Department of Radiology, Osaka University Postgraduate School of Medicine, Suita, Japan.
Magn Reson Med Sci. 2011;10(1):29-32. doi: 10.2463/mrms.10.29.
The distal dural ring (DDR) is an anatomical landmark used to distinguish intra- and extradural aneurysms. We investigated identification of the DDR using 2 three-dimensional (3D) magnetic resonance (MR) cisternography sequences--3D constructive interference in steady state (CISS) and 3D sampling perfection with application optimized contrasts using different flip angle evolutions (SPACE)--at 3.0 tesla.
Ten healthy adult volunteers underwent imaging with 3D-CISS, 3D-SPACE, and time-of-flight (TOF) MR angiography (TOF-MRA) sequences at 3.0T. We analyzed DDR identification and internal carotid artery (ICA) signal intensity and classified the shape of the carotid cave.
We identified the DDR using both 3D-SPACE and 3D-CISS, with no significant difference between the sequences. Visualization of the outline of the ICA in the cavernous sinus (CS) was significantly clearer with 3D-SPACE than 3D-CISS. In the CS and petrous portions, signal intensity was lower with 3D-SPACE, and the flow void was poor with 3D-CISS in some subjects.
We identified the DDR with both 3D-SPACE and 3D-CISS, but the superior contrast of the ICA in the CS using 3D-SPACE suggests the superiority of this sequence for evaluating the DDR.
硬脑膜远环(DDR)是一种解剖学标志,用于区分硬内和硬外动脉瘤。我们使用两种三维(3D)磁共振(MR)脑池造影序列——三维稳态构成干扰(3D-CISS)和三维采样完美应用优化对比使用不同翻转角演化(3D-SPACE)——在 3.0T 下研究了 DDR 的识别。
10 名健康成年志愿者在 3.0T 下进行 3D-CISS、3D-SPACE 和时飞(TOF)磁共振血管造影(TOF-MRA)序列成像。我们分析了 DDR 的识别以及颈内动脉(ICA)的信号强度,并对颈动脉窝的形状进行了分类。
我们使用 3D-SPACE 和 3D-CISS 都可以识别 DDR,两种序列之间没有显著差异。与 3D-CISS 相比,3D-SPACE 更能清晰地显示海绵窦(CS)内 ICA 的轮廓。在 CS 和岩骨部分,3D-SPACE 的信号强度较低,在一些受试者中,3D-CISS 的血流空洞较差。
我们使用 3D-SPACE 和 3D-CISS 都可以识别 DDR,但 3D-SPACE 对 CS 内 ICA 的对比度更高,表明该序列在评估 DDR 方面具有优势。