Abstract: The present invention relates to a method for determining and/or identifying a change in the position of a part of a body structure relative to a marker device by means of a data processing device, comprising the steps of: providing pre-operative data of the body structure which comprises information concerning the pre-operative position of the part of the body structure relative to the marker device; providing intra-operative data of the body structure which comprises information concerning the intra-operative position of the part of the body structure relative to the marker device; and in order to determine whether a change in position has occurred, automatically determining—on the basis of the pre-operative position of the part and the intra-operative position of the part—whether the position of the pre-operative part differs from the position of the intra-operative part and/or automatically displaying the pre-operative position of the part and the intra-operative position of the part, such that a diffe

Abstract: A method and device for detecting and displaying an anatomical patient structure in a region of interest of a movable image detection apparatus such as an ultrasound probe. After the region of interest is defined in a patient coordinate system, movement of the image detection apparatus can be tracked, and the position of the region of interest can be changed or shifted to compensate for the movement of the image detection apparatus.