A method is for calculating a personalized patient model including an external surface model of a patient and an organ model of the patient. In an embodiment, the method includes acquiring metadata of the patient, the metadata being assigned to at least one metadata category; ascertaining, using the patient metadata acquired, the external surface model of the patient and an internal anatomical model of the patient, the internal anatomical model including a body cavity of the patient; ascertaining the organ model of the patient using the patient metadata acquired and using the internal anatomical model of the patient ascertained; and calculating the personalized patient model, the external surface model of the patient ascertained and the organ model of the patient ascertained, being combined.