3[1]Pretorius DH,Nelson TR.Fetal face visualization using three-di-mensional ultrasonography[J].J Ultrasound Med,1995,14(5):349-356.
4[1]Babinszki A, Nyari T, Jordan S, et al. Three - dimensional measurement of gestational and yolk sac volumes as predictors of pregnancy outcome in the first trimester. AmJ Perinatol, 2001, 18: 203-211.
5[2]Muller T, Sutterlin M, Pohls U, et al. Transvaginal volumetry of first trimester gestational sac: a comparison of conventional with three - dimensional ultrasound. J Perinat Med, 2000, 28: 214-220.
6[3]Dolores H, Pretorius N, Nira Borok, et al. Three dimensional ultrasound in obstetrics and gynecology. Radiologic Clinics of North America, 2001,39:499 - 521.
7[4]Benoit B, Hafner T, Kurjak A, et al. Three - dimensional sonoembryology. J Perinat Med, . 2002, 30:63 - 73.
8[5]Metzenbauer M, Hafner E, Hoefinger D, et al. Three - dimensional ultrasound measurement of the placental volume in early pregnancy: method and correlation with biochemical placenta parameters. Placenta. 2001,22: 602-605.
9[6]Metzenbauer M, Hafner E, Schuchter K, et al. First - trimester placental volume as a marker for chromosomal anomalies: preliminary results from an unselected population. Ultrasound Obstet Gynecol, 2002, 19: 240-242.
10[7]Schuchter K, Metzenbauer M, Hafner E, et al. Uterine artery Doppler and placental volume in the first trimester in the prediction of pregnancy complications. Ultrasound Obstet Gynecol, 2001, 18: 590-592.