摘要
目的探讨磁共振成像(MRI)不同成像序列在产前胎儿诊断中的图像质量,为胎儿临床MRI诊断提供参考。方法选取我院B超检查提示胎儿异常并行MRI检查的42例中晚期妊娠孕妇,分别采用单次激发快速自旋回波序列(SSFSE)、快速成像稳态采集序列(FIESTA)观察胎儿的脏器解剖结构并诊断,以产后随访、引产尸检结果为诊断金标准,比较两种成像序列的诊断效果、特异性吸收率(SAR)及图像质量。结果 SSFSE、FIESTA序列正确诊断率分别为83.33%、90.48%,两者无统计学差异(P>0.05);FIESTA序列扫描SAR值为(2.79±0.08)w/kg较SSFSE序列为(2.60±0.21)w/kg高,且数值变化较为稳定,二者差异有统计学意义(P<0.05);FIESTA序列图像质量评分为(1.57±0.14)分显著高于SSFSE序列评分的(1.43±0.35)分(P<0.05);SSFSE序列图像呼吸伪影较为明显,且对液体的显示效果差于FIESTA序列。结论 SSFSE、FIESTA序列均是有效观察胎儿解剖结构、异常病变的MRI检查手段,但FIESTA序列在成像质量方面优于SSFSE序列,在诊断胎儿病变方面效果更为理想。
Objective To explore the imaging quality of different magnetic resonance imaging（MRI） sequences in prenatal diagnosis in order to provide reference for clinical MRI diagnosis of fetus. Methods A total of 42 women in mid-to-late pregnancy on whom ultrasound examination had showed abnormality in fetus received MRI examination by use of single shot fast spin echo（SSFSE）sequences and fast imaging employing steady-state acquisition（FIESTA） sequences to observe the fetal organ anatomical structure for diagnosis, with surgical follow-up and induction and autopsy results as the gold standard for diagnosis; and then, the diagnosis results,specific absorption rate（SAR） and image quality were compared. Results The correct diagnosis rate of SSFSE and FIESTA sequences were 83.33% and 90.48%, respectively, with no significant difference（P 0.05）; the SAR value for FIESTA sequences（2.79 ± 0.08）w/kg was higher than that for SSFSE sequences（2.60 ± 0.21）w/kg, with significant difference（P 0.05） but the value changes were relatively stable; the image quality score for FIESTA sequences（1.57 ± 0.14） was significantly higher than that for SSFSE score（1.43 ± 0.35）（P 0.05）; the image respiratory artifacts for SSFSE sequences is more obvious, and the display effects for liquid were worse than that for FIESTA sequences. Conclusion SSFSE and FIESTA sequences are effective means of MRI examination to observe the fetal anatomy and abnormal lesions, but the imaging quality of FIESTA sequences is better than that of the SSFSE sequences, so FIESTA sequences are more ideal in the diagnosis on fetal disease.
出处
《西南国防医药》
CAS
2017年第1期62-66,共5页
Medical Journal of National Defending Forces in Southwest China
