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Measuring fetal volume during late first trimester by three-dimensional ultrasonography using virtual organ computer-aided analysis.
Barra, Daniela A; Lima, Jailson C; Mauad Filho, Francisco; Araujo Júnior, Edward; Martins, Wellington P.
Afiliação
  • Barra DA; Department of Obstetrics and Gynecology, Medical School of Ribeirao Preto, University of Sao Paulo (DGO-FMRP-USP), Ribeirao Preto, Brazil.
Ultrasound Med Biol ; 39(9): 1552-9, 2013 Sep.
Article em En | MEDLINE | ID: mdl-23791355
Our aim was to determine whether rotating the fetus over its largest axis and reducing the rotational step angle can improve reliability/agreement of fetal volume measurements obtained with three-dimensional ultrasonography (3-DUS). Two observers acquired three 3-DUS data sets for a fetus with a crown-rump length between 45 and 84 mm. These observers determined the fetal volume using virtual organ computer-aided analysis (VOCAL), by three different methods, with a rotational step angle of 30°: (1) minimal manipulation of the 3-DUS data set, fetus rotated over any axis; (2) manipulation of the 3-DUS data set until the fetus could be seen in a standardized manner, fetus rotated over its anteroposterior axis; (3) same 3-DUS data set manipulation, fetus rotated over its longitudinal axis. Intra- and inter-observer reliability/agreement was determined with intra-class correlation coefficients and limits of agreement. In addition, we tested the method that provided the best reliability/agreement results using 15° and 9° of rotational step angles. The time taken to manipulate 3-DUS and determine fetal volume was recorded. The best intra- and inter-observer reliability/agreement results were observed when the fetus was rotated over its longitudinal axis. Reducing rotational step angle to 15° or 9° did not further improve reliability/agreement. The observer took approximately 1 min to determine fetal volume using this method. Our findings indicate that fetal volume should be determined by rotating the fetus over its longitudinal axis, at a rotational step angle of 30°, which is relatively fast and allows analysis of fetal volume with good reliability and agreement.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Primeiro Trimestre da Gravidez / Interface Usuário-Computador / Interpretação de Imagem Assistida por Computador / Ultrassonografia Pré-Natal / Imageamento Tridimensional / Tamanho Corporal / Feto Tipo de estudo: Diagnostic_studies Limite: Female / Humans / Pregnancy Idioma: En Revista: Ultrasound Med Biol Ano de publicação: 2013 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Primeiro Trimestre da Gravidez / Interface Usuário-Computador / Interpretação de Imagem Assistida por Computador / Ultrassonografia Pré-Natal / Imageamento Tridimensional / Tamanho Corporal / Feto Tipo de estudo: Diagnostic_studies Limite: Female / Humans / Pregnancy Idioma: En Revista: Ultrasound Med Biol Ano de publicação: 2013 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido