Anzalone N, Triulzi F, Scotti G
Department of Neuroradiology, Scientific Institute H.S. Raffaele, Milan, Italy.
Neuroradiology. 1995 May;37(4):257-61. doi: 10.1007/BF00588327.
To evaluate the efficacy and reliability of 3D time-of-flight MR angiography (TOF MRA) as a noninvasive procedure, 27 patients with acute subarachnoid haemorrhage (SAH) were studied with MRA immediately before or after intra-arterial digital subtraction angiography (DSA).3DTOF MRA was performed with an axial slab of 60 mm centered on the circle of Willis and isotropic voxels. DSA showed 22 aneurysms and 1 dural arteriovenous fistula in 21 patients; the aneurysms ranged in size from 2 to 8mm. MRA failed to show 2 small aneurysms, at the origin of the posterior and anterior communicating arteries. The 3D display of the intracranial vessels obtained with maximum intensity projection (MIP) or targetted MIP sometimes rendered the aneurysms better than DSA. However, due to its high spatial resolution, DSA more clearly defined the overall anatomy of the walls of the normal and abnormal vessels.
为评估三维时间飞跃磁共振血管造影（TOF MRA）作为一种非侵入性检查方法的有效性和可靠性，对27例急性蛛网膜下腔出血（SAH）患者在行动脉数字减影血管造影（DSA）之前或之后立即进行了MRA检查。3D TOF MRA以Willis环为中心进行60mm轴位层面扫描，采用各向同性体素。DSA显示21例患者中有22个动脉瘤和1个硬脑膜动静脉瘘；动脉瘤大小为2至8mm。MRA未能显示后交通动脉和前交通动脉起始处的2个小动脉瘤。通过最大密度投影（MIP）或靶向MIP获得的颅内血管三维显示有时比DSA能更好地显示动脉瘤。然而，由于DSA具有较高的空间分辨率，它能更清晰地显示正常和异常血管壁的整体解剖结构。
