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A device for the detection of polymers is under the development. The use of ultrasonic waves for understanding the aquatic environment is undertaken in this work. The material presented explains how the waves behave for different samples (size, shape, composition) of polymers and the observation is the signature of the species under study.
In view of the docking problem of indoor Intelligent Wheelchair/Bed (IWB), a docking control method based on the combination of a simple artificial landmark and ultrasound is proposed in this paper. First, the artificial landmark on the auxiliary bed is identified and the artificial landmark is used to establish the world coordinate system; then, the relative position and orientation from the wheelchair...
This paper investigates the consistency in phased array element performance by extracting information from the Full Matrix Capture (FMC) of a reflection from a planar interface. The purpose of this work is to generate a robust methodology for tracking phased array performance over time, therefore, ensuring the reliability of measured data. To achieve this, a calibration method has been developed that...
This paper presents an obstacle detection system able to permit the visually impaired user to get information on the surrounding complex environment. The system also allows setting an active mobile connection with the distant assistant guide. A low-cost ultrasound microcontroller based system, capable of detecting grounded or raised obstacles up to a few meters in front of the subject, is proposed...
The characterization of transducers ultimately play an important role in determining the quality of the image. Electrical impedance, pulse-length, bandwidth, and sensitivities are parameters commonly used to characterize the transducer. An achievement of this paper is that these parameters of two single transducers one element have been characterized by combining the measurement results in pulse-echo...
In total hip arthroplasty, a placement of stem, which is one of the parts of the artificial hip joint, is even difficult for skilled operators. An optimum location of stem is different for each patient. No system for specifying the optimum location has been established. We pay attention to the method using ultrasound in consideration of portability and high introduction ratio to the medical field...
Knowing the wind speed is an important factor that includes several scientific areas. For the types of existing anemometers, the ultrasonic model is what can be used in most applications. As part of the necessary calculus for wind speed acquisition, it is needed to find the correct ultrasonic echo emitted that has been corrupted by the environmental conditions imposed on it, and is the bigger challenge...
The influence of ultrasonic radiation in the cavitation regime on the properties of wood activated carbon has been studied. The impedance dependence for the supercapacitors made both of the original and the modified carbon have been analysed. The equivalent electrical circuits modelling the impedance hodographs have been constructed. It has been shown that ultrasonic radiation changes the properties...
Long term reliability has been a challenging issue in CMUT probe development. Kolo Medical Inc. has worked on improving reliability of CMUT probes for many years. Testing methods were developed and utilized to assess long term reliability and evaluate CMUT design improvements. A large amount of long term reliability test data were collected and analyzed.
The aim of this study is to investigate how the intracellular ROS responds to different degrees of sonoporation. Using a customized platform for 1.5-MHz ultrasound exposure (13.33-μs duration and 0.70-MPa peak negative pressure) and observing the dynamics of sonoporation and intracellular ROS at the single-cell level, we quantified the exogenous molecular uptake and intracellular ROS indicator to...
It was estimated that annual cost of measurable medical errors was higher than $17 billion in 2008. Phantoms are objects manufactured using a tissue mimicking material (TMM) and largely used to test protocols and mimic clinical environment for medical training. TMM should reproduce at least one biological property to allow the association with clinical situation. The gel made by the copolymer styrene-ethylene/butylene-styrene...
For drug-resistant epilepsy patients, epilepsy surgery is the only option. In clinic, this is done with subdural electrode array with a disappointing low spatial resolution of ∼ 1cm. In order to improve clinical cure rate, ultrasound imaging technique can be cooperated with Electrocorticography to monitor the maps of seizure. We propose to develop the implanted single ultrasound transducers 3mm×1...
An effective imaging modality to delineate ablated regions after microwave ablation (MWA) therapy is crucial to yield successful treatment outcomes. Ultrasound B-mode imaging is widely used to guide the ablation antenna placement. However, the image quality suffers from relatively low imaging contrast due to the similar echogenicity between the ablated and surrounding tissue. In this study, we applied...
As one of the most important and well established tools, ultrasound imaging provides noninvasive valuable diagnostic information, especially in the form of cross-sectional images of soft tissues. In this work, we report the design, fabrication, and characterization of press-focused LiNbO3 transducer with one matching layer only. The performance of these transducers is in good agreement with the simulation...
Photoacoustic imaging is a hybrid imaging modality where ultrasound signal is generated when laser pulses are absorbed by tissue. Tissue-mimicking phantom is a useful tool to characterizing new imaging methods. However, there is still a lack of development of phantoms applied to hybrid modalities such as photoacoustics. SEBS gel is a translucent material and present acoustic and elastic properties...
A novel ultrasound (US) platform with high channels density is a pre-requisite to open new frontiers in diagnostic and/or therapy by experimental implementation of new enabled advanced techniques. To date, few systems in the world permit to have a full and simultaneous control both in transmit and receive of all single elements of arrays with more than 1000 transducers. This paper presents a powerful...
Microbubble based contrast-enhanced ultrasound (CEUS) enables the visualization of vascularity given the tendency of microbubbles to function as a blood pooling agent. Using contrast specific ultrasound (US) imaging, it is possible to quantify the kinetics of these agents and derive various perfusion metrics. In this ongoing clinical study, we evaluate the feasibility of using these microbubble based...
Cervical spine pathoanatomy is typically evaluated by static radiographs, CT or MRI; however, these modalities are unable to directly measure the dynamic performance of the spine that account for its functionality. We have developed an ultrasound based technique that provides a non-invasive, realtime, quantitative, textitin-vivo image of the C-spine that allows for assessment of the dynamic motion...
Infrastructures such as bridges, railways and roads are vital to every country's economic growth and development. These are usually reinforced concrete structures which need regular monitoring for operation and safety. The large concrete structures pose many challenges for inspection due to surface roughness, inhomogeneities and size of aggregates. Nondestructive testing is one of the most effective...
Off-axis clutter is a significant cause of image degradation in ultrasound. We propose an adaptive approach for clutter reduction based on the principle that off-axis signals show as relatively high spatial frequencies in the per-channel data. For each pixel, an M∗N per-channel data matrix is extracte from the aligned data received from different observations of that pixel (N = number of channels,...
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