Estimation of Fetal Lung Volume Using Echo-Planar Magnetic Resonance Imaging

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Abstract
To measure fetal lung volume by echo-planar magnetic resonance imaging (MRI). Twenty singleton pregnancies were scanned on one occasion each using echo-planar imaging, a form of MRI. Cases of fetal growth restriction and macrosomia were excluded from the study. Lung volumes increased with gestational age from 21 mL at 23 weeks' gestation to a maximum of 94 mL at term. The relation between lung volume and gestational age was exponential. The ratio of lung volume to total fetal volume decreased with gestational age. The use of echo-planar imaging allows estimation of normal fetal growth; it has clear applications for the diagnosis of lung hypoplasia and potential use for the study of lung maturity.

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