[ 4 ] International Society of Ultrasound in Obstetrics & Gynecology Education Committee. Sonographic examination of the fetal central nervous system: guidelines for performing the basic examination and the fetal neurosonogram[J]. Ultrasound Obstet Gynecol, 2007, 29(1): 109-116.
[ 7 ] Robinson AJ, Blaser S, Toi A, et al. The fetal cerebellar vermis: assessment for abnormal development by ultrasonography and magnetic resonance imaging[J]. Ultrasound Q, 2007, 23(3): 211-223.
[7]
[ 8 ] Sonigo PC, Rypens FF, Carteret M, et al. MR imaging of fetal cerebral anomalies[J]. Pediatr Radiol, 1998, 28(4): 212-222.