Real-time system for angle-independent US of blood flow in two dimensions: initial results.

The authors developed an ultrasound system that enables the speckle patterns produced by echoes from moving blood to be tracked in real time. Unlike current color Doppler flow imagers, this system allows the measurement of blood velocities in any direction within the imaging plane. The authors used this device to image flow in the human jugular vein and contrasted the image with one obtained under similar circumstances with color Doppler flow imaging. The authors demonstrated that this system can display in vivo lateral blood flow in real time. Further development of the system, including the incorporation of wall filters to enhance weak blood echoes and parallel techniques to reduce data acquisition time, will allow clinical imaging of flow with velocities of several meters per second in any direction without aliasing or dependence on the Doppler angle.