Linear System Models for Ultrasonic Imaging: Intensity Signal Statistics.

ABSTRACT: Despite a great deal of work characterizing the statistical properties of radio frequency backscattered ultrasound signals, less is known about the statistical properties of demodulated intensity signals. Analysis of intensity is made more difficult by a strong nonlinearity that arises in the process of demodulation. This limits our ability to characterize the spatial resolution and noise properties of B-mode ultrasound images. In this paper, we generalize earlier results on two-point intensity covariance using a multivariate systems approach. We derive the mean and autocovariance function of the intensity signal under Gaussian assumptions on both the object scattering function and acquisition noise, and with the assumption of a locally shift-invariant pulse-echo system function. We invest

SUBMITTER: Abbey CK 

PROVIDER: S-EPMC5480407 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature