Effective speckle reduction in ultrasound B-mode imaging is important for enhancing the image quality and improving accuracy analysis interpretation. In this paper, a new feature-enhanced (FESR) method based on multiscale feature enhancement filtering proposed imaging. FESR, clinical features (e.g., boundaries borders of lesions) are selectively emphasized by edge, coherence, contrast from fine to coarse scales while simultaneously suppressing development via robust diffusion filtering....

Ultrafast power Doppler imaging based on coherent compounding (UPDI-CC) has become a promising technique for microvascular due to its high sensitivity slow blood flows. However, since this method utilizes limited number of plane-wave or diverging-wave transmissions high-frame-rate imaging, it suffers from degraded image quality because the low contrast resolution. In article, an ultrafast nonlinear framework, called frame-multiply-and-sum (UPDI-FMAS), is proposed improve UPDI-FMAS, unlike...

Noninvasive monitoring of blood flow in the carotid artery is important for evaluating not only cerebrovascular but also cardiovascular diseases. In this paper, a wireless neckband ultrasound Doppler system, which two 2.5-MHz ultrasonic sensors are utilized acquiring signals from both arteries, presented continuously dynamics. developed acquired quantized by 14-bit analog-to-digital-converters running at 40 MHz, and pre-processing operations (i.e., demodulation clutter filtering) performed...

Ultrafast ultrasound imaging provides great opportunities for very high frame rate applications, such as shear wave elastography and microvascular imaging. However, ultrafast with curved array transducers remains challenging in terms of element directivity a limited field-of-view (FOV) fully synthetic area. In this paper, wide FOV method based on diverging transmissions is presented abdominal applications. For method, theoretical model solution virtual point source originating from circular...

Inspecting the sealing integrity of lead tabs is an important means ensuring reliability and safety pouch-type lithium-ion (Li-ion) batteries with a thin multi-layered aluminum (Al) laminated film. This paper presents new air-coupled ultrasonic non-destructive testing (NDT) inspection method based on leaky Lamb wave transmission; reception for evaluating between tab Al pouch The proposed uses critical incidence angle air layer fastest velocity to maximize signal-to-noise ratio in...

Chirp-coded excitation can increase the signal-to-noise ratio (SNR) without degrading axial resolution. Effective pulse compression (PC) is important to maintain resolution and be achieved with radio frequency (RF) complex baseband (CBB) data (i.e., , respectively). further reduce computational complexity compared ; however, suffers from a degraded SNR due tissue attenuation. In this paper, we propose new dynamic CBB PC method ( that improve while compensating for The filter coefficients in...

Detecting microcalcifications (MCs) in real time is important the guidance of many breast biopsies. Due to its capability visualizing biopsy needles without radiation hazards, ultrasound imaging preferred over X-ray mammography, but it suffers from low sensitivity detecting MCs. Here, we present a new nonionizing method based on real-time multifocus twinkling artifact (MF-TA) for reliably Our approach exploits time-varying TAs arising acoustic random scattering MCs with rough or irregular...

Ultrafast compound Doppler imaging based on plane-wave excitation (UCDI) can be used to evaluate cardiovascular diseases using high frame rates. In particular, it provides a fully quantifiable flow analysis over large region of interest with spatio-temporal resolution. However, the pulse-repetition frequency (PRF) in UCDI method is limited for high-velocity since has tradeoff between number angles (N) and acquisition time. this paper, we present PRF ultrafast sliding (HUSDI) improve...

Implementation of a high-frequency ultrasound (HFUS) beamformer is computationally challenging because its high sampling rate. This article introduces an efficient with sub-Nyquist (or bandpass sampling) that suitable for HFUS imaging. Our approach used channel radio frequency data sampled at rate (i.e., 4/ 3fc ) and postfiltering-based interpolation to reduce the computational complexity. A polyphase structure was further burden while maintaining adequate delay resolution ( δ ). The...

Although functional magnetic resonance imaging (fMRI) and scalp electroencephalography (EEG) are powerful tools to study the human brain behavior for many clinical research applications, they limited in both resolution accuracy. Transcranial Acoustoelectric Brain Imaging (tABI) is a new modality that combines focused ultrasound with electrical sensing map currents at millimeter millisecond scales. The aims of this demonstrate feasibility assess performance integrating tABI neuronavigation...

