High-frequency needle ultrasound transducers with an aperture size of 0.4 mm were fabricated using lead magnesium niobate-lead titanate (PMN-33% PT) as the active piezoelectric material. The element was bonded to a conductive silver particle matching layer and epoxy backing through direct contact curing. An outer parylene formed by vapor deposition. housed within polyimide tube 20-gauge housing. magnitude phase electrical impedance transducer 47 omega -38 degrees, respectively. measured...

Mechanical energy appears everywhere in the nature, road vibration created by vehicle will not only do damage to pavement structure, but also is difficult collect. Utilizing electromechanical conversion characteristics of piezoelectric material, gather when passing on pavement, and design transducer package box, for traffic lights along roads, signs, so on. Save cost laying long distance transmission line, take full advantage loss energy. Experiments boxes has been conducted prove...

A real-time digital beamformer for high-frequency ( >20 MHz) linear ultrasonic arrays has been developed. The system can handle up to 64-element array transducers and excite 16 channels receive simultaneously at 100 MHz sampling frequency with 8-bit precision. Radio (RF) signals are digitized, delayed, summed through a beamformer, which is implanted using field programmable gate (FPGA). Using fractional delay filters, fine delays as small 2 ns be implemented. frame rate of 30 frames per...

We recently elevated interior tomography from its origin in computed (CT) to a general tomographic principle, and proved validity for other modalities including SPECT, MRI, others. Here we propose "omni-tomography", novel concept the grand fusion of multiple simultaneous data acquisition region interest (ROI). Omni-tomography can be instrumental when physiological processes under investigation are multi-dimensional, multi-scale, multi-temporal multi-parametric. Both preclinical clinical...

Detecting and distinguishing between ovarian endometriotic cysts cystadenomas using computed tomography (CT) scans is a clinical challenge due to their similar CT characteristics. This study aims identify key features that can effectively differentiate these two diseases develop simple practical scoring system. We conducted retrospective analysis of 202 patients who underwent pre-operative contrast-enhanced at medical centers. The subjects were divided into training cohort (n=151) validation...

High-frequency (HF) ultrasound imaging has been shown to be useful for non-invasively anatomical structures of the eye and small animals in biological pharmaceutical research, achieving superior spatial resolution. Cardiovascular research utilizing mice requires not only realtime B-scan imaging, but also Doppler evaluate both anatomy blood flow mouse heart. This paper reports development an HF duplex system capable B-mode measurements, using a 64-element linear array. The included...

Much of the current knowledge human cardiovascular pathologies and treatment strategies has been gained from understanding cardiac physiologies functions in small animal models, such as mice, rats, zebrafish. In this paper, we present development a high-frame-rate duplex ultrasound biomicroscopy (UBM) capable B-mode imaging pulsed-wave (PW) Doppler measurement for vivo investigation animals. A frame rate 200 frames per second (fps) was accomplished at view 5 mm x 8 mm, using novel high-speed...

This brief presents a monolithically integrated fully differential linear HV amplifier as the driver of an ultrasonic transducer. The is capable transmitting arbitrary signals with very low harmonic distortion, which suitable for tissue imaging and other modes enhanced quality. designed implemented using 0.7-μm CMOS silicon-on-insulator process 120-V devices. amplifier, when driving load 300 pF in parallel 100 Ω, sine-wave signal frequency up to 4.4 MHz, maximum swing 180 Vpp, second-order...

High performance portable ultrasound imaging system is demanded by a wide variety of point care applications. Ultrasound minimization and improvement have been proven in the past several years. One main driving forces for advanced semiconductor technology. Besides, transducer technology further enhancing sensitivity reducing cost. Corresponding silicon processes were selected achieving low power, noise compact size analog front-end (AFE) design. The combination bipolar CMOS achieves...

During the COVID-19 pandemic, an ultraportable ultrasound smart probe has proven to be one of few practical diagnostic and monitoring tools for doctors who are fully covered with personal protective equipment. The real-time, safety, ease sanitization, ultraportability features make it extremely suitable diagnosing COVID-19. In this article, we discuss implementation a designed according classic architecture scanners. design balanced both performance power consumption. This programmable...

In this paper, we report recent progress that has been made in the development of a high frame rate duplex HF ultrasound system with both B-scan imaging and Doppler flow measurements. A 32-channel analog beamformer module transmitting focusing dynamic on reception was implemented. High-speed timing circuits were used to achieve by reducing acquisition overhead. Therefore, relies only field view. The also included 64-channel front-end pulser/receiver, pulsed-wave (PW) module, PC 200MS/s...

Current tomographic imaging systems need major improvements, especially when multi-dimensional, multi-scale, multi-temporal and multi-parametric phenomena are under investigation. Both preclinical clinical now depend on in vivo tomography, often requiring separate evaluations by different modalities to define morphologic details, delineate interval changes due disease or interventions, study physiological functions that have interconnected aspects. Over the past decade, fusion of...

Reliability assessment and qualification system has strong economic implications for both manufacturers customers. The best should have a good balance among cost of verification, market timing requirement, acceptable risk that meets the targeted user's application conditions requirements. With increasing use innovative electronics in medical applications, it becomes difficult to single reliability approach serve all applications. In this paper, we review existing framework, discuss their...

Ultrasound systems require high-voltage (HV) transmitters to excite the transducers. Compared digital pulsers, class-AB power amplifiers have many advantages, such as lower harmonics and capability of generating complex arbitrary waveforms for Coded-Excitation Mode other advanced ultrasound imaging modes. However, need suppress cross-over distortion achieve high slew-rate usually requires large biasing current. This significantly degrades efficiency system, limiting number integrated...

A mathematical model to describe the thermal channel spinning (TCS) process in PET high-speed melt-spinning has been developed. This model, which is based on kinematics, includes effects of acceleration, gravity, and surfacial air friction. It incorporates constitutive equation polymer, heat transfer related transverse blowing and, particular, a convection radiation combining procedure channel, while taking into account nonisothermal crystallization kinetics temperature molecular orientation...

In this paper, we discussed the available architectures used for smart ultrasound transducer probes and implemented most popular architecture, which is very practical researchers or engineers. Field II simulation, hardware software integration, imaging acquisition were carried out. The open platform consists of 64 low-noise receiver channels, 128 transmitter FPGA, USB controller power management circuits to handle signals from uVpp 160~200 Vpp. This powered accessed via high-speed Type-C™...

Abstract In present work, the graphene with various defects have been investigated by First-principles based on DFT, and properties are compared to perfect graphene. The calculated results show that topological structure exhibits minimum defect formation energy, which will be easiest defective form. Perfect graphene, Single-vacancy Double-vacancy exhibit metallicity, but electrical conductivity of is not as good vacancy Topology semiconductor. emerging in pin C atoms along vacancy. closest...