论文部分内容阅读
目的 通过轴位磁共振成像(MRI)对脑桥梗死患者的椎动脉和基底动脉横截面进行分析,探讨脑后循环血流动力学变化对脑桥梗死患者的预后影响。方法 对33例脑桥梗死患者的椎动脉、基底动脉的轴位MR影像进行放大,测量其T_2像圆形黑影直径,并以此作为动脉内径值。T_1像圆形黑影直径为动脉轴流(快血流)横截面直径,将T_1、T_2像圆形黑影不显率及某些同形等(高)信号环的发生率作为慢血流的标志,然后分别进行分析比较。另以76例非脑血管疾病患者作为对照组。结果 T_2加权像显示,脑桥梗死组左、右椎动脉及基底动脉平均内径分别为(2.75±0.93)mm、(2.58±1.06)mm及(2.95±0.59)mm,小于对照组的(3.58±0.97)mm、(3.01±0.98)mm及(3.55±0.83)mm,两组比较差异有显著性意义(P<005或P<001)。T_1加权像显示,脑桥梗死组各轴流直径为(1.96±0.84)mm、(1.80±0.89)mm及(2.04±O.8)mm,与对照组比较[(2.84±0.94)mm、(2.65±0.81)mm及(3.10±0.89)mm]差异亦有显著性意义(均P<0.01)。脑桥梗死组和对照组T_1像圆形黑影边周等(高)信号环发生率均大于T_2像。结论 脑桥梗死患者具有椎动脉、基底动脉狭窄及血液轴流减少的倾向。
Objective To analyze the cross-sections of vertebral artery and basilar artery in patients with pontine infarction by axial magnetic resonance imaging (MRI) to explore the prognostic impact of posterior circulation hemodynamic changes on the outcome of patients with pontine infarction. Methods Axial MR imaging of the vertebral artery and basilar artery in 33 patients with pontine infarction was amplified. The diameter of T_2 circular shadow was measured and used as the value of arterial internal diameter. T_1 as the diameter of a circular shadow of arterial axial velocity (fast blood flow) cross-sectional diameter, the T_1, T_2 like circular shadow ineffective and some isomorphic (high) signal ring rate as a slow blood flow Logo, and then were analyzed and compared. Another 76 non-cerebrovascular disease patients as a control group. Results The T2 weighted images showed that the mean diameters of left and right vertebral artery and basilar artery in infarction group were (2.75 ± 0.93) mm, (2.58 ± 1.06) mm and (2.95 ± 0.59) mm, respectively, which were less than those in control group (3.58 ± 0.97 ) mm, (3.01 ± 0.98) mm and (3.55 ± 0.83) mm, respectively. There was significant difference between the two groups (P <005 or P <001). T_1weighted images showed that the axial diameters of the infarction group were (1.96 ± 0.84) mm, (1.80 ± 0.89) mm and (2.04 ± 0.8) mm, respectively, compared with those in the control group [(2.84 ± 0.94) mm, ± 0.81) mm and (3.10 ± 0.89) mm], respectively (all P <0.01). The incidence of equal (high) signal rings around the T_1 phantom was higher in the pontine infarction group and the control group than in the T_2 image. Conclusions Patients with pontine infarction have a tendency to decrease in vertebral artery, stenosis of basilar artery and blood flow.