A Flow Imaging and CW Spectral Analysis System
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.
KeywordsFlow Imaging Field Profile Narrow Beam Side Lobe Level Doppler Flow Image
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- 1.Reid, J.M., Spencer, M.P. and Davis, D.L., “Ultrasonic Doppler Imaging System”, pp. 1127–1235 in “Ultrasound in Medicine”., D.N. White and R. Brown (Eds.), Vol. 3B, Plenum Press, New York, 1977.Google Scholar
- 5.Powis, P.L., “Angiodynography: A New Real-Time Look at the Vascular System,” Applied Radiology, 15:55–59, 1986.Google Scholar
- 6.Arenson, J.W., Cobbold, R.S.C., and Johnston, K.W., “Real-Time Two-Dimensional Blood Flow Imaging Using a Doppler Ultrasound Array”, pp. 529–538 in “Acoustic Imaging”, E.A. Ash and CR. Hill (Eds.), Vol. 12, Plenum Press, New York, 1982.Google Scholar
- 10.Arenson, J.W., Cobbold, R.S.C., and Johnston, K.W., “Computer Aided Design of Ultrasonic Imaging Arrays”, Digest 8th CMBES Conf., pp.162–163, 1980.Google Scholar
- 11.Mehi, J.I. An Ultrasound Array for Arterial Doppler Flow Imaging and Spectral Analysis, MASc. Thesis, University of Toronto, 1985.Google Scholar