Navegando por Palavras-chave "Organ volume"
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- ItemAcesso aberto (Open Access)Avaliação do volume da placenta no primeiro trimestre de gestação por meio da ultrassonografia tridimensional utilizando o método XI VOCAL(Colégio Brasileiro de Radiologia e Diagnóstico por Imagem, 2010-04-01) Nowak, Paulo Martin [UNIFESP]; Nardozza, Luciano Marcondes Machado [UNIFESP]; Araujo Júnior, Edward [UNIFESP]; Rolo, Liliam Cristine [UNIFESP]; Guimarães Filho, Hélio Antonio [UNIFESP]; Moron, Antonio Fernandes [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)OBJECTIVE: To determine reference values for placental volume at 7 to 10 + 6 weeks of gestation by means of three-dimensional ultrasonography with the XI VOCAL (eXtended Imaging Virtual Organ Computer-aided Analysis) method. MATERIALS AND METHODS: A cross-sectional study was developed with 70 pregnant women at 7 to 10 + 6 weeks of gestation. The XI VOCAL method with ten sequential adjacent planes was utilized in the volume calculations. Means, medians, standard deviation, minimum and maximum values for placental volume were calculated. A scatter plot adjusted by the determination coefficient (R²) was constructed to correlate placental volume and gestational age. RESULTS: Mean placental volume ranged from 4.6 cm³ (2.6-8.6 cm³) to 28.9 cm³ (11.4-66.9 cm³). The placental volume (PV) has shown to be highly correlated with the gestational age (GA) and the best fit equation was [PV = exp(0.582 × GA + 0.063); R² = 0.82]. CONCLUSION: Reference values for placental volume in the first gestational trimester were determined with the XI VOCAL method.
- ItemSomente MetadadadosCorrelation of the fetal cerebellar volume with other fetal growth indices by three-dimensional ultrasound(Taylor & Francis Ltd, 2007-08-01) Araujo Junior, Edward [UNIFESP]; Pires, Claudio Rodrigues [UNIFESP]; Nardozza, Luciano Marcondes Machado [UNIFESP]; Guimarães Filho, Hélio Antonio [UNIFESP]; Moron, Antonio Fernandes [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Objective. To verify the correlation of fetal cerebellar volume by three- dimensional ultrasound ( 3D US) with other indices of fetal growth in normal fetuses.Methods. This was a longitudinal prospective study involving 52 normal pregnant women between 20 and 32 weeks of gestation. the assessments of the fetal cerebellar volume were carried out at intervals of two weeks, and the method used was VOCAL ( virtual organ computer- aided analysis) with a 308 rotation angle. At each assessment, the following biometric indices were evaluated using the two- dimensional method: biparietal diameter, head circumference, transverse cerebellar diameter, femur length, and estimated fetal weight. We used Pearson's correlation coefficient to evaluate the correlation between fetal cerebellar volume and these indices; we also used polynomial regression analysis with fetal cerebellar volume as the dependent variable and the other indices as the independent variable.Results. the fetal cerebellar volume was highly correlated with gestational age ( r 0.94; p < 0.001) and with all other fetal growth indices ( p < 0.001).Conclusions. the assessment of the fetal cerebellar volume by 3D US is an important tool to evaluate fetal growth.
- ItemEmbargoCurva de referência do volume do braço e coxa fetal por meio da ultrassonografia tridimensional usando o método XI VOCAL(Universidade Federal de São Paulo (UNIFESP), 2011-03-30) Cavalcante, Rafael de Oliveira [UNIFESP]; Araujo Júnior, Edward [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Objective: To determine reference ranges for fetal upper arm and thigh volumes by three-dimensional (3D) ultrasonography using and the eXtended Imaging Virtual Organ Computer-aided AnaLysis method (XI VOCAL) method. Methods: This cross-sectional study enrolled 425 healthy pregnant women between 20 and 40 weeks of gestation. For volumetric calculation, XI VOCAL method was performed in 10 sequential areas along the axial cross-section, having proximal and distal epiphyses as references. In order to evaluate the correlation between fetal limb volume and gestational age (GA) second degree polynomial regression models were created determining the 5th, 10th, 25th, 50th, 75th, 90th and 95th percentiles. Intraclass correlation coefficient (ICC) was used to evaluate intra and interobserver reproducibility. Results: Mean fetal upper arm volume varied from 4.59 ± 1.18 (3.10 – 7.40 cm3) to 53.87 ± 10.72 cm3 (40.30 – 76.60 cm3) and thigh volume from 8.00 ± 1.86 (3.90 – 11.90 cm3) to 122.14 ± 14.90 cm3 (105.0 – 153.50 cm3). Fetal limb volumes were highly associated with GA: upper arm volume = 34.26 – 3.62xGA + 0.11xGA2 (R2= 0.913) and thigh volume = 68.70 – 7.63xGA + 0.23xGA2 (R2= 0.946). Intra and interobserver reproducibility were excellent with an ICC= 0.997 and 0.996, for fetal upper arm and thigh volumes, respectively. Conclusions: The reference ranges of fetal upper arm and thigh volumes were determined by 3D-ultrasound imaging using the XI VOCAL method and were found to be highly reproducible.
- ItemSomente MetadadadosEvaluation of Placental Volume at 7-10+6 Weeks of Pregnancy by 3D-Sonography(W B Saunders Co Ltd, 2009-07-01) Nardozza, L. M. M. [UNIFESP]; Nowak, P. M. [UNIFESP]; Araujo Junior, E. [UNIFESP]; Guimaraes Filho, H. A. [UNIFESP]; Rolo, L. C. [UNIFESP]; Torloni, M. R. [UNIFESP]; Moron, A. F. [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)The aim of the study was to establish normative data for placental volume (PV) at 7-10+6 weeks of gestation using three-dimensional ultrasound (3DUS). the cross-sectional study involved 70 healthy pregnancies between 7 and 11 weeks. the VOCAL (Virtual Organ Computer-aided Analysis) method with a 30 rotation angle and six planes was used for volumetric calculations. Regression models were constructed to assess the correlation between PV and crown-rump length (CRL) adjusted by the determination coefficient (R(2)). the method proposed by Royston and Wright was used to establish the 2.5th; 10th; 50th; 90th and 97.5th percentiles (percentile = mean + K x SD). the intraclass correlation coefficient (ICC), Bland-Altman graphs and Student's paired t-tests were used to assess intra- and interobserver variability. PV ranged from 1.7 to 42.6 cm(3), with a mean of 13.6 cm(3) ( 9A cm(3)). There was a strong correlation between PV and CRL; the exponential equation was the model that best expressed the correlation between them (R(2) = 0.76). for CRL between 9 and 40 mm, the mean PV increased 10.5 times, while CRL increased only 4.4 times. Inter- and intraobserver correlation were excellent (ICC=0.979 and 0.971, respectively). Bland-Altman graphs indicated a good reproducibility with a mean intraobserver and interobserver difference of 0.2 cm(3) (95% CI: -0.7-1.2 cm(3)) and -0.2 cm(3) (95% CI: -1.3-0.9 cm(3)), respectively. Reference limits were generated for first trimester PV assessed by 3DUS using the VOCAL method. There is a strong correlation between PV and CRL Placental volume obtained through this method was highly reproducible. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.