A new pulsatile flow visualization method using a photochromic dye with application to Doppler ultrasound |
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Authors: | K Poots Dr R S C Cobbold K W Johnston R Appugliese M Kassam P E Zuech R L Hummel |
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Institution: | (1) Institute of Biomedical Engineering, University of Toronto, M5S 1A4 Toronto, Ontario, Canada |
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Abstract: | A nonintrusive method for the visualization of pulsatile flow velocity profiles is described. The method is based on the use
of a photochromic dye that is added to the fluid being studied and a nitrogen laser which excites the dye producing a marker
“line” whose movement can be photographed. A microcomputer is used as a system controller, to coordinate the system timing
and to manage the data transfer. The method used for analysis of the photographs to determine the velocity profiles is described.
Examples are presented of instantaneous velocity profiles obtained from velocity waveforms that are similar to those of the
femoral artery. In addition, application of the system for studying the relationship between Doppler ultrasound spectral recordings
and flow velocity profiles is discussed. |
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Keywords: | Flow visualization Photochromic dye Pulsatile flow Doppler ultrasound |
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