Multi-Echo Acquisition of MR Angiography and Venography of the Brain at 3 Tesla
Multi-Echo Acquisition of MR Angiography and Venography of the Brain at 3 Tesla
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DOI：
10.1002/jmri.21833
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发表时间：
2009-08-01
影响因子：
4.4
通讯作者：
Tanabe, Jody
中科院分区：
文献类型：
--
作者：
Du, Yiping P.;Jin, Zhaoyang;Tanabe, Jody
目的：为了提高可视性的静脉磁共振加权成像（SWI）使用多梯度回波acquisition.Materials和方法：一个三维多回波梯度回波脉冲序列开发的同时采集的MR血管造影和多个体积的MR静脉造影（MRV）的大脑。使用飞行时间流入效应采集第一回波用于MR血管造影。结果：在不同回波时间（TE）采集的多个MRV数据集在显示静脉血管方面具有互补性。在较长TE下采集的MRV数据具有较高的静脉对比度和较强的敏感性加权，而在较短TE下采集的MRV数据具有较高的信噪比和较不严重的非共振伪影。局部场梯度的三维映射计算和横向弛豫率（R（2）*）在每个体素量化使用多TE指数fitting.Conclusion：多回波采集的MR血管造影和静脉造影表现出改善的静脉血管的可见性，特别是在区域严重的字段不均匀性相比，传统的收购。MR血管造影和静脉造影的SWI和双回波采集。
Purpose: To improve the visibility of veins in susceptibility-weighted imaging (SWI) using a multi-gradient echo acquisition.Materials and Methods: A three-dimensional multi-echo gradient-echo pulse sequence was developed for simultaneous acquisition of MR angiography and multiple volumes of MR venography (MRV) of the brain. The first echo was acquired for MR angiography using the time-of-flight inflow effect. The subsequent echoes were acquired for SWI-based MRV at different echo times (TEs).Results: Multiple MRV datasets acquired at different TEs were complementary in depicting the venous vasculature. MRV data acquired at a longer TE had a higher venous contrast and stronger susceptibility weighting, whereas MRV data acquired at a shorter TE had a higher signal-to-noise ratio and less severe off-resonance artifacts. Three-dimensional mapping of local field gradients was calculated and the transverse relaxivity (R(2)*) at each voxel was quantified using multi-TE exponential fitting.Conclusion: Multi-echo acquisition of MR angiography and venography demonstrated improved visibility of venous vasculature especially in regions with severe field inhomogeneity compared with conventional acquisition of. SWI and dual-echo acquisition of MR angiography and venography.