Complex-valued neural networks (CVNNs) have shown their excellent efficiency compared to real counter-parts in speech enhancement, image and signal processing. Researchers throughout the years made many efforts improve learning algorithms activation functions of CVNNs. Since CVNNs proven better performance handling naturally complex-valued data signals, this area study will grow expect arrival some effective improvements future. Therefore, there exists an obvious reason provide a...

This letter proposes to integrate dendritic learnable network architecture with Vision Transformer improve the accuracy of image recognition. In this study, based on theory neurons in neuroscience, we design a that is more practical for engineering classify visual features. Based this, propose learning-incorporated vision (DVT), which out-performs other state-of-the-art methods three recognition benchmarks.

For the noninvasive diagnosis of heart disease based on acoustic characteristics muscle, we have developed a new method for accurately tracking movement wall. By this method, velocity signal wall with small amplitude less than 10 /spl mu/m motion resulting from heartbeat large mm can be successfully detected sufficient reproducibility in frequency range up to several hundred Hertz continuously periods about heartbeats. In paper, is applied multiple points preset left ventricular (LV) along...

Mechanical properties of the arterial walls are significantly altered by atherosclerosis, and various studies have been recently conducted to measure regional elastic (radial strain) wall. We developed a phase-sensitive correlation-based method, namely, phased-tracking radial strain. On other hand, measurement blood flow is an important practical routine in diagnosis atherosclerosis. It would be useful if strain wall as well could assessed simultaneously. Such require high frame rate several...

Background Although a significant progress has been made in the management of ischemic heart disease (IHD), number severe IHD patients is increasing. Thus, it crucial to develop new, non-invasive therapeutic strategies. In present study, we aimed low-intensity pulsed ultrasound (LIPUS) therapy for treatment IHD. Methods and Results We first confirmed that cultured human endothelial cells, LIPUS significantly up-regulated mRNA expression vascular growth factor (VEGF) with peak at 32-cycle...

Ultrasound imaging is widely used in medical diagnosis. It has the advantages of being performed real time, cost-efficient, noninvasive, and nonionizing. The traditional delay-and-sum (DAS) beamformer low resolution contrast. Several adaptive beamformers (ABFs) have been proposed to improve them. Although they image quality, incur high computation cost because dependence on data at expense real-time performance. Deep-learning methods successful many areas. They train an ultrasound model that...

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

High-frame-rate echocardiography using unfocused transmit beams and parallel receive beamforming is a promising method for evaluation of cardiac function, such as imaging rapid propagation vibration the heart wall resulting from electrical stimulation myocardium. In this technique, high temporal resolution realized at expense spatial contrast. The phase coherence factor has been developed to improve contrast in ultrasonography. It evaluates variance phases echo signals received by individual...

Ultrasound detection is a potent tool for the clinical diagnosis of various diseases due to its real-time, convenient, and noninvasive qualities. Yet, existing ultrasound beamforming related methods face big challenge improve both quality speed imaging required applications. The most notable characteristic signal data spatial temporal features. Because signals are complex-valued, directly processing them by using real-valued networks leads phase distortion inaccurate output. In this study,...

Abstract Singular value decomposition (SVD)-based clutter filters effectively separate tissue, blood flow, and noise components. This study compares post-beamformed (conventional) pre-beamformed (proposed) data with SVD-based to enhance the flow echo. Using simulation, experimental, in vivo data, image contrast was evaluated against different locations near- far-tissues, itself. The suppression of tissue component more improved proposed method while conventional achieved comparable or higher...

Abstract In the image reconstruction of ultrasound B-mode images, an average speed sound (SoS) in living tissue is assumed to be a constant value. However, value may different with true values because SoS varies depending on properties tissue. The error between and SoSs causes degradation images. We have proposed method for estimating distribution. this study, we conducted numerical simulation evaluated effects motion estimation method. Furthermore, phantom experiments. both experiment, when...

Abstract Carotid artery stenosis is a major risk factor for cerebrovascular disease, requiring accurate and early diagnosis. In this study, we propose an improved stenotic blood vessel model that accounts in vivo vascular geometry. Using two transmit center frequencies, evaluated accuracy estimation of flow velocity vectors with multi-angle Doppler method implemented via plane wave imaging (PWI) multi-line transmission (MLTI). Among the tested conditions, MLTI at 6.94 MHz achieved lowest...

In this study, we designed an ultrasound transmit–receive sequence to achieve high-frame-rate vascular wall velocity estimation and high-contrast B-mode imaging. The proposed extends conventional dual-transmission schemes by incorporating a third transmission with 180° phase inversion, enabling harmonic imaging via the pulse inversion (PI) method. To mitigate frame rate reduction caused additional transmission, number of simultaneously transmitted focused beams was increased from two four,...

High-dispersion of a hydrophobic TEMPO derivative inside the pores activated carbon provides high-performance aqueous electrochemical capacitor electrodes without polymerization.

An asymmetric polymer capacitor was prepared from pyrene (PY), aniline (ANI), and commercially available activated carbon (AC) through a solvent-free preparation. PY ANI were adsorbed into the AC host material in gas phase electrochemically polymerized exclusively inside pores an aqueous H2SO4 electrolyte (1 M). No volumetric expansion of particles occurred upon adsorption monomers their subsequent polymerizations; thus, capacitance enhanced by inclusion pseudocapacitive polypyrene (PPY)...

A metal-free redox organic compound, 2,5-dichloro-1,4-benzoquinone (DCBQ), was finely dispersed over the porous carbon substrate, Ketjen Black (KB), by a solvent-free method in only one step. By using this method, DCBQ loaded inside pores of KB with as much ca. 60 wt % sample without any agglomeration. This high loading along dispersion can be attained due to absence solvent. Since procedure is free from solvents it also solvent removal, at which compounds tend agglomerate concentration...

Atherosclerotic change of the arterial wall leads to a significant in its elasticity. For assessment elasticity, measurement deformation is required. motion estimation, correlation techniques are widely used, and we have developed phase-sensitive method, namely, phased-tracking measure regional strain due heartbeat. Although methods using demodulated complex signals require less computation comparison with between RF or iterative methods, displacement estimated by such biased when center...

Visualization of blood flow is important to evaluate the cardiac function. In this study, we propose two signal processing techniques based on singular value decomposition (SVD) for visualization flow: one a filtering clutter reduction and other regularization method color Doppler images. filtering, contrast-to-noise ratio obtained by SVD was better (15.7 dB) than that conventional finite impulse response (−0.5 dB). imaging, standard deviation decreased from 0.022 0.014 mm s−1 proposed method.

The endothelial dysfunction is considered to be an initial step of atherosclerosis. Additionally, it was reported that the smooth muscle, which constructs media artery, changes its characteristics owing Therefore, essential develop a method for assessing regional function and mechanical property arterial wall. There conventional technique measuring transient change in diameter brachial artery caused by flow-mediated dilation (FMD) after release avascularization. For more sensitive...