Fig. 3From: Which is more accurate measuring pulmonary artery resistance index or 4D lung volume for prediction of neonatal respiratory distress in preterm pregnancies?A–C Lung volume of pregnant patient 29 years old, GA = (32 wks + 3 ds) calculated by 3D US using VOCAL technique showing: the volume of right lung (A) and left lung (B) 30 cm3 and 28 cm3, respectively. C The pulmonary artery resistance index (RI) of the same patient measured by pulsed Doppler RI = 0.84. (RD neonate admitted to ICU)Back to article page