Visualizing ultrasonic vector velocity using the motion without movement algorithm

The visualization of ultrasonic vector velocity data is a non-trivial task. The data is five-dimensional: x, y, velocity magnitude, velocity direction, and time. Most techniques have so far failed to deliver an intuitive approach to displaying such complex data. The motion without movement technique uses time variations in phase to create the illusion of motion without moving the pattern to be displayed. It has been applied to (a) a stationary image, (b) phantom ultrasonic data, and (c) in vivo data and has proved to be a viable alternative to existing techniques. For this study, the speckle projection technique has been used to obtain vector velocity data from a sequence of ultrasonic frames.