Rousian, M.

volume measurement ultrasound study fi rst trimester pregnancy obstet gynecol dataset sac volume growth al .3 ellipsoid formula john wiley difference sac diameter v-scope women grisolia steegers ea chart application method crown –rump length exalto n reality diameter formula erasmus mc volume measurements figure gsd measurements yolk sac trimester i-space sac fluid volume rst-trimester wiley koning v-scope application hop wc system embryo length rousian steeger verwoerd-dikkeboom exalto analysis structure outcome isuog copyright gestation technique ellipsoid fi ndings 78 scans signi ficantly value equation verwoerd-dikkeboom cm 6 weeks relationship netherland fi rst-trimester pregnancies vr application umbilical cord correlation parameter department erasmu 524–529. logarithmic –rump trisomy rotterdam crown repeated-measures analysis segmentation algorithm