摘要
目的:探讨磁共振弥散加权成像（diffusion weight imaging,DWI）和表面弥散系数图（apparent diffusion coefficient map-ping,ADCmap）对各期脑梗死的诊断作用。方法:应用磁共振T1加权（MRI T1 W）、T2加权（T2W）和水抑制反转恢复成像（fluid-attenuated inversion recovery,FLAIR）和DWI对70例各期脑梗死病人进行86人次MRI检查,并作ADC图,测定病灶ADC平均值及病灶中心至边缘的值。结果:在超急性脑梗死病例中,DWI和ADC图均表现缺血,病灶中心至边缘的ADC值呈梯度增高,但T2及FLAIR成像均正常,病灶的ADC值随梗死时间延长,呈由低向高变化趋势。结论:对急性脑缺血病变,DWI比T2W和FLAIR更敏感,ADC图可量化缺血程度,二者结合应用对脑梗死的早期诊断和病灶的转归评估有重要意义。
Objective:To study the roles of MRI DWI and ADC map in diagnosing various stages of cerebral infarction. Methods:86 work-ups of 70 patients in various stages of cerebral infarction were imaged with MRI T1 W,T2W,FALIR and DWI. The average ADC values of infarction lesions were calculated on ADC map. Results: Hyperacute cerebral ischemic regions were manifested on DWI and ADC map, but not on TWI and FLAIR . ADC values of infarction increased progressively with the prolongation of time. Conclusions:DWI has greater sensitivity for acute cerebral infarction than T2 WI and FLAIR. The ischemic stage could be determined on ADC map can and cerebral infarction could be diagnosed early and its prognosis could be evaluated by combination with T2 WI and FLAIR.
出处
《诊断学理论与实践》
2002年第1期25-27,共3页
Journal of Diagnostics Concepts & Practice
基金
广东省医学科研课题资助(A2000339)
