Hill M C, Lande I M, Larsen J W
George Washington University Medical Center, Washington DC.
Radiol Clin North Am. 1988 Mar;26(2):287-307.
In conclusion, it is unlikely that MRI will replace ultrasound as the primary obstetric imaging modality in the near future. Ultrasound has a proven record of accuracy and safety in addition to its easy access and low cost. MRI has promise, however, in providing crucial information in patients with underlying medical or surgical conditions that would ordinarily require ionizing radiation for evaluation. Currently, MRI is helpful in evaluating gross fetal anomalies and disturbances of fetal growth and development when ultrasound is limited by oligohydramnios or maternal obesity. Further experience is required to determine the value of spectroscopy and quantitative relaxation times regarding fetal metabolism and fetal well-being. Technologic improvements and software updates will reduce imaging time and increase spatial resolution, thus rendering MRI more competitive with existing imaging techniques. The ultimate role, however, that MRI will have in the evaluation of the fetus is currently undefined.
总之，在不久的将来，磁共振成像（MRI）不太可能取代超声成为主要的产科成像方式。超声除了易于获取且成本低廉外，在准确性和安全性方面有着经证实的记录。然而，MRI有望为患有基础内科或外科疾病的患者提供关键信息，而这些患者通常需要电离辐射来进行评估。目前，当超声因羊水过少或孕妇肥胖而受到限制时，MRI有助于评估明显的胎儿异常以及胎儿生长发育的紊乱情况。需要更多经验来确定关于胎儿代谢和胎儿健康状况的光谱分析及定量弛豫时间的价值。技术改进和软件更新将减少成像时间并提高空间分辨率，从而使MRI与现有成像技术更具竞争力。然而，MRI在胎儿评估中最终所起的作用目前尚不确定。
