Open AccessComparison of gestational sac volume by 3D‐sonography using planimetric, virtual organ computer‐aided analysis and extended imaging virtual organ computer‐aided analysis methods between 7 and 11 weeks of pregnancy
Author(s) -
MACHADO NARDOZZA LUCIANO MARCONDES,
ROLO LILIAM CRISTINE,
JÚNIOR EDWARD ARAUJO,
NOWAK PAULO MARTIN,
FILHO JOÃO BORTOLETTI,
MORON ANTONIO FERNANDES
Publication year - 2010
Publication title -
acta obstetricia et gynecologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.401
H-Index - 102
eISSN - 1600-0412
pISSN - 0001-6349
DOI - 10.3109/00016340903508643
Subject(s) - medicine , intraclass correlation , ultrasound , gestational age , correlation coefficient , gestational sac , nuclear medicine , anatomy , radiology , gestation , pregnancy , mathematics , statistics , clinical psychology , genetics , biology , psychometrics
Objective . To compare different three‐dimensional (3D) methods in the assessment of gestational sac volume (GSV). Design . Cross‐sectional study involving 74 normal pregnancies between 7 and 11 weeks. Setting . Department of Obstetrics, São Paulo Federal University (UNIFESP). Methods . GSV was measured through 3D ultrasound using the planimetric, virtual organ computer‐aided analysis (VOCAL) and extended imaging virtual organ computer‐aided analysis (XI VOCAL) methods. The planimetric method used a sequence of adjacent planes that are 3 mm thick. For the VOCAL methods, six adjacent planes and a 30° rotation were used. A total of 15 adjacent planes were used for the XI VOCAL method. Regression models with a determination coefficient ( R 2 ) were created to assess the correlation between GSV and gestational age (GA). Intraclass correlation coefficient (ICC) and Bland‐Altman graphs were used to assess the correlation between the three methods and ANOVA was used to compare means. Results . All three methods showed a correlation between GSV and GA ( R 2 = 0.65 for XI VOCAL, R 2 = 0.65 for planimetric and R 2 = 0.66 for VOCAL). There was a strong correlation between the three methods (XI VOCAL vs. planimetric ICC = 0.995; XI VOCAL vs. VOCAL ICC = 0.998 and planimetric vs. VOCAL ICC = 0.995) without any significant differences according to the Bland‐Altman graphs or ANOVA ( p < 0.002). Conclusions . The three 3D ultrasound methods used for GSV assessment between 7 and 11 weeks are concordant. These methods can be used interchangeably during the first trimester of pregnancy to measure GSV.