Ultrasound assessment of biometric parameters of the head and brain and Doppler indices in cerebral arteries in sheep in the prenatal period

The aim of this study was to perform a biometric analysis of the head in sheep embryos/fetuses and to determine Doppler parameters in the middle cerebral artery and umbilical artery in 12 prenatal sheep. Using B-Mode ultrasound, the biparietal distance (BPD), occipital-nasal length (ONL), eye length and width, choroid plexus width, and turbinate complex width were determined. Peak systolic velocity (PSV), end diastolic velocity (EDV), PSV/EDV ratio, resistance index (RI) and pulsatility index (PI) were also determined. From the 26th to the 110th day of pregnancy, a progressive increase in BPD and ONL was observed (p