磁共振电影相位对比法监测脑外伤后脑血流动力学改变的研究

目的 探讨磁共振电影相位对比法在诊断与监测脑外伤后血流动力学改变中的价值. 方法 选取解放军第一七五医院放射科自2010年9月至2010年12月行磁共振二维电影相位对比法成像(MRI 2D-PC Cine)监测的颅脑外伤患者40例,同期40例健康志愿者作为对照组,分析比较外伤组与对照组之间双侧颈内静脉、颈内动脉、椎动脉出颅段平均流速、峰值流速及平均流量速的差异. 结果 外伤组患者双侧颈内静脉平均流速均高于对照组,差异有统计学意义(P＜0.05),而2组间峰值流速、平均流量比较差异均无统计学意义(P＞0.05)；2组之间双侧颈内动脉、椎动脉平均流速、峰值流速及平均流量比较差异均无统计学意义(P＞0.05). 结论 MRI 2D-PC Cine法能早期定量分析颅脑外伤患者颅脑血流动力学改变,为临床治疗提供依据.

Changes of cranial hemodynamic after trauma by phase-contrast cine MR imaging

Objective To evaluate the application of phase-contrast (PC) cine MR imaging in monitoring the changes of cranial hemodynamics after trauma.Methods The 2D PC cine MR imaging was performed on 40 patients with cerebral trauma,admitted to our hospital from September 2010 to December 2010 and considered to have changes of cranial hcmodynamics,and 40 healthy volunteers; and the mean flow velocity,peak systolic velocity and time-averaged mean velocity of cranial segment in the jugular vein,carotid artery and vertebral artery were compared.Results The bilateral mean flow velocity in the jugular vein of patient group was significantly higher than that in the healthy volunteers (P＜0.05); and no significant differences were noted in the peak systolic velocity and time-averaged mean velocity of eranial segment in the jugular vein between the 2 groups (P＞0.05).And no obvious differences in the mean flow velocity,peak systolic velocity and time-averaged mean velocity of cranial segment in the carotid artery and vertebral artery were noted between the 2 groups (P＞0.05).Conclusion The 2D PC cine MR imaging can quantitatively monitor the changes of cranial hemodynamic after trauma in prophase,providing evidence for clinical treatment.