Patent ID: 8805479

Claim:
A system for determining a functional property of a moving object without direct imaging of the moving object itself, the system comprising: a tag configured to be in direct contact with the moving object such that the tag follows movement of the moving object, wherein the moving object is the heart of a subject; an imager configured to provide images of the tag; a movement determination device configured to determine movement of the tag based on the images of the tag; and a functional property determination device configured to determine the functional property of the moving object from the determined movement of the tag, wherein the functional property is a degree of synchrony between cardiac chambers of the heart or a cardiac output, wherein the tag comprises an electrode configured to influence the movement of the moving object by electrically pacing the heart, wherein the electrode is changeable at least between a first influencing condition and a second influencing condition, wherein the movement determination device and the electrode are controllable such that a first movement of the tag is determined when the electrode is in the first influencing condition and that a second movement of the tag is determined when the electrode is in the second influencing condition, and wherein the functional property determination device is controllable such that the functional property is determined at least twice, one time from the first movement of the tag and another time from the second movement of the tag, in order to determine the influence of the electrode on the functional property of the moving object.