Fig. 2From: 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 23 years old, GA = (34 wks + 0 ds) calculated by 3D US using VOCAL technique showing: the volume of right lung (A) and left lung (B) 31 cm3 and 29 cm3, respectively. C The pulmonary artery resistance index (RI) of the same patient measured by pulsed Doppler RI = 0.74. (Neonate with mild RD admitted to ICU for 2 days)Back to article page