FIRM序列在胎儿异常诊断中的应用价值

目的 评价快速反转恢复运动抑制序列(FIRM)在胎儿病变诊断中的价值.资料与方法 对45例21～39周异常胎儿行FIRM及快速稳态进动采集序列(FIESTA)扫描,将其诊断结果与产前超声、(引)产后所见或病理结果进行比较.结果 45例胎儿病变分别为中枢神经系统异常(CNS)4例,FIRM确定了胎儿颅内出血诊断;胸部异常6例,FIRM显示了先天性肺囊腺瘤样畸形(CCAM)、先天性膈疝(CDH)的信号特点;腹部异常25例,FIRM显示了腹部囊性病变、部分脐部异常(脐膨出、腹裂)、肠梗阻、肝囊肿、腹部占位的信号特点;泌尿系统异常6例,FIRM显示了多囊肾的信号特点;其他异常4例,FIRM显示了腹股沟斜疝及骶尾部畸胎瘤的信号特征.结论 FIRM序列作为FIESTA序列的补充,对诊断胎儿病变有重要作用.

The Application of Fast Inversion Recovery Motion Insensitive Sequence in the Diagnosis of Fetal Abnormalities

Objective To evaluate the role of fast inversion recovery motion insensitive sequence (FIRM) in the diagnosis of fetal abnormalities. Materials and methods Magnetic resonance imaging including FIRM and fast-imaging employing steady-state acquisition (FIESTA) was performed in all 45 abnormal fetuses of 21-39 weeks gestations suspected of abnormalities on prenatal US. MRI findings were analyzed correlated with prenatal US and postnatal and pathological findings. Results Central neural system abnormalities were found in four cases, thoracic abnormalities in six fetuses, abdominal abnormalities in twenty-five cases, genitourinary abnormalities in six cases, and other abnormalities in four cases. Conclusion FIRM might be useful in the diagnosis of fetal abnormalities and a complementary method to FIESTA.