目的：探讨3.0T磁共振的磁敏感加权成像（SWI）和磁共振脑血管造影（MRA）对小脑急性缺血性卒中的血栓形成、责任血管关系及临床应用价值。方法：30例急性小脑缺血性卒中（<72 h）行常规头颅MRI、MRA、SWI检查，比较SWI显示小脑急性缺血性卒中的责任血管有无血管磁敏感征（SVS）检出数及MRA显示动脉狭窄后闭塞数及相关性。结果：30例急性缺血性卒中在DWI显示小脑动脉供血区呈高信号，ADC图呈低信号，其中小脑后下动脉供血区为21例，占70%，小脑前下动脉7例，占23.3%，小脑上动脉2例，占6.7%。14例患者在MRA显示小脑动脉狭窄或闭塞，占46.7%，16例未能显示狭窄或闭塞供血动脉，占53.3%。在SWI上梗死责任动脉内低信号的SVS有26例，占86.7%，其中双SVS征7例，未见显示4例，占13.3%。SWI和MRA显示小脑动脉SVS及责任血管检查数显示有显著差异（?字2=10.800，P=0.002）。结论：SWI和MRA对小脑急性缺血性卒中的责任血管均可显示，但SWI对小动脉血栓检出率明显优于3D-TOF-MRA。

Objective: To investigate the effects of 3.0T magnetic resonance susceptibility weighted imaging(SWI) and MRA in thrombosis and according vascular responsibility in acute cerebellar ischemic stroke and the clinical application value. Methods: Thirty cases of acute ischemic stroke in cerebellum(<72 h) were enrolled with conventional brain MRI, MRA and SWI. Susceptibility vessel sign(SVS) on SWI and arterial stenosis or occlusion were analysed and correlated. Results: Hyperintensity on DWI and hypointensity on ADC maps were shown in all 30 cases of acute cerebellar ischemic stroke. Among all, 70%(21 cases) were from inferior posterior cerebellar artery, 23.3%(7 cases) were from anterior posterior cerebellar artery, and 6.7%(2 cases) were from anterior cerebellar artery. MRA showed cerebellar arterial stenosis or occlusion in 14 cases(46.7%), but failed in the rest 16 cases(53.3%). SVS were shown in 26 cases(86.7%) with double SVS in 7 cases, while the 4 cases had no SVS(13.3%). SWI and MRA showed significant difference in displaying SVS in cerebellar arteries and responsible vessels(χ2=10.800, P=0.002). Conclusion: SWI and MRA showed obvious consistency in displaying responsible vessels in acute cerebellar ischemic stroke. SWI was much better than 3D-TOF-MRA in detecting small arterial thrombosis.