常规MRI及MRA结合磁敏感加权成像技术在脑血管畸形诊断中的应用

Application of 3.0T susceptibility-weighted magnetic resonance imaging in diagnosing cerebrovascular malformations

目的探讨MRI磁敏感加权成像（SWI）技术在诊断脑血管畸形中的价值，并比较其与常规MRI及MRA技术检出率的差异。方法选择自2008年5月至2010年12月珠江医院收治的46例脑血管畸形患者进行T1Ⅵ仃、T2WI、3DTOF、SWI及增强扫描，将SWI结果与常规MRI结果进行比较。结果46例患者中动静脉畸形25例，海绵状血管瘤10例，脑静脉畸形8例．毛细血管扩张症3例。SWI均能显示全部畸形病变，包括较小的畸形病灶，但不能全部显示动静脉畸形的供血动脉，较大的脑动静脉畸形以3DTOF法显示最好。结论SWI技术对显示小的脑血管畸形有明显优势，可清晰、准确地显示脑血管病变，结合其他MR序列有助于明确各种类型脑血管畸形的诊断。

Objective To evaluate the value of 3.0T susceptibility-weighted magnetic resonance imaging （SWI） in the diagnosis of cerebrovascular malformations. Methods Forty-six patients with cerebrovascular malformations, admitted to our hospital from May 2008 to December 2010, were examined with a 3.0T MR scanner. All patients were examined with MRI conventional sequences T1WI, T2WI, 3DTOF, and their results were compared with SWI sequence so as to evaluate the value of SWI in the diagnosis of cerebrovascular malformations. Results Twenty-five patients had arteriovenous malformation （AVM）, 10 with cavernous hemangioma, 8 with venous malformations, and 3 with telangiectasis in the 46 patients with cerebrovascular malformations. SWI could delineate all the cerebrovascular malformation lesions, especially small lesions, but could not display all supplying artery in AVM. 3DTOF was a better technique in delineating large AVM lesions. Conclusion SWI is much more sensitive in showing small cerebrovascular malformations; and combined with other MR sequences, clear diagnosis of cerebral vascular malformations can be made by SWI.