Therefore,the AR cepstrum can be considered as an effective method for signal analysis of ultrasonic scattering and characterization of tissue scatteres.
the “WD cepstrum” is more effective to reflect the microstructure feature of tissue; the result also illustrates that “WD cepstrum” is an effective method for signal analysis of ultrasonic scattering and characterization of tissue scattered.
Average scatterer spacing is one of the important parameters in describing the biological tissue microstructure and its ultrasonic scattering characteristics.
Background and objectiveMicrobubbles(MB) ultrasound contrast agent (UCA) is clinically applied to enhance the ultrasound scattering of blood flow. It featured with noninvasive, real-time blood perfusion imaging, no side effects and promising wide application.
A new method Chirp-Z transform cepstrum for analysing ultrasonic scattered signals has been developed and then applied to processing the backscattered signals .
The application of Wigner-Ville distribution methods to measure the average scatterer spacing of biological tissue is demonstrated in this paper. The simulation results indicate that this method has such advantages as high spatial resolution, sensitive to the subtle variation in spatial distribution of scatterer, even in noise background.
The physics of ultrasonic scattering by blood, pulsed Doppler and duplex scanning and colour flow imaging performances determines the limits of clinical applications.
For the purpose of ultrasonic nondestructive testing of materials, holography in connection with digital reconstruction algorithms has been proposed as a modern tool to extract crack sizes from ultrasonic scattering data.
In this work we develop an ultrasonic backscattering technique for the detection of matrix cracks in each of the plies of a damaged graphite/epoxy laminated composite.
A modified model of ultrasound scattering, based on the structure of biological tissues, has been derived which assumes that the scale of elastic modulus fluctuation of tissues is statistically distributed. The result explains the observed variation of the backscattering coefficient with frequency for a number of tissues. A crude discussion about the relationship between the statistical parameters and the tissue structure is also provided.
Ultrasonic biophysicists and physicians continue to exhibit great interest in studing the properties of blood. The research of this paper has shown that compressibility of red cell appears to be inversely proportional with its hemoglobin content. Among ultrasonic attenuation produced by red cell structure level in blood absorption of red cell plays predominant role, viscous relative motion loss accounts for less than 15%, and cell scattering contribution is negligible. The coagulation process of blood is ac...
In this paper a principle and method of estimating ultrasound attenuation spectrum from a backscattering echo are described. A series of experimental studies on fresh in vitro animal soft tissues have been completed by using the established in our laboratory automatic spectrum measuring system. The obtained results show that the measurement accuracy and precision are satisfactory. It is pointed out that this method of estimating attenuation spectrum, as one can be used for ultrasound tissue characterization...
超声散射
ultrasonic scattering
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