MRI快速成像技术在前置胎盘诊断中的应用价值

Application Value of the Fast Magnetic Resonance Imaging Technique in the Diagnosis of Placenta Previa

目的探讨MRI快速成像技术在前置胎盘诊断中的应用价值。方法采用单激发快速自旋回波(SSFSE)序列和快速稳态进动采集(FIESTA)序列,对25例前置胎盘孕妇行MRI扫描,观察和分析前置胎盘的MRI表现。结果 25例前置胎盘中,边缘型前置胎盘1例,部分型前置胎盘6例,完全型前置胎盘18例;前置胎盘合并胎盘植入9例,其中胎盘粘连3例,胎盘植入5例,胎盘穿透1例。MRI可直观地显示前置胎盘与子宫颈内口之间的关系,合并有胎盘植入的病例,可见子宫肌层的低信号线影局部中断,相对高信号的胎盘组织由此侵入到肌层。结论 MRI快速成像技术在前置胎盘及胎盘植入的诊断中有较高的临床应用价值。

Objective To evaluate the application value of the fast magnetic resonance imaging technique in the diagnosis of placenta previa. Methods 25 patients diagnosed with placenta previa underwent the single shot fast spin echo（SSFSE） sequence and fast imaging employing steady state acquisition（FIESTA） sequence scanning. The MRI features and clinic appearances of these 25 cases were analyzed. Results One out of the 25 cases was marginal placenta previa, 6 cases were partial placenta previa, 18 cases were complete placenta previa. Nine cases were placenta previa complicated with placenta accrete： 3 out of the 9 cases were placenta adhesion, 5 of 9 were placenta increta, 1 of 9 was placenta penetration. MRI could show the relationship between the placenta and the internal cervical orifices straightly. The linear low signal intensity of the myometrium was discontinued in the cases complicated with placenta accrete, relatively high signal of the placenta intruded into the myometrium from the discontinued place. Conclusion The fast MRI technique has high clinical application value in the diagnosis of the placenta previa and placenta accrete.