Navegando por Palavras-chave "three-dimensional imaging"
Agora exibindo 1 - 11 de 11
Resultados por página
Opções de Ordenação
- ItemSomente MetadadadosAvaliação do volume de membros fetais aferidos pela ultrassonografia tridimensional e correlação com o índice de massa corpórea dos recém-nascidos(Universidade Federal de São Paulo (UNIFESP), 2014-11-30) Cavalcante, Rafael de Oliveira [UNIFESP]; Araujo Junior, Edward Araujo Junior [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Objective: To assess the usefulness of fetal limb volumes as predictors to low postnatal body mass index (BMI) using three-dimensional ultrasonography (3DUS) with the extended imaging virtual organ computer-aided analysis (XI VOCAL) method. Methods: This was prospective cross-sectional study which assessed 300 singleton pregnancies between 33 and 41 weeks of gestation. The Hadlock 4 formula was used to estimate fetal weight (EFW). The XI VOCAL 10 planes method was used to assess the fetal upper-arm and thigh volumes. Postnatal anthropometry was assessed using the BMI and it was considered low (?10th percentile) or normal (>10th percentile). We determined receiver operating characteristic (ROC) curves and their respective areas under the curves for the percentiles of EFW, fetal thigh and upper-arm volumes. Results: Of the 300 newborns, BMI was ?10th percentile for 21 and >10th percentile for 279. The area under the ROC curve for EFW, fetal upper-arm and thigh volume, were 0.801, 0.924, and 0.930, respectively. We determined the sensitivity and specificity of these three parameters for predicting postnatal low BMI and we found the values of 85.70% and 65.60%, for EFW; 90.48% and 88.17%, for fetal thigh volume; and 76.19% and 92.47%, for fetal upper-arm volume; respectively. Conclusion: Fetal limb volumes estimated by 3DUS using the XI VOCAL method were effective predictors of low postnatal BMI.
- ItemSomente MetadadadosComparison 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(Taylor & Francis As, 2010-03-01) Machado Nardozza, Luciano Marcondes [UNIFESP]; Rolo, Liliam Cristine [UNIFESP]; Araujo Junior, Edward [UNIFESP]; Nowak, Paulo Martin [UNIFESP]; Bortoletti Filho, Joao [UNIFESP]; Moron, Antonio Fernandes [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)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
- ItemSomente MetadadadosComparison of placental volume in early pregnancy using multiplanar and VOCAL methods(W B Saunders Co Ltd, 2008-03-01) Nowak, P. M. [UNIFESP]; Nardozza, L. M. M. [UNIFESP]; Araujo, E. [UNIFESP]; Rolo, L. C. [UNIFESP]; Moron, A. F. [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)In this study we aimed to compare the-multiplanar and VOCAL (Virtual Organ Computer-aided AnaLysis) methods in the evaluation of placental volume during the first trimester of pregnancy. This was a prospective cross-sectional study involving 37 pregnant women between 7 and 10 weeks of gestation. All volumetric measurements were performed by a single examiner using an endocavitary volumetric probe (3D5-8EK). Placental volume was measured on three-dimensional ultrasound by the VOCAL method using 12 degrees and 30 degrees rotational angles and by the multiplanar method using sequential sections of the placenta obtained at intervals of 1.0 mm. Pearson's correlation coefficient (r) was used to evaluate the relation between placental volume and gestational age. the interclass correlation coefficient (ICC), paired Student's t-test (P) and Bland-Altman plot were used to compare both methods. There was a strong correlation between placental volume and gestational age (r = 0.791 for VOCAL 12 degrees, r = 0.801 for VOCAL 30 degrees and r = 0.783 for multiplanar). There was a strong correlation between placental volume measured by the VOCAL 12 degrees and the VOCAL 30 degrees (ICC = 0.994, confidence interval [0.998; 0.997]) and the multiplanar methods (ICC = 0.991, confidence interval [0.983; 0.995]). First trimester placental volume measurements obtained using the multiplanar and VOCAL methods are concordant. (c) 2007 Elsevier B.V. All rights reserved.
