目的 探讨胎儿生长受限的胎盘 MRI上的形态学及信号改变特征。方法 回 顾分析我院2015年7月-2018年2月采用核 磁共振(MRI)检查胎儿生长受限孕妇100 例，对孕妇子宫行矢、冠、轴面扫描，分 析孕妇影像资料，测量胎盘相关数值。 结果 胎儿生长受限的胎儿胎盘表现为胎 盘增厚呈球型，胎盘子宫附着面面积减 小，胎盘边缘附着处圆钝，部分伴有胎盘 梗死，表现为HASTE序列上中央高信号边 缘弥漫性信号改变；胎盘后出血，表现 为HASTE序列上胎盘下小片状低信号影； 绒毛膜下出血，表现为HASTE序列上绒毛 膜下小片状低信号影，胎盘MRI表现与孕 妇产后病理表现，差异无统计学意义(P ＞0.05)；娩后死亡患儿19例，存活组新 生儿胎盘体积高于死亡组，差异有统计 学意义(P＜0.05)；存活组胎盘最大厚度 及胎盘最大厚度与胎盘体积比值低于对照 组，差异有统计学意义(P＜0.05)；胎儿 生长受限胎盘MRI胎盘体积与生产后测量 胎盘结果对照，差异无统计学意义(P＞ 0.05)。结论 MRI检查胎儿生长受限的胎 盘具有多种特征影像学表现，可用于临床 诊断。

Objective To investigate the morphological and signal-changing characteristics of placental MRI in fetal growth restriction. Methods A total of 100 cases of fetal growth restriction in pregnant women examined by MRI from July 2015 to February 2018 in our hospital were analyzed retrospectively. The uterus of the pregnant woman was examined by sagittal, crown and axial scans. The maternal image data was analyzed, the placenta-related values were measured. Results The placental with fetal growth restriction in fetus showed a thickening a spherical shape of the placenta. The area of the placenta uterus attachment surface was reduced, the placenta of attachment at the edge became circle bluntness, some were accompanied by placental infarction, expressing as a diffuse signal change in the central high signal edge on the HASTE sequence; After placental hemorrhage, it expressed as small platelet low signal shadow under placenta in HASTE sequence; there was subchorionic hemorrhage, expressing as small platelet low signal shadow under the chorion in HASTE sequence. There was no statistical difference between the expression of placental MRI and postpartum pathological expression in pregnant women (P>0.05); 19 children died after delivery, the placental volume of the newborn in the survival group was higher than that in the death group, the difference was statistically significant (P<0.05); The maximum thickness of the placenta and the ratio of the maximum thickness of the placenta to placenta volume in the survival group were lower than those of the control group (P<0.05). There was no significant difference between the placental volume of fetal growth restriction placenta MRI and the placenta after production (P>0.05). Conclusion MRI examination of placenta with fetal growth restriction has a variety of characteristic imaging performances and can be used for clinical diagnosis.