Modified high-resolution wavenumber analysis for detection of pulse wave velocity using coefficient of variation of arterial wall acceleration waveforms

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In the early stage of atherosclerosis, the luminal surface of the arterial wall becomes rough. Methods for distinguishing between the reflected and backscattered components in the ultrasonic echo from the arterial wall has the potential to be used as a method for assessment of the roughness of the arterial wall. In this study, we proposed a method to distinguish between the reflected and backscattered components using a technique based on plane wave compounding. This method was evaluated by experiments using planar phantoms with rough surfaces made of polyurethane rubber. The coefficient of variation calculated from the mean value of the reflection component and the standard deviation of the backscattering component was proportional to the roughness of the rubber phantom. This result shows the potential usefulness of this method for analyzing surface roughness of the arterial wall.

Section: Introductionmentioning

confidence: 99%

Enhancement of reflection and backscattering components by plane wave imaging for estimation of surface roughness

Tochigi

Nagaoka

Wilhjelm

et al. 2022

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“…[2][3][4][5] One of the methods for diagnosis of atherosclerosis is pulse wave velocity (PWV). [6][7][8][9][10][11] In atherosclerosis, the arterial wall becomes stiff with the disease progression. The PWV provides a valuable marker for noninvasive evaluation of arterial stiffness.…”

Section: Introductionmentioning

confidence: 99%

Study on estimation of surface roughness by separation of reflection and backscattering components using ultrasonic synthetic aperture imaging

Nagata

Nagaoka

Wilhjelm³

et al. 2021

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The luminal surface of the arterial wall roughens in the early-stage atherosclerosis. A possible differentiation between the reflected and scattered components in the ultrasonic echo from the arterial wall potentially can serve as a diagnostic tool when such roughening occurs. This study presents a method for the differentiation of reflection and scattering components by creating ultrasonic beams from different directions using the synthetic aperture method. The technique was evaluated in experiments on urethane rubber phantoms. The average magnitude of the echo signals from each phantom and the ratio of the mean values of the reflection and scattering components were found to be proportional to the arithmetic average roughness evaluated with a laser surface profilometer. These results show that the proposed separation technique has potentials in evaluation of surface roughness.

“…To evaluate more regional PWV, the frame rate in ultrasound imaging was increased by reducing the density of scan lines, 6) using ECG gating, 7) and introducing highframe-rate imaging with plane wave transmission. [8][9][10][11] As a result, the propagation of PWV in a short segment of approximately 10 mm can be evaluated.…”

mentioning

confidence: 99%

Evaluation of accuracy of phase-sensitive method in estimation of axial motion and deformation with fluid-structure interaction analysis

Ishikawa¹,

Mozumi²,

Omura³

et al. 2021

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Accuracies of ultrasonic methods for estimation of motion/deformation should be evaluated, but such evaluation in real experiments is not easy because it is difficult to know the true distribution of motion/deformation in complex geometry, such as an atherosclerotic plaque model. In the present study, numerical simulation was performed to obtain ultrasonic echo signals from a deforming plaque model. The accuracies of our phase-sensitive 2D motion estimator in estimation of velocity and strain rate were evaluated to be 22.8% and 27.6%, respectively, and the spatial features of the estimated velocity and strain rate distributions were well corresponded to the true distributions.