- ItemSomente MetadadadosComparison of the two-dimensional and multiplanar methods and establishment of a new constant for the measurement of fetal lung volume(Taylor & Francis Ltd, 2008-01-01) Junior, Edward Araujo [UNIFESP]; Nardozza, Luciano Marcondes Machado [UNIFESP]; Pires, Claudio Rodrigues [UNIFESP]; Filho, Helio Antonio Guimaes [UNIFESP]; Moron, Antonio Fernandes [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Objectives. To compare the two-dimensional (2D) and multiplanar methods in the measurement of lung volume in normal fetuses, to obtain a new constant to be incorporated into the 2D equation, and to apply the new equation in fetuses with pulmonary hypoplasia (PH) confirmed postnatally.Methods. A cross-sectional study was performed on 51 pregnant women at between 20 and 35 weeks of gestation. the ellipsoid formula (x x y x z x 0.52) was used to calculate lung volume by the 2D method. A sequence of multiple planes with 2.0-mm intervals was used with the multiplanar method. in order to compare the techniques, the intra-class correlation coefficient (ICC) and the Student's t-test (p) were used. First-order linear regressions were used to establish a new constant, with three-dimensional (3D) lung volume as dependent variable and gestational age and 2D volume as independent variables. in order to validate it, the new equation was applied to 11 fetuses with confirmed lethal PH.Results. the mean volumes obtained by the 2D method were overestimated when compared to the multiplanar method (right lung: 23.87 vs. 18.26mL, respectively, p < 0.001 and left lung: 16.18 vs. 14.33mL, respectively, p=0.008). Using a first-order polynomial regression, new constants were obtained for the right lung (0.152) and for the left lung (0.167). When compared to the traditional formula, the new equation presented higher sensitivity (18.1%) in predicting lethal PH.Conclusion. the recalculated 2D equation can be a promising alternative to 3D ultrasonography in the prediction of PH.
- ItemSomente MetadadadosDiagnosis of ovarian torsion by three-dimensional power Doppler in first trimester of pregnancy(Blackwell Publishing, 2008-04-01) Zanforlin Filho, Sebastiao M.; Araujo Junior, Edward [UNIFESP]; Serafini, Paulo; Guimaraes Filho, Helio A. [UNIFESP]; Pires, Claudio R. [UNIFESP]; Nardozza, Luciano M. M. [UNIFESP]; Moron, Antonio F. [UNIFESP]; Ultrasound Training Ctr São Paulo CETRUS; Universidade Federal de São Paulo (UNIFESP); Huntington Ctr Reprod MedThree-dimensional ultrasonography in power Doppler mode (3D power Doppler) allows the appropriate quantitative assessment of the ovarian tissue vascularization. the present case is of an ovarian torsion in a pregnant woman at 6.5 weeks with ovarian hyperstimulation syndrome due to in vitro fertilization. Gray-scale images of endovaginal two-dimensional ultrasonography revealed enlargement of the right ovary and multiple peripheral follicles. Two-dimensional ultrasonography in color Doppler mode revealed the absence of venous flow and reduction in arterial flow to the impaired ovary. 3D power Doppler allowed the appropriate quantitative assessment of tissue vessel density of the impaired ovary, which greatly influenced the decision for conservative surgical treatment. the 3D power Doppler assessment performed after the surgery confirmed the integrity of the ovarian tissue. 3D power Doppler can help in the selection of patients with ovarian torsion for conservative surgical treatment.
- ItemSomente MetadadadosEmbryo vascularization by three-dimensional power Doppler ultrasonography at 7-10 weeks of pregnancy(Walter de Gruyter Gmbh, 2009-07-01) Bortoletti Filho, Joao [UNIFESP]; Marcondes, Luciano [UNIFESP]; Nardozza, Machado [UNIFESP]; Araujo Junior, Edward [UNIFESP]; Rolo, Liliam Cristine [UNIFESP]; Nowak, Paulo Martin [UNIFESP]; Guimaraes Filho, Helio Antonio [UNIFESP]; Moron, Antonio Fernandes [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Aim: Assess vascular indices of 7-10 week embryos using three-dimensional power Doppler (3DPD) and correlate them with the crown-rump length (CRL).Methods: This cross-sectional study included 65 healthy pregnancies between 7 and 10 weeks. the three-dimensional volume of the embryo was obtained using an endocavitary volumetric transducer and the VOCAL (Virtual Organ Computer-aided Analysis) method, with a 128 rotation angle and 15 sequential planes. the vascularization (VI), flow (FI) and the vascular and flow (VFI) indices were obtained using 3DPD and the mean, median, standard deviation, maximum and minimum values were calculated for each gestational age. Pearson's correlation coefficient (r) was used to evaluate the correlation between vascular indices and CRL.Results: the VI ranged from 0.77 to 41.67, mean 14.68 (+/- 8.60), the FI went from 25.71 to 139.50, mean 90.61 (+/- 21.51) and the VFI from 0.20 to 81.57, mean 15.69 (+/- 12.42). the correlation between CRL and all 3D power Doppler vascular indices was low (VI - r=-0.073, P=0.566; FI - r=0.173, P=0.168 and VFI - r=-0.004, P=0.974).Conclusion: 3D power Doppler vascular indices in 7 - 10 week embryos do not correlate with CRL.
