OUELLETTE & THEROUX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY OUELLETTE & THEROUX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Ultrasound scanning. Doctor uses a doppler ultrasound scanner to examine blood flow through the portal vein in a woman's abdomen. He holds a transducer on the patient's skin while watching the coloured image created on a monitor. The image on the monitor at right shows pulses of 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 or clots or aneurysms (swellings). The portal vein conveys blood to the liver from stomach and intestine. Ultrasound uses high-frequency sound waves to create an image.
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