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

Abstract

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.

Preliminary study on modeling blood flow velocity profile for ultrasonic measurement of wall shear stress

“…Vascular functional imaging, such as pulse wave imaging [1][2][3][4][5] and strain imaging [6][7][8][9][10][11] for estimation of viscoelasticity, [12][13][14][15] has potential for quantitative diagnosis of atherosclerosis at an early stage. The wall shear stress (WSS) is the shear stress exerted on the arterial wall luminal surface due to blood flowing in the lumen 16,17) and has attracted attention for the diagnosis of vascular diseases.…”

Determination of thermal and mechanical indices of an ultrasound probe with an inclined beam-axis in accordance with the new JIS (or IEC Standards)

“…Research on ultrasonic diagnosis [1][2][3][4][5][6][7][8][9][10][11][12][13] and ultrasonic therapy 14,15) are important in developing safe and highperformance medical ultrasonic equipment. As for ultrasonic diagnostic equipment, precise and practical test methods for the determination of thermal and mechanical indices related to medical diagnostic ultrasonic fields are required to ensure the safety of patients in diagnosis.…”

Characterization of blood mimicking fluid with ultrafast ultrasonic and optical image velocimeters

“…[3][4][5] Ultrafast ultrasound imaging has been applied to characterization of vascular systems such as the pulse wave velocity, [6][7][8] wall shear stress, [9][10][11] and strain. [12][13][14] Our previous study also evaluated blood flow dynamics in the numerical simulation and in vivo measurement using a block matching method under plane wave transmission at a single angle 15,16) and autocorrelation algorithm with the repeated transmission sequence for multi-angle plane wave imaging. 17,18) In the present study, an in vitro measurement system was developed for ultrafast ultrasound imaging to evaluate the appropriate flow conditions by synchronizing another velocimetry such as high-speed camera applications with laser illumination, i.e.…”