Coded ultrasound for blood flow estimation using subband processing

Blood velocities estimation using ultrasound

This thesis consists of two parts. In the first part, the iterative data-adaptive BIAA spectral estimation technique was extended to estimate lateral blood velocities using ultrasound scanners. The BIAA method makes no assumption on samples depth or sampling pattern, and therefore allows for transmission in duplex mode imaging. The technique was examined on a realistic Field II simulation data ...

Signal processing in diagnostic ultrasound: Algorithms for real-time estimation and visualization of blood flow velocity

Ultrasound Color Flow Imaging (CFI) has become a valuable tool in a wide rangeof medical applications where information about blood flow can be related to thediagnosis of disease, as for instance in the cardiovascular system. The modalityprovides a map of blood velocity and direction in a twoor three-dimensional regionof interest, where abnormal blood flow patterns can be detect...

Estimation of total hepatic blood flow by duplex ultrasound.

The volume flow rate of blood in the portal vein and the hepatic artery was measured using a duplex ultrasound system. Two sections of the hepatic artery were studied; the common hepatic artery where measurements were made just after the bifurcation of the coeliac axis to splenic and hepatic arteries and the hepatic artery itself, where measurements were made just proximal to the porta hepatis ...

Artifacts in Blood Velocity Estimation Using Ultrasound and Cross-correlation Artifacts in Blood Velocity Estimation Using Ultrasound and Cross-correlation

Estimation of blood velocities using ultrasound and time-domain cross-correlation is investigated. The measurement principle is introduced and the basic properties of the cross-correlation function is discussed. Expressions for the variance of the estimates of the peak location are given showing the innuence of integration time, transducer bandwidth and signal-to-noise ratio. It is also shown t...

Two-Dimensional Blood Flow Velocity Estimation Using Ultrasound Speckle Pattern Dependence On Scan Direction And Velocity