For medical ultrasound imaging, the dynamic receive beamforming is important for improving image quality, i.e., spatial and contrast resolution. In current beamforming, a constant sound speed (e.g., 1540m/s) assumed. However, dispersed in soft tissues leads to defocusing degradation of quality. Various methods have been proposed estimate proper with received data, but these not verified their performance clinical cases breast tissue). this paper, five different estimation (i.e., coherent...

The recently introduced plane-wave compounding method based on multiple excitation has enabled several new applications due to its high frame rate (>1000 Hz). In this paper, a efficient transmit delay calculation in compound imaging for curved array transducer is presented. the proposed method, only calculated steering angle of 0° and shifted along element obtain other delays different angles. To evaluate performance computational complexity was measured various transmission conditions....

Purpose Mammography is the only method that has been proven to detect breast microcalcifications (MCs), but sensitivity of mammography varies according density. This paper proposes an ultrasound (US) color Doppler twinkling artifact (CDTA) with optimized transmit conditions identify MCs without ionizing radiation. Methods The for US imaging (CDI) were enhance (TA) arises from random scattering on rough surfaces MCs. To validate proposed MC detection method, a chicken phantom particles...

For multi-planar reconstruction in 3D ultrasound imaging, direct and separable scan conversion (SC) have been used for transforming the data acquired polar coordinate system to Cartesian system. These SC methods can visualize an arbitrary plane volume data. However, they suffer from blurring blocking artifacts due resampling during SC. In this paper, a new method based on voxel beamforming (VBF) is proposed reducing artifacts. VBF, unlike SC, each imaging directly reconstructed by applying...

Effective speckle reduction in ultrasound B-mode imaging is important for improving image quality and the accuracy analysis. While multiscale analysis-based methods such as Laplacian pyramid nonlinear diffusion (LPND) wavelet (NMWD) showed enhanced reduction, they suffer from excessive blurring artificial appearance. In this paper, a new feature-enhanced (FESR) method based on analysis feature enhancement filtering presented imaging. To separate true clinical features (e.g., boundaries of...

Speckle, shown as a granular pattern, considerably degrades the image quality of ultrasound B-mode imaging and lowers performance segmentation registration techniques. Thus, speckle reduction while preserving tissue structure (e.g., edges boundaries lesions) is important for imaging. In this paper, new approach edge enhancement based on laplacian pyramid nonlinear diffusion homomorphic filtering (LPNDHF) proposed LPNDHF, with weighting factor applied in multi-scale domain (i.e., pyramid)...

In ultrasound B-mode imaging, dynamic range (DR) is typically given with a fixed value, and operators should manually adjust it. However, in 3D it difficult to DR during data acquisition, leading low image quality. this paper, the automatic adjustment (ADRA) method was applied optimize value imaging. ADRA, log average of reference computed distance ratio from its each extreme obtained. The used for adjusting an input have similar contrast. When ADRA first frame can be as so that consecutive...

Aortic pulse wave velocity (PWV) enables the direct assessment of aortic stiffness, which is an independent risk factor cardiovascular (CV) events. The aim this study to evaluate association between PWV and CV model classified into three groups based on Framingham score (FRS), i.e., low-risk (<10%), intermediate-risk (10~20%) high-risk (>20%).To noninvasively estimate local in abdominal aorta, a high-spatiotemporal resolution measurement method (>1 kHz) wide field-of-view ultrafast curved...

Multifocal Doppler twinkling artifact (MDTA) imaging has shown high detection rates of microcalcifications in phantom studies. We aimed to evaluate its performance detecting suspicious comparison with mammography by using ex vivo breast cancer specimens. prospectively included ten women that presented calcifications on mammography. Both digital specimen and MDTA were performed for specimens the day surgery. Five radiologists marked cells (referred as 'positive cell') mammographic images a...

Acoustoelectric (AE) imaging can potentially image biological currents at high spatial (~mm) and temporal (~ms) resolution. However, it does not directly map the current field distribution due to signal modulation by acoustic electric lead fields. Here we present a new method for source density (CSD) imaging. The fundamental AE equation is inverted using truncated singular value decomposition (TSVD) combined with Tikhonov regularization, where optimal regularization parameter found based on...

Dynamic range (DR) is one of the most essential parameters that determine image quality and feature representation in ultrasound B-mode imaging. Thus, automatic DR adjustment (ADRA) method was previously proposed for reducing user dependency improving quality. In this paper, a smart phone based point-of-care imaging system, real-time realization ADRA on using mobile GPU presented. The implemented NEXUS 4 running Android 4.3 by utilizing several graphics pipelines supported from OpenGL ES...