- ItemSomente MetadadadosMeasurement of embryo volume at 7-10 weeks' gestation by 3D-sonography(Informa Healthcare, 2009-01-01) Rolo, Liliam Cristine [UNIFESP]; Nardozza, Luciano Marcondes Machado [UNIFESP]; Araujo, E. [UNIFESP]; Nowak, Paulo Martin [UNIFESP]; Bortoletti Filho, João [UNIFESP]; Moron, Antonio Fernandes [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)The embryo volume (EV) is an important parameter for the early diagnosis of growth disorders. the objective of this study was to establish normal data for EV at 7-10 weeks' gestation with three-dimensional ultrasonography (3DUS). A cross-sectional study involving 50 pregnancies was performed. An endocavitary volumetric transducer (3D5-8EK) was used for all measurements. the VOCAL (Virtual Organ Computer-aided AnaLysis) method with a 30 rotation angle was used for volumetric calculations. To analyse the correlation between EV and gestational age (GA) and crown-rump length (CRL), regression models were constructed. the mean, standard deviation, median, minimum and maximum values were calculated for each gestational age. the intraclass correlation coefficient (ICC) was used to determine inter- and intraobserver reliability. There was a significant correlation between EV and GA and CRL (R2=0.951 and R2=0.880, respectively). the exponential equation was the model that best expressed the correlation between these variables: [EV=exp(0.9481GA-8.117)] and [EV=0.0871 exp(0.1207CRL)]. the mean EV ranged from 0.23cm3 (95% CI 0.03-0.42) at 7 weeks to 3.91cm3 (95% CI 3.85-3.96) at 10 weeks. Inter- and intraobserver correlation were excellent (ICC=0.993 and 0.999, respectively). Embryo volume assessed through 3DUS increased from 7 to 10 weeks. Reference limits were generated for first trimester EV using 3DUS.
- ItemSomente MetadadadosPlacenta: angiogenesis and vascular assessment through three-dimensional power Doppler ultrasonography(Springer, 2008-03-01) Guimaraes Filho, Helio Antonio [UNIFESP]; Dias da Costa, Lavoisier Linhares; Araujo, Edward [UNIFESP]; Machado Nardozza, Luciano Marcondes [UNIFESP]; Nowak, Paulo Martin [UNIFESP]; Moron, Antonio Fernandes [UNIFESP]; Mattar, Rosiane [UNIFESP]; Pires, Claudio Rodrigues [UNIFESP]; ECOCLINICA; Universidade Federal de São Paulo (UNIFESP)The placenta is fundamental for fetal development. It combines the functions of an endocrine organ, kidneys, lungs and intestines, purifying catabolites, oxygenating and nourishing the conceptus. Its fetal portion is the largest part develops from the chorionic sac. the maternal portion, which is smaller, is originated in the endometrium, more specifically in the decidua basalis. the placenta starts its function closer to the fourth week of gestation, when anatomical arrangements for the physiological exchanges are already established. the circulatory function of the placenta appears at an early stage of embryo-placental development and it is strongly related to fetal growth, to the placental size and to uterine and umbilical blood flows. Therefore, an adequate placental angiogenesis is critical for the establishment of a normal placental vascularization with consequent normal development of the fetus. in this review article, the authors discuss about placental ontogeny, focusing on the main aspects of its normal development, and about the recent advances in ultrasonography for the study of the vascular architecture of the placenta through three-dimensional power Doppler ultrasonography.
