1. A method for using magnetic resonance images obtained by a magnetic resonance imaging scanner which generates a magnetic field with a magnetic center (isocenter), as origin for locating anatomical targets in a patient, wherein at least one fiducial marker is applied to the body of the patient at a distance from the isocenter, comprising the following steps: obtaining a first magnetic resonance image of the anatomical target, wherein the anatomical target has an accurate geometrical position, obtaining a second magnetic resonance image at a shifted position, wherein the fiducial marker has an accurate geometrical position; and merging the accurate geometrical position of the target sand the accurate geometrical position of the fiducial marker in a single image.