Navegando por Palavras-chave "histogram"

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    Assessment of fetal lung maturity by ultrasound: objective study using gray-scale histogram
    (Informa Healthcare, 2015-04-01) Avritscher Beck, Ana Paula [UNIFESP]; Araujo Junior, Edward [UNIFESP]; Figueiredo Stochero Leslie, Ana Teresa [UNIFESP]; Camano, Luiz [UNIFESP]; Moron, Antonio Fernandes [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Objective: To evaluate lung maturity using ultrasound (US), comparing the subjective and gray-scale histogram (GSH) techniques.Methods: A total of 77 single pregnancies were evaluated and divided into the following two groups: 11 women of gestational age 28 to 35 + 6 weeks and 66 women >= 36 weeks. the women underwent to emergency or planned cesarean section, according to fetal-maternal indications. the US was performed on the mean sagittal plane of the fetal torso, in order to observe the lung and hepatic areas. Fetal lung maturity was evaluated subjectively and through GSH. After delivery, the incidence of respiratory distress in the newborn was evaluated. the analyses were considered to be correct or incorrect, and comparisons were made using the McNemar test. in order to compare lung/hepatic echogenicity using GSH in groups with and without respiratory distress, the Student's t-test was used.Results: the subjective evaluation identified 41 cases (53.2%) correctly and 36 (46.8%) incorrectly, while GSH found 58 (75.3%) correctly and 19 (24.7%) incorrectly (p = 0.006). There was a significant difference in mean lung/hepatic echogenicity between the groups with and without respiratory distress (1.05 versus 1.26; p = 0.002). in the group of 28 to 35 + 6 weeks, GSH presented sensitivity, specificity and accuracy in predicting respiratory distress of 61.9%, 89.1% and 81.6%, respectively.Conclusion: the evaluation of fetal lung maturity through GSH was more effective than the subjective method in predicting respiratory distress among newborns.
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    Transvaginal grey scale histogram of the cervix at 20-25 weeks of pregnancy
    (Wiley-Blackwell, 2010-10-01) Furtado, Marcio R. [UNIFESP]; Pires, Claudio R. [UNIFESP]; Araujo Junior, Edward [UNIFESP]; Souza, Eduardo de [UNIFESP]; Nardozza, Luciano M. M. [UNIFESP]; Moron, Antonio F. [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Aim:To assess the echogenicity of the cervical stroma and area surrounding the cervical canal (cervical gland area - CGA) using grey scale histogram (GSH) in pregnancies between 20 and 25 weeks.Methods:Cross-sectional study involving 149 pregnancies in the second trimester. Transvaginal sonography was performed to measure cervical length (biometric evaluation), assess the CGA and detect cervical funnelling (morphologic evaluation). the GSH was used for the objective assessment of the cervical stroma and CGA in the mid portion of the cervix. Mean, minimum, maximum and standard deviation measurements were obtained on the GSH and the CGA/stroma ratio was calculated. Intra-observer and inter-observer reproducibility were assessed using the intraclass correlation coefficient (ICC).Results:Mean cervical length was 42.37 +/- 7.05 mm (range 12-54 mm). Funnelling was detected in four women (2.7%) and one of these also had absent CGA. the mean GSH stroma value was 103 +/- 25 (53-160) and the mean CGA value was 64.5 +/- 23 (13-167). the mean CGA/stroma ratio was 0.62 +/- 0.14 (0.24-1.29). Intra- and inter-observer reproducibility was excellent with ICC of 0.975 and 0.922 respectively.Conclusion:There are large differences in the texture of the cervical stroma and CGA on GSH allowing the objective differentiation of the two areas. the CGA/stroma ratio allows the objective assessment of the absence or presence of the CGA.