Ultrasound RF signal, backscattered from an inhomogeneous parenchymal tissue has the character of a random signal, which is responsible for the speckle pattern observed in the images. However, the statistical nature of the RF signal depends, not only on the random tissue scattering structure, but also on the resolution cell volume of the imaging system. Based on a stochastic model, a quantitative relationship exists between the statistics of the RF signals, statistics of the tissues scattering structure and the resolution of the imaging system. In this paper, we report, through simulation process, results confirming the theoretical predictions. In generating one dimensional A-line RF signals, the three dimensional nature of the scattering process has been taken into account. Interrogation with a frequency modulated pulse has been proposed which can be used to change the resolution cell volume. It's usefulness is demonstrated in estimating the mean scatterer spacing in the random tissue model.
Date of creation, presentation, or exhibit
Department, Program, or Center
Chester F. Carlson Center for Imaging Science (COS)
Rao, Navalgund and Zhu, Hui, "Stochastic signal processing for tissue characterization with ultrasound: a simulation study" (1990). Accessed from
RIT – Main Campus