title: Ultrasonic calculation of chorion cavity volume.
abstract: A method for calculating chorion cavity volume in the first trimester of pregnancy from the ultrasonic projection of the gestation sac is described. The area of the longitudinal and transverse sections were measured, and the volume was calculated from the mean value of the two measurements. The chorion cavity volume increased curvilinearly and approximately exponentially from 2.14 cc at five weeks to 44.38 cc at 11 weeks of gestation. The method was checked by comparing the computed volume and the real volume obtained surgically and by experimenting with an "artificial gestation sac" picture. A good correlation was obtained. The results match data reported in the literature.
mesh_terms: D001699:Biometry / Q000379:methods; D002823:Chorion / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D014463:Ultrasonography