Apparatus for detecting, tracking and imaging movement.

摘要

Apparatus o POUND the invention includes means (5) for providing a difference signal representing the difference between first and second video signals representing earlier and later scans or numbers of scans respectively of an area being surveyed. The difference signal represents movement that has taken place between the earlier and later scans, and is fed to peak hold circuitry (6) in which it is broken up into pixel-sized bytes or subelements. If any byte is above a threshold value the associated pixel of a video display screen (7) is displayed and is maintained in the displayed condition for subsequent scans and comparisons. A track of the movement is thus built up across the screen (7). The apparatus may take the form of digital vascular imaging apparatus, in which case the first and second video signals are the successive outputs of fluoroscopic X-ray apparatus, and the movement detected and imaged is the movement of a leading edge of a contrast agent injected into the vascular system.