title: Placental Volumetry by 2-D Sonography with a New Mathematical Formula: Prospective Study on the Shell of a Spherical Sector Model.
abstract: The aim of this study was to determine the utility of a new mathematical model in volumetric assessment of the placenta using 2-D ultrasound. Placental volumetry was performed in a prospective cross-sectional survey by virtual organ computer-aided analysis (VOCAL) with the help of a shell-off method in 346 uncomplicated pregnancies according to STROBE (Strengthening the Reporting of Observational Studies in Epidemiology) guidelines. Furthermore, placental thickness, length and height were measured with the 2-D technique to estimate placental volume based on the mathematical formula for the volume of "the shell of the spherical sector." Fetal size was also assessed by 2-D sonography. The placental volumes measured by 2-D and 3-D techniques had a correlation of 0.86. In the first trimester, the correlation was 0.82, and later during pregnancy, it was 0.86. Placental volumetry using "the circle-shaped shell of the spherical sector" mathematical model with 2-D ultrasound technique may be introduced into everyday practice to screen for placental volume deviations associated with adverse pregnancy outcome.
authors.affiliation: Reproductive Medicine, Department of Obstetrics and Gynecology, Huddinge Karolinska University Hospital, Stockholm, Sweden. Electronic address: kozinszky@gmail.com.
authors.forename: Zoltan
authors.initials: Z
authors.lastname: Kozinszky
authors.affiliation: Department of Obstetrics and Gynecology, University of Szeged, Szeged, Hungary.
authors.forename: Andrea
authors.initials: A
authors.lastname: Surányi
authors.affiliation: Faculty of Civil Engineering, University of Novi Sad, Subotica, Serbia.
authors.forename: Hajnalka
authors.initials: H
authors.lastname: Péics
authors.affiliation: Department of Obstetrics and Gynecology, University of Szeged, Szeged, Hungary.
authors.forename: András
authors.initials: A
authors.lastname: Molnár
authors.affiliation: Department of Obstetrics and Gynecology, University of Szeged, Szeged, Hungary.
authors.forename: Attila
authors.initials: A
authors.lastname: Pál
mesh_terms: D000293:Adolescent; D000328:Adult; D000465:Algorithms; D003198:Computer Simulation; D005260:Female; D020567:Fetal Weight / Q000502:physiology*; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008954:Models, Biological; D009929:Organ Size / Q000502:physiology; D010920:Placenta / Q000000981:diagnostic imaging* / Q000502:physiology*; D011247:Pregnancy; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016216:Ultrasonography, Prenatal / Q000379:methods*; D055815:Young Adult
keywords: 2-D ultrasound technique; 3-D ultrasound technique; Placenta; Virtual organ computer-aided analysis; Volumetry