Method of determining vessel fluid flow velocity

Abstract

Image data of contrast dye in a vessel in a body is acquired for determining flow rate. Based on images acquired under and angle relative to one another, a three-dimensional model of the vessel is constructed and length of a vessel section is determined. A series of at least two images, apart in time, under a first angle is assessed for determining progress of a front of the dye bolus in the vessel in time. In the images, the vessel may be segmented and brightness or a derivative thereof over at least one of time and distance may be assessed to determine the front. Progress distance is mapped to the three-dimensional model, for example by mapping segments from the image to the model, to obtain a more accurate and natural distance of progress over time. Flow rate is determined by natural progress distance over progress time.