Vector velocity estimation of blood flow – A new application in medical ultrasound

Vector blood velocity estimation in medical ultrasound

Two methods for making vector velocity estimation in medical ultrasound are presented. All of the techniques can find both the axial and transverse velocity in the image and can be used for displaying both the correct velocity magnitude and direction. The first method uses a transverse oscillation in the ultrasound field to find the transverse velocity. In-vivo examples from the carotid artery ...

A new estimator for vector velocity estimation.

A new estimator for determining the two-dimensional velocity vector using a pulsed ultrasound field is derived. The estimator uses a transversely modulated ultrasound field for probing the moving medium under investigation. A modified autocorrelation approach is used in the velocity estimation. The new estimator automatically compensates for the axial velocity when determining the transverse ve...

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

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...

comparison of blood flow velocity changes in posterior cerebral artery measured with transcranial doppler sonography in migraineurs with visual aura and normal persons after photostimulation

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