Certain pathological conditions, such as malignant tumours, manifest themselves as changes in the tissue's mechanical stiffness. This is the basis for palpation. Several techniques for imaging tissue elasticity using ultrasound have been proposed: compression elastography (strain imaging), transient elastography and vibration sonoelastography. The latter involves imaging of vibration patterns r...

Many effluent treatment processes result in a concentrated brine solution that requires disposal. Bulk crystallisation of the salt can facilitate this disposal, by providing a solid that can be more readily transported. In this presentation, we consider the use of ultrasound to assist in initiating the crystallisation of salt from saline effluent sourced from the Australian dairy industry. The ...

The design of a universal waveform generator derived from displaying driving applications using floating power and Miller integrator circuit is introduced first. Then, the feasibility of driving ultrasound transducers is verified by the test of the circuit and compared with other specific design of pulse generator for ultrasound driving purpose.

Advanced ultrasound technology has been a valuable tool in the assessment of placental anatomy and physiology. Con­ ventional two­dimensional (2D) sonography reveals placental morphological characteristics, 2D color Doppler can assess blood flow in the placenta, 2D power Doppler can evaluate placental vascular trees, and three­dimensional (3D) ultra­ sound gives more detailed information on the...

Microwave-assisted and ultrasound-assisted extraction assays were used to isolate total flavonoids (TF) from Osmanthus fragrans flowers. The effects of the solid-liquid ratio, ethanol concentration, microwave power, microwave extraction time, ultrasonic power and ultrasonic extraction time on the yield of TF were studied. A sequential combination of microwave- and ultrasound-assisted extraction...

The Doppler effect, which occurs on the reflection of ultrasound from moving blood or tissue, is observed as a shift in frequency of the reflected ultrasound from that of the incident ultrasound. This Doppler shift has been widely used in clinical practice as a means of measuring blood velocity. Two types of Doppler Imaging are often discussed as facilities on ultrasonic scanners, namely Colour...

Silver particles less than 20 nm in diameter were synthesized by pyrolysis of an ultrasonically atomized spray of highly dilute aqueous silver nitrate solution at temperatures above 650◦C and below the melting point of silver. Feed solution concentration and ultrasound power applied to the atomizer were found to have a significant impact on the particle size of the silver nanoparticles. Average...

PURPOSE The purpose of this study was to monitor tumour blood flow with power Doppler ultrasound following antiangiogenic therapy with bevacizumab in order to optimally time the application of radiofrequency (RF) ablation to increase ablation diameter. MATERIALS AND METHODS Athymic nude mice bearing human hepatocellular carcinoma xenografts were treated with bevacizumab and imaged daily with ...

Radiation force balance (RFB) measurements of time-averaged, spatially-integrated ultrasound power transmitted into a reflectionless water load are based on measurements of the power received by the RFB target. When conical targets are used to intercept the output of collimated, circularly symmetric ultrasound sources operating at frequencies above a few megahertz, the correction for in-situ at...

We model the radio-frequency (RF) ultrasound echo by a shot noise process with narrow-band power-law lter function. As a consequence, the in-phase and quadrature components of the return signal are shown to exhibit 1=f type spectral behavior. The envelope also exhibits this type of spectral behavior but with a diierent exponent. The model parameters, namely the rate of the point process and the...