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For ultrasound blood flow detection, a method using Kalman filter in full-depth estimation, full-depth tracking and M-mode imaging is presented. The limitations of the most used periodgram technique are discussed, while the Kalman filter can handle non-Gaussian case and high order operation. Dynamic models of full-depth estimation and tracking are described, as well as the spectrum estimation one...
Most of the ultrasound elasticity imaging techniques can't improve the resolution and penetration at the same time. Coded excitation has displayed the capability to improve the penetration by transmitting coded waves and decoding the RF echoes. But the effectiveness of this technique in ultrasound elastographic imaging methods has not been fully demonstrated. This paper introduces a phase modulation...
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...
When applying the coded transmission technique into the pulsed-echo ultrasound system one of the big problems is the limited time frame for the coding sequence to be feed into the pulse-echo duration. Generally, only very short code sequence could be modulated in each transmitted pulse especially in the medical ultrasound system. Due to the poor correlation property of such kind of short code and...
When applying the spread spectrum technology into the pulse-echo ultrasound system, the code selection is critical, as the duration time of the transmission pulse is normally short. It is difficult and as the mater of fact almost impossible in a nonlinear application like in the human body to have a good correlation property using a relatively short code excitation. A truncated long code idea is introduced...
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