Optimal Region-of-Interest Settings for Tissue Characterization Based on Ultrasonic Elasticity Imaging

Measurement of regional pulse wave velocity using very high frame rate ultrasound

“…In addition, methods for evaluating the elasticity and viscosity of the arterial wall have recently been developed [7][8][9][10][11][12][13]. For diagnosis of early-stage arteriosclerosis, it is useful to evaluate the elastic property of the arterial wall because arterial-wall elasticity changes with progression of arteriosclerosis [14].…”

Relationship between upper limb peripheral artery stiffness using the radial artery and atherosclerotic parameters

“…In addition to impairment of endothelial function [8], the compositional characterization (e.g., lipid, blood clot, fibrous and calcified tissue) of atherosclerotic sites is thought to be a significant aspect of evaluation of regional elasticity/stiffness and plaque rupture [9,10]. Recently, a noninvasive transcutaneous ultrasonic technology that utilizes the ''phased tracking method'' was developed in order to evaluate atherosclerotic formation based on the compositional features of the artery wall [9][10][11][12].…”

“…Recently, a noninvasive transcutaneous ultrasonic technology that utilizes the ''phased tracking method'' was developed in order to evaluate atherosclerotic formation based on the compositional features of the artery wall [9][10][11][12]. This method allows the detection of minute changes in the thickness of the layers of the arterial wall by subtracting the displacements of two points set along an ultrasonic beam during a single heartbeat.…”

Threshold Setting for Likelihood Function for Elasticity-Based Tissue Classification of Arterial Walls by Evaluating Variance in Measurement of Radial Strain

“…In our previous study, the optimum size of an ROI was determined to be 1,500 mm in the arterial radial direction and 1,500 mm in the arterial longitudinal direction. 25) In addition, in the proposed classification method, the likelihood function of each small ROI is calculated for each tissue component (lipids, blood clots, fibrous tissue, and calcified tissue), and the region is classified into the tissue component that has the maximum likelihood. 24) Every ROI is always classified into one of the four tissue components even when its maximum likelihood is very small.…”