Improvement of myocardial displacement estimation using subkernels for cross correlation between ultrasonic RF echoes

Abstract

Two modified Dorogovtsev-Mendes (DM) models of aging networks based on the dynamics of connecting nearest-neighbors are introduced. One edge of the new site is connected to the old site with probability ∼ kt −α as in the DM's model, where the degree and age of the old site are k and t, respectively. We consider two cases, i.e. the other edges of the new site attaching to the nearest-neighbors of the old site with uniform and degree connectivity probability, respectively. The network structure changes with an increase of aging exponent α. It is found that the networks can produce scale-free degree distributions with small-world properties. And the different connectivity probabilities lead to the different properties of the networks.

Acoustic emission signal source localization on plywood surface with cross-correlation method

“…Based on the cross-correlation principle, the time differences or delay measurements can be carried out between the chopping and the continuous wave, which is expressed as the degree of correlation among the two time series, that is, described the degree of correlation between the random signals x(t) and y(t) at two different moments both t 1 and t 2 [20,21]. Thus, assuming that there is a defect at the point A, and the sensors 1 and 2 are installed at fixed points B and C, respectively, to accurately locate them (Fig.…”

Near Real-time Measurement of Myocardial Contraction and Relaxation Based on High-frame-rate Ultrasound with a Graphical Processing Unit System

“…The correlation kernel should be designed based on the ultrasound speckle size that depends on the ultrasound beam width and pulse length (30) (31) . In the present study, the correlation kernel were defined using the − 20 dB width of the lateral ultrasound beam, B L , and that of the envelope in the axial direction, B D .…”

Introduction of measurement techniques in ultrasonic electronics: Basic principles and recent trends

“…Scattering [359][360][361][362][363][364] Ultrasonic transducers (piezoelectric effect) and its attachments [375][376][377][378][379][380][381] Acoustic field measurement and control [382][383][384][385][386] Blood flow measurement [394][395][396][397] Tissue characterization Velocity [125][126][127][128][129][130][131][132][133][134][406][407][408]420,422) Displacement 409,413,425) Thickness 399,418) Viscoelasticity 398,[401][402][403][404][405][410]…”