Four-dimensional flow-sensitive MRI of the thoracic aorta: 12-versus 32-channel coil arrays
Four-dimensional flow-sensitive MRI of the thoracic aorta: 12-versus 32-channel coil arrays
复制标题
胸主动脉四维血流敏感 MRI：12 通道与 32 通道线圈阵列
DOI：
10.1002/jmri.22633
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发表时间：
2012-01-01
影响因子：
4.4
通讯作者：
Li, Kuncheng
中科院分区：
文献类型：
--
作者：
Stalder, Aurelien F.;Dong, Zhiyuan;Li, Kuncheng
目的：材料和方法：11名健康志愿者在3 T条件下，采用GRAPPA（12通道线圈，R = 2;（ii）12通道线圈，R = 3;（iii）32通道线圈，R = 3。定量分析包括信噪比，剩余速度发散和长度和曲率的痕迹（流线和轨迹），用于三维流动可视化。此外，半定量图像分级进行评估质量的相位对比血管造影和3D flow visualization.Results：并行成像与加速因子R = 3允许节省19.5 +/- 5%的测量时间相比，R = 2（14.2 +/- 2.4分钟）。与12通道和R = 3相比，使用R = 2的12通道和R = 3的32通道采集产生的数据具有显著（P < 0.05）更高的质量。12通道R = 2和32通道R = 3之间没有显著差异，但对于主动脉上分支的描绘，32通道线圈证明是优越的上级。结论：使用32通道线圈有利于胸主动脉的4D流动敏感MRI，可以减少总扫描时间，同时保持整体图像质量。
Purpose: To evaluate the performance of four-dimensional (4D) flow-sensitive MRI in the thoracic aorta using 12- and 32-channel coils and parallel imaging.Materials and Methods: 4D flow-sensitive MRI was performed in the thoracic aorta of 11 healthy volunteers at 3 Tesla (T) using different coils and parallel imaging (GRAPPA) accelerations (R): (i) 12-channel coil, R = 2; (ii) 12-channel coil, R = 3; (iii) 32-channel coil, R = 3. The quantitative analysis included SNR, residual velocity divergence and length and curvature of traces (streamlines and pathlines) as used for 3D flow visualization. In addition, semi-quantitative image grading was performed to assess quality of phase-contrast angiography and 3D flow visualization.Results: Parallel imaging with an acceleration factor R = 3 allowed to save 19.5 +/- 5% measurement time compared with R = 2 (14.2 +/- 2.4 min). Acquisition using 12 channels with R = 2 and 32 channels with R = 3 produced data with significantly (P < 0.05) higher quality compared with 12 channels and R = 3. There was no significant difference between 12 channels with R = 2 and 32 channels with R = 3 but for the depiction of supra-aortic branches where the 32-channel coil proved superior.Conclusion: Using 32-channel coils is beneficial for 4D flow-sensitive MRI of the thoracic aorta and can allow for a reduction of total scan time while maintaining overall image quality.