Sonographic QUantification of Venous Circulation In the Preterm Brain

No additional ultrasound examinations, specifically for the purpose of this study, will be performed. Instead, with each routine ultrasound examination, additional images on top of the routine frames will be collected. Those images will document the velocity and flow in the internal cerebral veins bilaterally using the standard Color Doppler tech-nique. Taking these additional images will prolong the time of ultrasound examination only minimally (with a few minutes).