3D time-of-flight MR angiography of the intracranial vessels:: optimization of the technique with water excitation, parallel acquisition, eight-channel phased-array head coil and low-dose contrast administration
3D time-of-flight MR angiography of the intracranial vessels:: optimization of the technique with water excitation, parallel acquisition, eight-channel phased-array head coil and low-dose contrast administration
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DOI：
10.1007/s00330-004-2411-4
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发表时间：
2004-11-01
影响因子：
5.9
通讯作者：
Parizel, PM
中科院分区：
文献类型：
--
作者：
Özsarlak, Ö;Van Goethem, JW;Parizel, PM
本研究的目的有三个方面：比较八通道相控阵和标准圆极化（CP）头部线圈对颅内血管的显示，比较三维（3D）飞行时间（TOF）磁共振血管成像（MRA）技术，并确定并行成像在3D TOF MRA中的作用。15名健康志愿者使用八通道相控阵和CP标准头部线圈进行颅内血管的3D TOF MRA。对每名志愿者进行以下MRA技术：（1）常规3D TOF MRA，磁化转移;（2）3D TOF MRA，水激发用于背景抑制;（3）低剂量（0.5 ml）钆增强3D TOF MRA，水激发。结果表明，水激励是一种有价值的背景抑制技术，特别是当应用于八通道相控阵头部线圈。对于颅内动脉的中央和近端部分，水激发的非增强TOF MRA是最好的技术。使用八通道相控阵头部线圈的低剂量对比增强TOF MRA在评价远端分支方面优于标准CP头部线圈。加速因子为2的并行成像允许重要的时间增益，而不会显著降低血管评价。水激发允许更好的背景抑制，特别是在轨道周围和周边，当与传统的采集相比。
The aim of this study is three folds: to compare the eight-channel phased-array and standard circularly polarized (CP) head coils in visualiazation of the intracranial vessels, to compare the three-dimentional (3D) time-of-flight (TOF) MR angiography (MRA) techniques, and to define the effects of parallel imaging in 3D TOF MRA. Fifteen healthy volunteers underwent 3D TOF MRA of the intracranial vessels using eight-channel phased-array and CP standard head coils. The following MRA techniques were obtained on each volunteer: (1) conventional 3D TOF MRA with magnetization transfer; (2) 3D TOF MRA with water excitation for background suppression; and (3) low-dose (0.5 ml) gadolinium-enhance 3D TOF MRA with water excitation. Results are demonstrating that water excitation is a valuable background suppression technique, especially when applied with an eight-channel phased-array head coil. For central and proximal portions of the intracranial arteries, unenhanced TOF MRA with water excitation was the best technique. Low-dose contrast enhanced TOF MRA using an eight-channel phased-array head coil is superior in the evaluation of distal branches over the standard CP head coil. Parallel imaging with an accelaration factor of two allows an important time gain without a significant decrease in vessel evaluation. Water excitation allows better background suppression, especially around the orbits and at the periphery, when compared to conventional acquisitions.