Abstract
This paper investigates how pressure gradients in a
pulsatile flow environment can be measured non-invasively using
ultrasound. The presented set-up is based on vector velocity fields
measured on a blood mimicking fluid moving at a peak flow rate
of 1 ml/s through a constricted vessel. Fields of pressure gradients
are calculated using the Navier-Stokes equations. Flow data are
acquired to a depth of 3 cm using directional synthetic aperture
flow imaging on a linear array transducer producing 1500 image
frames of velocity estimates per second. Scans of a carotid
bifurcation phantom with a 70% constriction are performed
using an experimental scanner. The performance of the presented
estimator is evaluated by comparing its results to a numerical
simulation model, which geometry is reconstructed from MRI
data. The study showed pressure gradients varying from 0 kPa/m
to 4.5 kPa/m with a maximum bias and standard deviation of
10% and 13%, respectively, relative to peak estimated gradient.
The paper concludes that maps of pressure gradients can be
measured non-invasively using ultrasound with a precision of
more than 85%
Original language | English |
---|---|
Title of host publication | Proceedings of IEEE International Ultrasonics Symposium |
Publisher | IEEE |
Publication date | 2014 |
Pages | 2257-2260 |
Publication status | Published - 2014 |
Event | 2014 IEEE International Ultrasonics Symposium - Hilton Hotel, Chicago, United States Duration: 3 Sept 2014 → 6 Sept 2014 https://ieeexplore.ieee.org/xpl/conhome/6917616/proceeding |
Conference
Conference | 2014 IEEE International Ultrasonics Symposium |
---|---|
Location | Hilton Hotel |
Country/Territory | United States |
City | Chicago |
Period | 03/09/2014 → 06/09/2014 |
Internet address |