Abstract
A new method for directional synthetic aperture flow
imaging using a dual stage beamformer approach is presented.
The velocity estimation is angle independent and the amount
of calculations is reduced compared to full synthetic aperture,
but still maintains all the advantages at the same time. The
new method has been studied using the Field II simulations and
experimental flow rig measurements. A linear array transducer
with 7 MHz center frequency is used, and 64 elements are active
to transmit and receive signals. The data is processed in two
stages. The first stage has a fixed focus point. In the second
stage, focal points are considered as virtual sources and data
is beamformed along the flow direction. Then the velocities are
estimated by finding the spatial shift between two signals.
In the experimental measurements the angle between the
transmit beam and flow vessel was 70 and a laminar flow with
a parabolic profile was generated by a flow rig. The flow with
a peak velocity of 0.1 m/s was sampled at a pulse repetition
frequency of 4 kHz. The signals were transmitted and received
by the experimental scanner SARUS (Synthetic Aperture Realtime
Ultrasound System). A relative standard deviation of 2.3%
and bias of 6.4% at 65 were achieved in the simulations, and
4.3% and 4.2% for the experimental measurements. A color flow
map image was made in 48 emissions corresponding to a frame
rate of 83 frames/s.
Original language | English |
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Title of host publication | Proceedings of 2011 IEEE International Ultrasonics Symposium |
Number of pages | 4 |
Publisher | IEEE |
Publication date | 2011 |
Pages | 1254-1257 |
ISBN (Print) | 978-1-4577-1251-7 |
DOIs | |
Publication status | Published - 2011 |
Event | 2011 IEEE International Ultrasonics Symposium - Caribe Royale, Orlando, United States Duration: 18 Oct 2011 → 21 Oct 2011 http://ewh.ieee.org/conf/ius_2011/ https://ieeexplore.ieee.org/xpl/conhome/6269152/proceeding |
Conference
Conference | 2011 IEEE International Ultrasonics Symposium |
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Location | Caribe Royale |
Country/Territory | United States |
City | Orlando |
Period | 18/10/2011 → 21/10/2011 |
Internet address |