Navegando por Palavras-chave "Area"

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    Comparison between multiplanar and rendering modes in the assessment of fetal atrioventricular valve areas by 3D/4D ultrasonography
    (Sociedade Brasileira de Cirurgia Cardiovascular, 2012-09-01) Araujo Júnior, Edward [UNIFESP]; Rolo, Liliam Cristine [UNIFESP]; Simioni, Christiane [UNIFESP]; Nardozza, Luciano Marcondes Machado [UNIFESP]; Rocha, Luciane Alves da [UNIFESP]; Martins, Wellington P.; Moron, Antonio Fernandes [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); University of São Paulo Faculty of Medicine of Ribeirão Preto Department of Obstetrics and Gynecology; School of Ultrasound and Medicine of Ribeirão Preto Recycling; National Institute of Science and Technology (INCT) of Hormones and Women's Health
    OBJECTIVE: To compare the agreement of multiplanar and rendering modes in the assessment fetal atrioventricular valves (mitral and tricuspid) areas by three-dimensional (3D) ultrasonography using the software spatio-temporal image correlation (STIC). METHODS: We conducted a prospective cross-sectional study with normal pregnant women, with single fetuses, between 18-33 weeks. To measure the areas, we used the plan of four-chamber view. In the case of multiplanar, the plane was rotated on the axis Z form the heart to position at 9h. For rendering, the green line (region of interest - ROI) was placed from the atria of the heart perpendicular to the crux. The agreement was assessed by a Bland-Altman (limits of agreement) using the relative difference between the measures: ((rendering mode) - (multiplanar mode)) / (average). RESULTS: 328 fetuses were evaluated. We have not identified the occurrence of systematic error between methods: the average relative difference was 1.62% (-2.07% to 5.32%, confidence interval 95%) in the mitral and 1.77% (- 1.08% to 4.62%) in the tricuspid valve. The limits of agreement between methods were -65.26% to 68.51% for the mitral and -49.91% to 53.45% for the tricuspid. CONCLUSIONS: There was no systematic error between modes and thus the observed values for the area of fetal atrioventricular valves can be used for comparisons needs to be corrected. However, relatively large variations may be observed when repeating the measurement area by different modes.
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    Uma evolução histórica do conceito de área
    (Universidade Federal de São Paulo (UNIFESP), 2019-04-04) Silva Junior, Carlos Correa Da [UNIFESP]; Gama, Marcelo Cristino [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    The present work presents to the reader the historical evolution of the concept of the calculation of areas, carried out through a timeline, from the first records to the modern times, besides a work proposal that involves the deduction of the formulas of the areas of the main plane figures. The story begins about 1 550 BC, with the exhibition of the famous Papyrus of Rhind and its contents, in which are worked some practical problems of the daily life, as its resolutions, passing later by Euclides of Alexandria and Archimedes of Syracuse, by the appearance of a new Geometry and finally the creation of the Integral Calculus. This journey through the History of Mathematics is carried out through a panorama from the 16th century BC to the 17th century AD. Finally, it presents a didactic approach for the simple comprehension of the formulas of the main areas of plane figures, by means of relations of several figures with the area of previously determined rectangle.