title: Circumference measurements in obstetrical ultrasound: ellipse vs. arithmetic mean.
authors.affiliation: Department of Radiology, University of Michigan Hospitals, Ann Arbor.
authors.forename: R S
authors.initials: RS
authors.lastname: Adler
authors.forename: R A
authors.initials: RA
authors.lastname: Bowerman
authors.forename: J M
authors.initials: JM
authors.lastname: Rubin
mesh_terms: D005314:Embryonic and Fetal Development; D005333:Fetus / Q000033:anatomy & histology*; D006801:Humans; D008433:Mathematics; D014463:Ultrasonography / Q000379:methods*