Evaluation of Rate of Change in Thickness of Heart Wall by Measuring Time Variation of Ultrasonic Integrated Backscatter during a Cardiac Cycle

Measurementthe act of measuring physical properties that we performhas the potential to contribute to the successful advancement of sciences and society. To open doors in physics and other sciences, various measurement methods and related applications have been developed, and ultrasound has remained a useful probe, power source, and interesting measurement object for the past two centuries. In this paper, we first summarize the basic principles of ultrasound from the viewpoint of measurement techniques for readers who just have started studying or are interested in the field of ultrasonic electronics. Moreover, we also introduce recent studiesultrasonic properties of materials, measurement techniques, piezoelectric devices, nonlinear acoustics, biomedical ultrasound, and ocean acousticsand their trends related to measurement techniques in ultrasonic electronics to provide some ideas for related applications.

Section: Biomedical Ultrasoundmentioning

confidence: 99%

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

Mizutani¹,

Wakatsuki²,

Ebihara³

2016

“…Recently, it has been shown that the ultrasonic measurement of myocardial contraction and its propagation is useful for the evaluation of the myocardial function. [1][2][3] On the other hand, the evaluation of blood flow structures in echocardiography is also useful for the diagnosis of the pumping function of the human heart. 4,5) As a typical method, color Doppler flow imaging (CDI) has been widely used to obtain information on intracardiac blood flow in clinical practice.…”

Section: Introductionmentioning

confidence: 99%

Echo speckle imaging of blood particles with high-frame-rate echocardiography

Takahashi

Hasegawa

Kanai

2014

Cardiac blood flow patterns such as the vortex flow pattern inside the left ventricle have been studied to provide new information for the diagnosis of the pumping function of the human heart. Complex blood flow is visualized by imaging echo speckles of blood particles because the speckle-like texture translates to the motion of blood particles. We proposed an imaging method for echo speckles of blood particles using high-frame-rate ultrasound for the visualization of the intracardiac blood flow direction. High-frame-rate ultrasound is useful for continuously observing the fast motion of echoes from blood particles in the heart. In the present study, weighting by coherence and compounding the magnitudes of echo signals in different transmissions were introduced to visualize weak echoes from blood particles. The feasibility of the visualization of cardiac blood flow using high-frame-rate ultrasound was demonstrated by basic and in vivo experiments.

“…[11][12][13][14][15][16] Although the morphological information obtained using ultrasonic diagnostic equipment is useful, functional imaging of tissues would provide beneficial diagnostic information. [17][18][19][20][21][22][23] Particularly in echocardiography, myocardial strain and strain rate have also been shown to be effective in the diagnosis of myocardial function. 22,[24][25][26][27] For the assessment of myocardial motion and deformation, the speckle tracking method, [28][29][30][31] which estimates motion using backscattered ultrasonic echoes by regional patternmatching techniques, 32) is widely used.…”

Section: Introductionmentioning

confidence: 99%

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

Asari

Hasegawa

Kanai

2014

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.