GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY
Ultrasound scanning. Doctor uses a doppler ultrasound scanner to examine a blood vessel in a man's abdomen. She holds a transducer on the patient's skin while watching the coloured image created on a monitor (at upper right). The image reveals blood flow. Doppler ultrasound scanning is used to examine blood flow in the body. Turbulence in the flow of blood can be detected, which might reveal narrowing of blood vessels due to fatty plaques (atherosclerosis), a blood clot, or aneurysm (swelling of a blood vessel). Ultrasound may also be used to detect gall or kidney stones. Ultrasound uses high- frequency sound waves to create an image.
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