MODEL RELEASED. Pregnancy ultrasound. Doctor carrying out a 3D real-time ultrasound scan on a pregnant woman, allowing her to see her unborn baby on a screen (upper left). The doctor is monitoring the scan on a computer monitor (not seen). Ultrasound scanning uses the reflected echoes of high-frequency sound waves to image an unborn baby. This safe, non-invasive method is used routinely in pregnancy to assess the growth and health of the developing foetus, and detect any abnormalities. Photographed in Belgium.