A method is disclosed for supporting radiation treatment planning for a patient. In an embodiment, the method includes acquiring computed tomography image data for the patient, which has been acquired from the patient using a computed tomography device； allocating magnetic resonance image data to the computed tomography image data using the computed tomography image data, wherein the magnetic resonance image data has been acquired from at least one examination subject that differs from the patient using a magnetic resonance unit； and providing the computed tomography image data together with the magnetic resonance image data allocated to the computed tomography image data to support the radiation treatment planning for the patient.
