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

Authors: Machado Nardozza, Luciano Marcondes; Rolo, Liliam Cristine; Júnior, Edward Araujo; Nowak, Paulo Martin; Filho, João Bortoletti; Moron, Antonio Fernandes

Source: Acta Obstetricia et Gynecologica Scandinavica, Volume 89, Number 3, March 2010 , pp. 328-334(7)

Publisher: Informa Healthcare

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Abstract:

<title>Abstract</title>

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 (R²) 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 (R² = 0.65 for XI VOCAL, R² = 0.65 for planimetric and R² = 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.

Keywords: First trimester; gestational sac; volume measurement; three-dimensional imaging; VOCAL

Document Type: Research article

DOI: http://dx.doi.org/10.3109/00016340903508643

Affiliations: 1: Department of Obstetrics, São Paulo Federal University (UNIFESP), São Paulo, SP, Brazil

Publication date: 2010-03-01

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