IAN HOOTON / SCIENCE PHOTO LIBRARY IAN HOOTON / SCIENCE PHOTO LIBRARY
Doppler ultrasound being used on a pregnant woman. Doppler ultrasound builds up pictures of body structures from the echoes of high frequency sound waves. The doppler effect, in which a wave reflected from a moving body has its wavelength shifted, allows determination of the speed and smoothness of blood flow and other movements.
Model release available. Property release not required.