Simultaneous Coherent and Displacement Compounding for 2D Noninvasive Carotid Strain Imaging: a Proof of Principle Study
arxiv(2024)
摘要
Arteriosclerosis results from lipid buildup in artery walls, leading to
plaque formation, and is a leading cause of death. Plaque rupture can cause
blood clots that might lead to a stroke. Distinguishing plaque types is a
challenge, but ultrasound elastography can help by assessing plaque composition
based on strain values. Since the artery has a circular structure, an accurate
axial and lateral displacement strategy is needed to derive the radial and
circumferential strains. A high precision lateral displacement is challenging
due to the lack of phase information in the lateral direction of the beamformed
RF data. Previously, our group has developed a compounding technique in which
the lateral displacement is estimated using tri-angulation of the axial
displacement estimated from transmitting and beamforming ultrasound beams at
+-20 degree. However, its applicability to in vivo is challenging due to the
imaging noise and the low contrast of the arterial wall, caused by a single
plane wave transmission. In this paper, we combine our displacement compounding
with coherent compounding. Instead of transmitting a single plane wave,
multiple plane waves are transmitted at certain angles with respect to the
angle of the beamforming grids, and then the backscattered wavefronts are
beamformed and coherently compounded on the center of the transmit beams (-20,
+20 and 0 degree). ...
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