- ItemSomente MetadadadosPostnatal evaluation of schizencephaly by transfontanellar three-dimensional sonography(Wiley-Blackwell, 2007-07-01) Araujo Junior, Edward; Leite, Alexis Paiva; Pires, Claudio Rodrigues; Giumaraes Filho, Helio Antonio; Zanforlin Filho, Sebastiao Marques; Machado Nardozza, Luciano Marcondes; Moron, Antonio Fernades; Ultrasound Training Ctr São Paulo; Universidade Federal de São Paulo (UNIFESP)Schizencephaly is a rare anomaly of neuronal migration characterized by the presence of brain clefts that communicate with the lateral ventricles. Type I is characterized by clefts with fused lips or margins, not communicating with the subarachnoid space. Type II is characterized by longer clefts that communicate with the subarachnoid space. Neonatal diagnosis of schizencephaly on transfontanellar two-dimensional (2D) sonography is rare, with only 1 report in the medical literature. the major limitation of 2D sonography is its inability to assess neonatal prognosis. There are no reports on MEDLINE about the use of transfontanellar three-dimensional (3D) sonography in the assessment of schizencephaly. We present a case of type II schizencephaly diagnosed on the 29th week of gestation with 2D sonography and describe the main findings with 3D sonography in surface and transparency modes performed in the neonatal period via the fontanel. (c) 2007 Wiley Periodicals, Inc.
- ItemSomente MetadadadosThree-dimensional power Doppler placental vascularisation indices in early pregnancy: A pilot study(Informa Healthcare, 2011-05-01) Araujo Junior, E. [UNIFESP]; Nardozza, L. M. M. [UNIFESP]; Nowak, P. M. [UNIFESP]; Rolo, L. C. [UNIFESP]; Guimaraes Filho, H. A. [UNIFESP]; Moron, A. F. [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)The objective of our study was to assess 1st trimester placental vascularisation using three-dimensional (3D) power Doppler vascular indices. A cross-sectional study was used involving 41 normal pregnancies from 7 to 10 + 6 weeks. Placental volume was obtained using the 30 degrees virtual organ computer-aided analysis (VOCAL) method. the mean, median, standard deviation (SD), minimum and maximum values were calculated for three vascular indices: the VI, vascularisation index; the FI, flow index and the VFI, vascularisation and flow index. Pearson's correlation coefficient (r) was used to assess the correlation between vascular indices and crown-rump length (CRL). Our results showed mean (+/- SD) values ranged from 8.66 +/- 12.04 to 15.34 +/- 13.89 for the VI, from 63.83 +/- 43.61 to 109.22 +/- 33.87 for the FI and from 9.52 +/- 13.86 to 20.59 +/- 22.97 for the VFI. There was no correlation between CRL and VI (r = 0.073, p = 0.630) nor VFI (r = 0.147 and p = 0.037); there was a weak correlation between CRL and FI (r = 0.332, p = 0.037). It was concluded that the FI was the only 3D power Doppler vascular index that was correlated with CRL between 7 and 10 + 6 weeks' gestation.
- ItemSomente MetadadadosYolk sac volume assessed by three-dimensional ultrasonography using the VOCAL method(Wiley-Blackwell, 2008-01-01) Rolo, Liliam Cristine [UNIFESP]; Machado Nardozza, Luciano Marcondes [UNIFESP]; Araujo, Edward [UNIFESP]; Nowak, Paulo Martin [UNIFESP]; Moron, Antonio Fernandes [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Objectives. Establish normative data for yolk sac volume (YSV) at 7 - 10 weeks of gestation assessed by transvaginal three-dimensional ultrasonography (3D-US) using the VOCAL method and analyze its correlation with gestational age (GA) and crown-rump length (CRL). Methods. A cross-sectional study involving 62 normal pregnancies was performed to assess YSV from 7 to 10 weeks of gestational age. An endocavitary volumetric transducer (3D5-8EK) was used for all measurements. the VOCAL (Virtual Organ Computer-aided AnaLysis) method with a 30 rotation angle was used for volumetric calculations. Regression models were constructed to analyze the correlation between YSV and GA or CRL the mean, standard deviation, median, minimum and maximum values were calculated for each gestational age. Results. There was a poor correlation between YSV and GA or CRL. the quadratic regression was the model that best expressed the correlation between these variables: R2=0.188 for GA and R2=0.203 for CRL. the mean YSV went from 0.063 cm(3) (95% CI: 0.047; 0.080) at 7 weeks to 0.164 cm(3) (95% CI 0.095; 0.232) at 10 weeks. Conclusion. Reference limits were generated for first trimester YSV using 3D-US. There was a poor correlation between YSV and GA or CRL.