磁共振扩散加权成像在短暂性脑缺血发作的诊断价值

Diagnostic Value of Diffusion Weighted Magnetic Resonance Imaging in Transient Ischemic Attacks

目的探讨磁共振扩散加权成像(DWI)在短暂性脑缺血发作(TIA)患者相关责任病灶的检出率及其较常规MRI检查的优势。方法前瞻性对连续的41例资料完整的TIA患者行常规MRI和DWI检查,分别记录各序列的检出率,并对不同序列检出率进行χ2检验。所有患者MRI检查均在TIA发作5天内进行。结果TIA患者的DWI表现为点状的异常高信号。DWI、FLAIR和T2WI各序列对TIA责任病灶的检出率分别为36.6%(15/41)、19.5%(8/41)和12.2%(5/41)。各序列比较差异有显著性意义(χ2=7.31,P<0.05)。DWI共发现15例患者中的18个TIA责任病灶影,病灶多在基底节区,占50%(9/18)。结论DWI序列对TIA责任病灶的检出率明显高于常规MRI,DWI序列在区分急性和慢性病灶方面有很大价值,对临床诊治和疗效评价很有帮助。

Objective：To explore the incidence of diffusion weighted imaging （DWI） abnormalities in patients with transient＇ ischemic attack （TIA） ,and the advantage of DWI over conventional MR imaging. Methods： A prospective analysis Was performed on 41 patients who underwent DWI.FLAIR and T2WI sequence scan less than 5 days after symptom onset. The detection rate of responsible focus was compared with others by using Pearson χ^2 test, Results： The related focus of TIA were most located.at basal ganglia 50 % （9/18）. The incidence of Dositive on DWI. FLAIR,T2 WI scans was 36.6 % （15/41 ）. 19.5% （8/41 ）, 12.2 % （5/41 ） respectively. The detection rate of responsible focus on DWI was significant to conventional MR imaging. Conclusion;The incidence of positive DWI scans is greater than that of conventional MR imaging. DWI is also helpful in distinguishing the difference between chronic and acute lesions. These signs are of great clinical utility.