Department of Radiology, Shandong Medical Imaging Research Institute Affiliated to Shandong University, Jinan, Shandong, China; Department of Radiology, The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China; Shanghai Key Laboratory of Embryo Original Diseases, Shanghai, China.
Department of Radiology, The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China; Shanghai Key Laboratory of Embryo Original Diseases, Shanghai, China.
Magn Reson Imaging. 2020 Jun;69:57-64. doi: 10.1016/j.mri.2020.03.004. Epub 2020 Mar 20.
In magnetic resonance (MR) fetal imaging, the image quality acquired by the traditional Cartesian-sampled breath-hold T1-weighted (T1W) sequence may be degraded by motion artifacts arising from both mother and fetus. The radial VIBE sequence is reported to be a viable alternative to conventional Cartesian acquisition for both pediatric and adult MR, yielding better image quality. This study evaluated the role of radial VIBE in fetal MR imaging and compared its image quality and motion artifacts with those of the Cartesian T1W sequence.
We included 246 pregnant women with 50 lesions on 1.5-T MR imaging. Image quality and lesion conspicuity were evaluated by two radiologists, blinded to the acquisition schemes used, using a five-point scale, where a higher score indicated a better trajectory method. Mixed-model analysis of variance and interobserver variability assessment were performed.
The radial VIBE sequence showed a significantly better performance than conventional T1W imaging in the head and neck, fetal body, and placenta region: 3.92 ± 0.88 vs 3 ± 0.74, p < 0.001, 3.8 ± 0.94 vs 3.15 ± 0.87, p < 0.001, and 4.17 ± 0.63 vs 3.12 ± 0.72, p < 0.001, respectively. Additionally, fewer motion artifacts were observed in all regions with the radial VIBE sequence (p < 0.01). Of 50 lesions, 49 presented better lesion conspicuity on radial VIBE images than on T1W images (4.34 ± 0.91 vs 3.48 ± 1.46, p < 0.001).
For fetal imaging, the radial VIBE sequences yielded better image quality and lesion conspicuity, with fewer motion artifacts, than conventional breath-hold Cartesian-sampled T1W sequences.
在磁共振（MR）胎儿成像中，由于母亲和胎儿的运动伪影，传统的笛卡尔采样屏气 T1 加权（T1W）序列获得的图像质量可能会降低。径向 VIBE 序列被报道为儿科和成人 MR 的传统笛卡尔采集的可行替代方案，可获得更好的图像质量。本研究评估了径向 VIBE 在胎儿 MR 成像中的作用，并比较了其图像质量和运动伪影与笛卡尔 T1W 序列的图像质量和运动伪影。
我们纳入了在 1.5T MR 成像上有 50 个病变的 246 名孕妇。两位放射科医生对图像质量和病变显示度进行了评估，他们对所使用的采集方案不知情，使用五分制评分，分数越高表示轨迹方法越好。进行了混合模型方差分析和观察者间变异性评估。
与传统的 T1W 成像相比，径向 VIBE 序列在头颈部、胎儿身体和胎盘区域的表现明显更好：3.92±0.88 与 3±0.74，p<0.001，3.8±0.94 与 3.15±0.87，p<0.001，以及 4.17±0.63 与 3.12±0.72，p<0.001。此外，在所有区域，径向 VIBE 序列观察到的运动伪影更少（p<0.01）。在 50 个病变中，49 个病变在径向 VIBE 图像上的病变显示度优于 T1W 图像（4.34±0.91 与 3.48±1.46，p<0.001）。
对于胎儿成像，与传统的屏气笛卡尔采样 T1W 序列相比，径向 VIBE 序列的图像质量和病变显示度更好，运动伪影更少。
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