A method for quantitative flow analysis of a fluid flowing in a conduit from sequences of consecutive image frames of such a conduit, which image frames are timely separated by a certain time interval, the method comprising:a) selecting a start frame and an end frame from the sequence either automatically or upon user input；b) determining a centreline of the conduit in the start frame；c) determining a centreline of the conduit in the end frame；d) selecting a common start point on the centreline of the start frame and on the centreline of the end frame either automatically or upon user input；e) selecting an end point on the centreline of the start frame；f) selecting an end point on the centreline of the end frame；g) calculating centreline distance between start point and end point of the start frame；h) calculating centreline distance between start point and end point of the end frame；i) calculating a local flow velocity as a function of centreline distances and time interval between start frame and end frame.A corresponding device and computer program are also disclosed.
