Ultrasonic colour flow imaging.

  title={Ultrasonic colour flow imaging.},
  author={Peter N. T. Wells},
  journal={Physics in medicine and biology},
  volume={39 12},
Real-time ultrasonic colour flow imaging, which was first demonstrated to be feasible only about a decade ago, has come into widespread clinical use. Ultrasound is scattered by ensembles of red blood cells. The ultrasonic frequency that gives the best signal-to-noise ratio for backscattering from blood depends on the required penetration. The frequency of ultrasound backscattered from flowing blood is shifted by the Doppler effect. The direction of flow can be determined by phase quadrature… CONTINUE READING
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