Comparison of two- and three-dimensional ultrasonography in lung volume measurement of normal fetuses
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Edward Araujo Júnior
Abstract
Aim: The purpose of this study was to compare the two- and three-dimensional methods for measuring fetal lung volume of normal fetuses.
Methods: A cross-sectional study was performed with 51 normal pregnant women between 20 and 35 weeks. The ellipsoid formula (X*Y*Z*0.52) was used for volume calculation with the two-dimensional (2D) method. With the VOCALTM (Virtual Organ Computer-aided Analysis) method, a rotation angle of 30° was used. Intraclass correlation coefficient (ICC), paired Student's t-test and Bland-Altman plots were used to compare the techniques. To calculate the intraobserver variability we used the ICC and compared the means between the two measures using the paired Student's p-test.
Results: VOCALTM and 2D methods were highly correlated (ICC=0.919 and 0.873 for the right and left lungs, respectively), however, there was a disagreement. The fetal lung volume means calculated by the 2D method were always overestimated in relation to the means obtained by the VOCALTM, for the right lung (24.02 mL×19.15 mL; P<0.001), as well as for the left (16.03 mL×13.77 mL; P=0.002). As for the intraobserver variability, a good reproducibility was observed for the volume measurement of the left lung by the 2D technique (mean=0.40 mL; P=0.57) and by the VOCALTM (mean=−0.22 mL; P=0.63). The 2D method, however, presented low reproducibility for the right lung (mean=1.73 mL; P=0.31).
Conclusion: The two-dimensional method had low agreement and low reproducibility in relation to the three-dimensional method for measurement of fetal lung volume in normal fetuses.
©2007 by Walter de Gruyter Berlin New York
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Articles in the same Issue
- Intrauterine growth restriction and risk for arterial hypertension: a causal relationship?
- Clinical-radiological features of fractures in premature infants – a review
- Scientific and religious controversies about the beginning of human life: the relevance of the ethical concept of the fetus as a patient
- The status of the embryo in Buddhism: opinions on scientific and religious controversies about the beginning of human life
- The calcium binding protein, S100B, is increased in the amniotic fluid of women with intra-amniotic infection/inflammation and preterm labor with intact or ruptured membranes
- Validity of amniotic fluid index in preterm rupture of membranes
- Activity of adenosine deaminase in mothers who have conceived a fetus with central nervous system malformations
- Ductus venosus Doppler measurement during labor
- Fetal scalp pH and ST analysis of the fetal ECG as an adjunct to cardiotocography to predict fetal acidosis in labor / A multi-center, case controlled study
- Comparison of two- and three-dimensional ultrasonography in lung volume measurement of normal fetuses
- MRI and multiplanar 3D ultrasound compared in the prenatal assessment of enlarged posterior fossa
- Monochorionic twins in which at least one fetus has a congenital heart disease with or without twin-twin transfusion syndrome
- Enriched post-discharge formula versus term formula for bone strength in very low birth weight infants: a longitudinal pilot study
- Which information will be given to parents of preterm infants – a comparison of estimates and local data
- Intestinal trefoil factor in treatment of neonatal necrotizing enterocolitis in the rat model
- Impact of being small-for-gestational age on survival and long-term outcome of extremely premature infants born at 23–27 weeks' gestation
- Gastroschisis: brief early history
- Reply
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