摘要
目的探讨磁敏感加权成像(SWI)技术对脑血管畸形的诊断价值。方法对21例脑血管畸形行3.0T常规MRI和SWI检查,其中5例同时行时间飞跃法(TOF)磁共振血管成像(MRA)检查,1例CE-MRA检查,7例行静脉注射钆喷酸葡胺注射液(Gd-DTPA)常规增强扫描。SWI采用新的3D静态梯度回调采集(GRASS)序列覆盖全脑扫描,图像后处理采用美国通用电气公司4.2工作站及最小强度投影技术获得完整的静脉血管形态。结果在21例脑血管畸形中,包括动静脉畸形(AVM)4例,静脉畸形8例、海绵状血管瘤9例均在SWI清楚显示,其中4例AVM常规MRI和MRA与SWI情况基本一致;8例静脉畸形在常规MRI和MRA检查均未见显示,但5例增强扫描的图像有3例显示异常静脉畸形血管,与SWI所见一致;9例海绵状血管瘤常规MRI显示7例,且SWI所显示的瘤体轮廓比常规图像更加清楚。结论SWI在脑血管畸形的诊断中扮演重要的作用,特别是对小AVM、静脉畸形和海绵状血管瘤的早期检出和由此引起的出血或微出血评价有重要的价值。
Objective To assess the diagnostic value of susceptibility-weighted imaging （SWI） for cerebrovascular malformations. Methods A total of 21 cases with cerebrovascular malformations were performed on by routine 3.0T magnetic resonance imaging （MRI） and SWI, among which 5 also underwent time of flight MR angiography （TOF-MRA）, 1 contrast-enhanced MRA （CE-MRA） and 7 routine gadopentetate dimeglumine （Gd-DTPA）-enhanced MR scan. SWI, a new high-resolution three-dimensional （3D） imaging technique, used gradient-recalled acquisition in the steady state （GRASS） sequence to cover the whole brain; primitive data were transferred to the Advantage Workstation 4.2 （AW4.2, GE Medical Systems） and processed; minimum intensity projection （Min-IP） images were generated to demonstrate the complete morphology of veins. Results Among the 21 cases with cerebrovascular malformations, arteriovenous malformations （AVM, n=4）, venous malformations （n=8） and cavernous hemangiomas （n=9） were all showed clearly on SWI images. Routine MRI and MRA of the 4 cases with AVM were in accordance with SWI; the 8 cases of venous malformations were not shown by routine MRI and MRA, but abnormal malformed veins were shown on images of 3 among the 5 cases undergoing contrast-enhanced MR scan, also in accordance with what SWI observed; 7 among 9 cases of cavernous hemangiomas shown by SWI were discovered by routine MRI, but SWI demonstrated clearer profiles of tumors than routine MRI did. Conclusion SWI plays an important role in diagnosing cerebrovascular malformations, especially in early detection of small AVM, venous malformations and cavernous hemangiomas and the resulting bleeding or cerebral microbleed when other diagnostic approaches are useless.
出处
《中华神经医学杂志》
CAS
CSCD
2007年第10期1037-1040,共4页
Chinese Journal of Neuromedicine
