A computer-implemented medical method for verifying a relative position of a plurality of anatomical structures of interest of a patient, the method comprising the following steps: a) planning data is acquired, describing at least one planning-image showing the plurality of anatomical structures; b) first identification data is determined based on the planning data, describing a position of at least two of the plurality of anatomical structures of interest within the at least one planning-image; c) verification data is acquired describing at least one verification-image showing the least two of the plurality of anatomical structures of interest at a point in time later than the planning-image; d) second identification data is determined based on the verification data, particularly based on the verification data and the first identification data, describing a position of the at least two of the plurality of the anatomical structures of interest within the at least one verification-image; the method being characterized by the following steps: e) transformation data is determined based on the first identification data and the second identification data, describing, for each one of the at least two anatomical structures, a distinct image fusion transformation; and f) evaluation data is determined based on the transformation data, describing, for a first image fusion transformation determined for a first anatomical structure, whether a deviation of the position of the first anatomical structure from its position shown in the at least one planning-image is within a predetermined threshold as compared with a deviation of the position of a second anatomical structure from its position shown in the at least one planning-image, which is shown by a second image fusion transformation determined for the second anatomical structure. a) planning data is acquired, describing at least one planning-image showing the plurality of anatomical structures; b) first identification data is determined based on the planning data, describing a position of at least two of the plurality of anatomical structures of interest within the at least one planning-image; c) verification data is acquired describing at least one verification-image showing the least two of the plurality of anatomical structures of interest at a point in time later than the planning-image; d) second identification data is determined based on the verification data, particularly based on the verification data and the first identification data, describing a position of the at least two of the plurality of the anatomical structures of interest within the at least one verification-image; the method being characterized by the following steps: e) transformation data is determined based on the first identification data and the second identification data, describing, for each one of the at least two anatomical structures, a distinct image fusion transformation; and f) evaluation data is determined based on the transformation data, describing, for a first image fusion transformation determined for a first anatomical structure, whether a deviation of the position of the first anatomical structure from its position shown in the at least one planning-image is within a predetermined threshold as compared with a deviation of the position of a second anatomical structure from its position shown in the at least one planning-image, which is shown by a second image fusion transformation determined for the second anatomical structure.