高场强磁共振在急性硬膜下血肿的应用并与CT对比分析

Comparative study with high field MR and CT in the diagnosis of acute subdural hematoma

目的评价高场强M RI在急性硬膜下血肿(acute subdural hem atom a ASDH)的应用价值。方法回顾性分析我院2002年6月～2005年6月253例颅脑损伤患者影像学资料,所有患者均于伤后3天内行常规CT横切位扫描及高场强磁共振成像系统扫描,分析高场强M RI对急性硬膜下血肿的显示情况并与CT扫描结果进行比较。结果M RI诊断323处ASDH阳性病灶中,常规CT扫描只显示其中63.2%(204/323);M RI和CT对总体阳性病灶比较,两者差异具有统计学意义(t=3.258 p<0.05);M RI诊断的阳性病灶中,随着血肿厚度的减少,CT对比M RI的显示率逐渐下降,在血肿<7.5m m时,CT显示范围在47.4～65.8%,血肿>7.5m m时,CT显示范围在71.4～86.0%。结论高场强M RI对ASDH显示清晰,诊断率较常规CT明显提高,血肿厚度越薄,优势越加明显。

Objective To comparative study the value by high field MR imaging and CT in the diagnosis of acute subdural hematoma. Methods The imaging datas of 253 craniocerebral trauma patients were analyzed retrospectively. Routine CT transversal scans and MR1 scans were performed in all patients within 3 days after being injured. The display rate of ASDH was compared in CT and MR imaging. Results There were 323 ASDHs（253 patients） were displayed on MR imaging, of which positive CT finding was 63.2%（204/323）;Significant different between MR imaging and CT on the display of total ASDHs by statistical analysis （t=3.258 P〈0.05）. The display ratio between CT and MRI descend gradually along with the thickness of hematoma reduce. Conclusions High field MR imaging was better than CT to diagnose the ASDHs,especially to the hematoma less than 7.5mm.