INTRODUCTION:The new 3 Tesla (T) magnetic resonance (MR) scanners yield improved signal-to-noise ratio and spatial resolution with superior background suppression compared to lower field strength systems. This is advantageous for MR angiograms. The purpose of our study was to compare unenhanced three-dimensional time-of-flight magnetic resonance angiography (3D TOF MRA) at 3T with catheter digital subtraction angiography (DSA) in detecting unruptured intracranial aneurysms. MATERIALS AND METHODS:Out of 1375 consecutive patients who underwent unenhanced 3D TOF MRA at 3T, 15 patients with unruptured intracranial aneurysms were retrospectively identified. Nine of these 15 patients had DSA as the reference standard for comparison. Aneurysm size, location and morphology were independently assessed on both MRA and DSA by 2 radiologists. RESULTS:Seventeen aneurysms ranging in size from 1 mm to 24 mm were identified in 15 patients on MRA. DSA confirmed the aneurysms in 9 patients with good anatomical correlation compared with the MRA findings. CONCLUSIONS:3D TOF MRA at 3T has good correlation with DSA and aneurysms as small as 1 mm in size can be detected. This can be a promising, non-invasive method for aneurysm surveillance.

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简介:与较低的场强系统相比,新型3 Tesla(T)磁共振(MR)扫描仪可提高信噪比和空间分辨率,并具有出色的背景抑制能力。这对于MR血管造影是有利的。我们的研究的目的是比较3T时未增强的三维飞行时间磁共振血管造影(3D TOF MRA)与导管数字减影血管造影(DSA)在检测颅内动脉瘤未破裂中的作用。
材料与方法:回顾性分析了1375例连续3T行3D TOF MRA的患者,其中15例颅内动脉瘤未破裂。这15例患者中有9例以DSA作为参考标准进行比较。两名放射科医生分别在MRA和DSA上独立评估了动脉瘤的大小,位置和形态。
结果:在15例MRA患者中发现了17个大小在1mm至24mm之间的动脉瘤。 DSA证实9例患者的动脉瘤与MRA结果相比具有良好的解剖学相关性。
结论:3T时的3D TOF MRA与DSA具有良好的相关性,并且可以检测到小至1 mm的动脉瘤。这可能是一种有前途的,无创的动脉瘤监测方法。

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