CSF) and muscles in 2D T2-weighted sagittal sequences compared to the 3D volume isotropic turbo spin-echo acquisition (VISTA) sequence. The other NU values revealed no statistically significant difference between the 2D turbo spin-echo (TSE) and 3D VISTA sequences (0.059<p<0.959). 3D VISTA images showed significantly fewer CSF flow artefacts (p<0.001) and better delineated intradural nerve rootlets (p=0.001) and neural foramina (p=0.016) compared to 2D sequences.
A 3D T2 weighted sequence is superior to conventional 2D sequences for the delineation of intradural nerve rootlets and neural foramina and is less affected by CSF flow artefacts.
比较 3 种各向同性三维（3D）T2 加权磁共振成像（MRI）序列与 2 种二维（2D）T2 加权序列在 3T 颈椎成像的图像质量。
采用充满水的圆柱状模型进行了一项影像学研究。评估了信噪比和图像均匀性。对 14 例志愿者在 3T 进行了 3D 各向同性 T2 加权矢状位和传统 2D T2 加权矢状位、轴位和斜矢状位 MRI 检查。同时对 3D T2 加权矢状位数据集进行多平面重建（MPR）并进行图像评估。除了对伪影进行评估外，两位放射科医生还独立对 3D 和 2D 序列中解剖结构的可视性进行了定性评估。采用 Cohen's kappa 和 Wilcoxon 符号秩检验进行统计学分析。
在模型研究中，3D 各向同性 T2 加权序列产生的信噪比（SNR）最高，非均匀性（NU）最低。定量评估显示，2D T2 加权矢状位序列中脑脊液（CSF）和肌肉的 NU 值低于 3D 容积各向同性涡轮自旋回波采集（VISTA）序列。其他 NU 值在 2D 涡轮自旋回波（TSE）和 3D VISTA 序列之间无统计学显著差异（0.059<p<0.959）。与 2D 序列相比，3D VISTA 图像显示 CSF 流动伪影明显减少（p<0.001），硬膜内神经根和神经孔的轮廓也更好（p=0.001 和 p=0.016）。
与传统 2D 序列相比，3D T2 加权序列更有利于硬膜内神经根和神经孔的描绘，且较少受到 CSF 流动伪影的影响。
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