Glastonbury Christine M, Kennedy Anne M
Department of Radiology, University Hospital, Salt Lake City, Utah, USA.
Australas Radiol. 2002 Mar;46(1):22-32. doi: 10.1046/j.1440-1673.2001.00990.x.
During the last decade there has been increasing interest in MRI for the evaluation of ultrasound-detected fetal abnormalities. Motion artefacts previously precluded detailed imaging, but this is now possible using single-shot rapid acquisition sequences. These ultrafast techniques with subsecond images capture 'snap-shot' views of the fetus. By virtue of the infinitely long relaxation time (TR) these images are heavily T2-weighted so that fluid around and within the fetus delineates the anatomy. Currently, fetal MRI has shown to be most beneficial in the investigation of cerebral abnormalities suspected from sonography, and in the detection of subtle associated anomalies. It clearly has a role in the evaluation of complex somatic abnormalities, and is helpful in the evaluation of fetuses prior to surgery. We present a pictorial review of our experience with single-shot fast spin-echo (SSFSE) imaging, demonstrating normal anatomy of the fetal brain and body. In addition we present cerebral and somatic abnormalities to illustrate cases where we have found fetal MRI to be a useful adjunct to sonography.
在过去十年中，磁共振成像（MRI）用于评估超声检测到的胎儿异常受到越来越多的关注。先前，运动伪影妨碍了详细成像，但现在使用单次快速采集序列已成为可能。这些具有亚秒级图像的超快技术可捕捉胎儿的“快照”视图。由于具有无限长的弛豫时间（TR），这些图像具有很强的T2加权，因此胎儿周围和内部的液体勾勒出了解剖结构。目前，胎儿MRI已被证明在超声检查怀疑的脑异常调查以及细微相关异常的检测中最为有益。它在复杂躯体异常的评估中显然有作用，并且有助于术前胎儿评估。我们展示了我们使用单次快速自旋回波（SSFSE）成像的经验的图片回顾，展示了胎儿脑和身体的正常解剖结构。此外，我们展示了脑和躯体异常情况，以说明我们发现胎儿MRI是超声检查有用辅助手段的病例。
