Ogawa T, Okudera T, Noguchi K, Sasaki N, Inugami A, Uemura K, Yasui N
Department of Radiology and Nuclear Medicine, Research Institute of Brain and Blood Vessels--Akita, Japan.
AJNR Am J Neuroradiol. 1996 Mar;17(3):447-54.
To evaluate the usefulness of three-dimensional CT angiography (CTA), in which contrast material is used to create reformations of dynamic scans, in the diagnosis and the preoperative evaluation of cerebral aneurysms.
We used 3-D CTA to examine 65 patients with suspected or angiographically verified cerebral aneurysms. A blind study was performed to evaluate the diagnostic accuracy of 3-D CTA for cerebral aneurysms with the use of conventional angiography as the reference standard.
In 50 patients, conventional angiography revealed 73 cerebral aneurysms ranging from 2 to 32 mm in maximum diameter. Three of the 73 cerebral aneurysms were located outside the imaging volume of 3-D CTA. The sensitivities of the two neuroradiologists for the remaining 70 aneurysms were 67% and 70%, respectively. Although 3-D CTA depicted cerebral aneurysms 5 mm or larger with good accuracy, it was less useful for the detection of smaller aneurysms. For the evaluation of giant aneurysms, this technique elucidated the relationships among the aneurysm, surrounding arteries, and neighboring bone structure.
Three-dimensional CTA is useful for the diagnosis of cerebral aneurysms with diameters of 5 mm or more. This technique is especially useful in the preoperative evaluation of giant aneurysms.
评估三维CT血管造影（CTA）在脑动脉瘤诊断及术前评估中的作用，该技术使用对比剂对动态扫描进行重组。
我们使用三维CTA检查了65例疑似或经血管造影证实患有脑动脉瘤的患者。以传统血管造影作为参考标准，进行了一项盲法研究以评估三维CTA对脑动脉瘤的诊断准确性。
在50例患者中，传统血管造影显示有73个脑动脉瘤，最大直径为2至32毫米。73个脑动脉瘤中有3个位于三维CTA的成像范围之外。两位神经放射科医生对其余70个动脉瘤的敏感度分别为67%和70%。尽管三维CTA对5毫米或更大的脑动脉瘤显示准确，但对较小动脉瘤的检测效果较差。对于巨大动脉瘤的评估，该技术阐明了动脉瘤、周围动脉和邻近骨结构之间的关系。
三维CTA对直径5毫米及以上的脑动脉瘤诊断有用。该技术在巨大动脉瘤的术前评估中尤其有用。
