Comparison 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
Data
2010-03-01
Autores
Machado Nardozza, Luciano Marcondes 
Rolo, Liliam Cristine
Araujo Junior, Edward
Nowak, Paulo Martin
Bortoletti Filho, Joao
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Artigo
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Título de Volume
Resumo
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 degrees rotation were used. A total of 15 adjacent planes were used for the XI VOCAL method. Regression models with a determination coefficient (R<SU2</SU) 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<SU2</SU = 0.65 for XI VOCAL, R<SU2</SU = 0.65 for planimetric and R<SU2</SU = 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.
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Acta Obstetricia Et Gynecologica Scandinavica. Oslo: Taylor & Francis As, v. 89, n. 3, p. 328-334, 2010.