MR弥散加权成像在急性脑梗死诊断中的价值

目的:探讨MR弥散加权成像(diffusion-weighted imaging,DWI)技术在诊断急性脑梗死中的价值。方法:分析31例临床确诊为急性脑梗死患者的DWI图像,其中超急性期(小于4小时)3例,急性期(4～24小时)28例,观察和分析DWI图上异常信号的部位、强度和边界,选择并测量病变区表观弥散系数(apparent diffusion coefficient,ADC),并与同层对侧相应正常部位影像进行比较。结果:(1)所有急性脑梗死病灶在DWI均表现为高信号。31例患者共诊断1cm以上急性梗死病灶39个;(2)随着b值的增加,弥散效果越好,梗死显示也越清晰。(3)梗死部位ADC值明显低于对侧相应部位,差异有显著性(P<0.01)。结论:磁共振DWI技术对急性脑梗死病变显示敏感性和准确性高,在脑梗死早期诊断中有很高的价值。

The value of diffusion-weighted imaging with 3.0T MR in the diagnosis of acute cerebral infarction

Objective:To explore the value of DWI in the diagnosis of acute cerebral infarction. Methods:Thirty-one Patients with acute cerebral infarction(hyperacute cerebral infarction in 3 cases and acute cerebral infarction in 28 cases) were examined with 3T MRI DW sequence.The imaging was studied,the ADC value was calculated and compared with contralateral normal brain tissue. Results:(1)Thirty-nine acute cerebral infarction lesions were found in 31 patients.All ischemic lesions were demonstrated with hyperintensity on DWI.(2)The higher the b value,the better the effects of diffusion and imaging.(3)The value of ADC of the lesions decreased than that of the contralateral normal area. Conclusion:DWI is of a most sensitive and accurate method in the diagnosis of acute cerebral infarction.