SMS scnews item created by Philip Treharne at Thu 15 Mar 2007 1637
Type: Seminar
Distribution: World
Expiry: 21 Mar 2007
Calendar1: 21 Mar 2007 1400-1500
CalLoc1: Eastern Avenue Lecture Theatre (Level 1)

Applied Maths Seminar: Thompson -- The Inside of Blood Vessels


Speaker: Dr Rosemary Thompson, University of Sydney 

Title: The Inside of Blood Vessels 

DATE: Wednesday, March 21 
TIME: 2:00pm 
LOCATION: University of Sydney, Eastern Avenue Lecture Theatre (Level 1) 


Doppler ultrasound allows velocity measurements to be made within the lumen of a blood
vessel, without disturbing the flow.  The Doppler spectrum from an artery varies over
the cardiac cycle, and contains a range of frequency shifts, corresponding to the
velocity profile in the artery.  It also depends on the ultrasound system and the
intervening tissue which, inside a blood vessel, must include the vessel wall.  In
vascular disease plaques can develop within the vessel wall.  Typically these are
irregularly shaped, and neither very small nor very large compared to the ultrasound
wavelength.  We show that even with small physiological sound speed and density
variations, such vessel wall inclusions can lead to complicated modulations of the
nearby acoustic field.

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