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Background Ultrasound transient elastography technology has found its place in elastography because it is safe and easy to operate. However, it’s application in deep tissue is limited. The aim of this study is to design an ultrasound transient elastography system with coded excitation to obtain greater detection depth. Methods The ultrasound transient elastography system requires tissue vibration...
When applying the space-time coding technique into the ultrasound imaging system, the signal-to-noise-ratio (SNR) can be improved. However when the space-time coding combines with the conventional synthetic aperture techniques can result some ghost images because the conventional synthetic aperture technique cannot suppress the axial direction of the side-lobe which emerges after pulse compression...
This work focuses on the internal mechanism of adding window technology and its application in the truncated long code ultrasound system. First, a simple introduction of the truncated long code is given in which the transmitted pulses are coded using different short codes from burst to burst, and all the echoes are organized together coherently in the later estimation process to form a long code modulation...
Orthogonal frequency ultrasound vibration (OFUV) pulses are developed to generate ultrasound radiation force for stimulating vibrations in a tissue region with preferred spectral distribution. So we can increase specific vibration harmonics in which the tissue mechanical response is concentrated. In order to achieve a better detection result, spectrum of vibration pulses, mechanical response and bandwidth...
Predistortion technology is an adaptive, low cost and potential linearization method. Proper loop-delay estimation and compensation are important preconditions for ensuring the predistorter working well. But traditional loop-delay estimation algorithms are vulnerable to the amplifier's memory and nonlinear distortion. In this paper, based on the relationship between the system loop-delay and the amplitude...
Garey and Johxon have proved that the problem to determine the crossing number of graphs is NP-complete. Because of its difficulty, presently we only know the crossing number of some classes of special graphs. The crossing number of cartesian products of paths and cycles with 5-vertex graphs mostly are known, but only few cartesian products of 5-vertex graphs with star K1,n are known. In this paper,...
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