| Autor: |
Cheung, Alex T. M., Buchen, Peter W., Macaskill, Charles, Robinson, David E. |
| Zdroj: |
Journal of the Acoustical Society of America; 1989, Vol. 86 Issue 1, p407-413, 7p |
| Abstrakt: |
This paper investigates the backscatter spectrum of acoustic beams and plane waves from a particular distribution of discrete scatterers. The distribution is a random spatial perturbation from some underlying regular structure. Models of this type are considered as crude representations of biological tissue, such as the liver. It is shown that, for plane waves, the random perturbations of the scatterers act as a linear filter of the backscatter response. The analytic form of the filter function is directly related to the probability distribution of the spatial perturbations. It is further demonstrated that a similar result holds for acoustic beams, if the lateral scale of the beam variations is large compared with the mean scatterer separations. The impact of this result on ultrasonic tissue characterization studies using attenuation measurements is discussed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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