Project: Research project

Project Details


The progress of the previous four years of this program has been
substantial. New beams have been discovered and evaluated, new
ceramics have been evaluated, novel arrays have been built and
studied, and new methods of aberration correction and flow estimation
have been demonstrated. Our goal continues to be to develop new
beams for improving the quality of medical ultrasound imaging. In
this phase of the research we will develop new approaches to velocity
estimation based on signal processing techniques developed in the
sonar and radar literature collectively called direction-of-arrival (DOA)
methods. Our general hypothesis is: Special transducer geometries
(for transmit) combined with special beamforming in receive, derived
from DOA concepts, will produce quality improvements in blood and
tissue velocity imaging. The hypothesis will be tested through four
Aims: 1) High-resolution velocity discrimination. Very high velocity
resolution methods are developed from dOA theory; 2) Novel clutter
rejection approaches which also ensue from DOA theory; 3) True-
velocity flow mapping. Doppler flow-mapping process is described as
a convolution of the true velocity map and a generalized ambiguity
function; and 4) Quantitative schlieren beam imaging. The Doppler
beams will be characterized using a specially modified schlieren
system. Successful completion of this collaboration between imaging
scientists at Mayo and signal processing experts at the University of
Minnesota will result in improved medical ultrasound imaging of tissue
and blood motion.
StatusNot started


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