We use midsagittal T2WI-based structural MRI images to investigate the relationship between fetal brainstem growth and corresponding gestational weeks. The changes of fetal brainstem substructure in of 153 pregnant women in the middle and late stages were quantitatively evaluated. We found that all measurement indices (height, anteroposterior diameter and cross-sectional area) of normal fetal brainstem were significantly correlated with gestational age. Our study demonstrates that MRI can clearly show the fetal brainstem structure, and the changes of brainstem substructure follow certain rules in fetus.
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