Magnetic resonance flow measurements in real time: Comparison with a standard gradient-echo technique
Magnetic resonance flow measurements in real time: Comparison with a standard gradient-echo technique
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DOI：
10.1002/jmri.1187
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发表时间：
2001-09-01
影响因子：
4.4
通讯作者：
Nagel, E
中科院分区：
文献类型：
--
作者：
Klein, C;Schalla, S;Nagel, E
超快梯度系统和混合成像序列提供了实时获取真实的相衬流数据的机会。在1.5特斯拉磁共振（MR）断层扫描仪中，使用实时（分段k空间涡轮梯度回波平面成像序列）与梯度回波技术相比，对36条大血管（主动脉）和33条中等血管（颈动脉和髂动脉）的峰值速度和容积流量进行了评估。使用实时技术，矩阵从116减少到64，时间分辨率从30毫秒改变到124毫秒。大血管（r = 0.88）和中等血管（r = 0.81）的峰值流速测量值相关。容积流量测量相关性在大血管（r = 0.87），然而，一个穷人的相关性（r = 0.64）被发现在中型血管。因此，扫描时间可以显著减少，并且在没有心电图（ECG）触发的情况下获取图像。流量只能在大血管中以足够的精度确定，主要是由于较小血管中的空间分辨率降低，J. Magn. Reson。成像2001;14：306-310. (C)2001 Wiley-Liss，Inc.
Ultrafast gradient systems and hybrid imaging sequences offer the opportunity to acquire phase contrast flow data in real time. In a 1.5-Tesla magnetic resonance (MR)-tomograph, peak velocity and volume flow were assessed in 36 large vessels (aorta) and 33 medium-sized vessels (carotid and iliac artery) using a real-time (segmented k-space turbo gradient-echo planar imaging sequence) in comparison with a gradient-echo technique. With the real-time technique, the matrix was reduced from 116 to 64, and temporal resolution changed from 30 msec to 124 msec. Measurements of peak velocity correlated in large (r = 0.88) and medium-sized vessels (r = 0.81). Volume flow measurements correlated in large vessels (r = 0.87), however, a poor correlation (r = 0.64) was found in medium-sized vessels. Thus, scan time can be significantly reduced and images acquired without electrocardiogram (ECG)triggering. Flow volume can only be determined in large vessels with sufficient accuracy, mainly due to reduced spatial resolution in smaller vessels, J. Magn. Reson. Imaging 2001;14:306-310. (C) 2001 Wiley-Liss, Inc.