A method for determining the movement of an organ or treatment area of a patient as well as suitable for this system

A method for determining the movement of a body organ or treatment area of ​​a patient, - in which a navigation system (5) is used comprising a plurality of sensors, the patient-specific coordinate system arranged by means of one or more of the patient (1) on or in the area spatially invariant parts of the body sensors (4) is defined, - wherein the location of at least one with respect to the moving member is substantially stationary sensor (11, 17) is determined within the coordinate system, the position of the image plane with the position data (e) a simultaneously recorded, on a monitor (9) reproduced image of itself moving organ is determined in the coordinate system, or in which the position of the image plane (e) is determined by the spatial position of the imaging system relative to the patient, - being defined within the image at least one point (P) or portion of the moving member, determines the motion related way and based on this at least one path of movement determined for the characteristic point and a monitor (10) within ...