AJ PHOTO / HOP AMERICAIN / SCIENCE PHOTO LIBRARY AJ PHOTO / HOP AMERICAIN / SCIENCE PHOTO LIBRARY
Doppler ultrasound. Doctor holding an ultrasound transducer next to a patient's abdomen to study her organs. Doppler ultrasound builds up pictures of body structures from the echoes of high frequency sound waves produced by the transducer. 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. Ultrasound is good for imaging hollow and fluid-filled structures. This scan (upper centre) is normal.
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