A Flow Imaging and CW Spectral Analysis System

  • J. I. Mehi
  • R. S. C. Cobbold
  • K. W. Johnston
  • C. Royer
Part of the Acoustical Imaging book series (ACIM, volume 15)


A system for Doppler ultrasound flow imaging and CW spectral analysis of the carotid artery is described. The system uses a 24 element linear array with the long axis aligned perpendicular to the axis of the artery. Alteration of the array aperture function allows either a narrow beam to be produced for flow imaging, or a beam as wide as the artery to be produced for CW spectral analysis. For flow imaging, a narrow beam produced by an eight element crystal group is swept across the artery by sequentially shifting the group along the array. The system is designed to image flow along a line of approximately 2 cm length. A two-dimensional map of blood flow projected onto the plane of the surface of the skin is obtained by moving the array along the vessel axis using a one-dimensional position sensor. The CW spectral analysis mode of operation uses the middle twelve elements to produce a uniform 4 mm wide beam at a depth of 4 cm. Initial results with a partially tested system are described.


Flow Imaging Field Profile Narrow Beam Side Lobe Level Doppler Flow Image 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • J. I. Mehi
    • 1
  • R. S. C. Cobbold
    • 1
  • K. W. Johnston
    • 1
  • C. Royer
    • 1
  1. 1.Institute of Biomedical EngineeringUniversity of TorontoTorontoCanada

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