MRI对正常胎儿标本小脑蚓部的测量

MRI measurement of fetal cerebellar vermis development

目的描述正常胎儿标本小脑蚓部在不同孕周的正常发育生长曲线。材料与方法使用3．0TMRIX对63例胎儿标本进行扫描，孕周15～40周，其中符合测量要求的为52例，扫捕序列：T1WI、T2WI；扫描层面：矢状面、冠状面、横轴面；测量：小脑蚓前后径、上蚓高度及下蚓高度。对上述测量结果和孕周之间作回归分析。结果小脑蚓前后径、上蚓高度、下蚓高度与孕周分别呈线性正相关，上蚓高度稍大于下蚓高度，原裂和下后裂在多数正中矢状面上显示清晰，P〈0．05。结论胎儿小脑蚓部于17孕周以后在MR止可显示其正常表现及发育生长规律。

Objectives： To study the growth curve of the fetal cerebellar vermis in different gestational age. Materials and Methods： Sixty-three fetuses （15- 40 gestational weeks） were scanned by 3.0 T magnetic resonance, in which 52 cases met the measurement requirements. Scanning sequence： T1WI, T2WI. Scanning plane： Sagittal, Coronal, Axial. Measurement： the antero-posterior diameter （APD）, the height of anterior and posterior vermis. The linear regression between the gestational age and parameters mentioned above was analyzed. Results： The antero-posterior diameter, the height of anterior and posterior vermis were positively correlated with gestational age. The height of anterior vermis slightly higher than posterior vermis, the primary and infero-posterior fissure could clearly displayed in the most middle sagittal plane, P〈0.05. Conclusions： The normal performance and growth curve of the fetal cerebellar vermis can be described by MR imaging after 17 weeks.