A computer-implemented medical method for generating augmentation information relating to a medical image, using the output of an augmented reality device having an output unit for outputting the augmentation information, the method comprising executing, on at least one processor of at least one computer (9, 11), the following steps: a) patient medical image data is acquired (S11; S21) which describes a patient image of an anatomical body part of a patient; b) geometric model data is acquired (S12; S22) which describes a geometric model of at least part of the patient's body; c) the patient image is registered (S13; S23) with the geometric model; d) augmentation information is output (S14; S25) using the output unit of the augmented reality device based on a result of registering the patient image with the geometric model, wherein the output unit of the augmented reality device comprises a head-mounted display for displaying the augmentation information, wherein the augmented reality device comprises a head-mounted distance measurement unit, and wherein at least a part of the geometric model and/or at least part of the patient image describing at least part of the anatomical body part is registered, based on a result of a distance measurement by the distance measurement unit of the augmented reality device, with a real image acquired using the augmented reality device, the real image describing the physical scene in the field of view of the augmented reality device, and describing a physical structure corresponding to the at least one of the at least part of the geometric model or the at least part of the patient image describing the at least part of the anatomical body part, wherein the physical structure is positionally tracked using a result of distance measurements by the distance measurement unit of the augmented reality device, the tracking being performed by acquiring a time series of positions of the physical structure, the position being defined in a coordinate system in which positional information included in the patient image output by the augmented reality device is defined. a) patient medical image data is acquired (S11; S21) which describes a patient image of an anatomical body part of a patient; b) geometric model data is acquired (S12; S22) which describes a geometric model of at least part of the patient's body; c) the patient image is registered (S13; S23) with the geometric model; d) augmentation information is output (S14; S25) using the output unit of the augmented reality device based on a result of registering the patient image with the geometric model, wherein the augmented reality device comprises a head-mounted distance measurement unit, and wherein at least a part of the geometric model and/or at least part of the patient image describing at least part of the anatomical body part is registered, based on a result of a distance measurement by the distance measurement unit of the augmented reality device, with a real image acquired using the augmented reality device, the real image describing the physical scene in the field of view of the augmented reality device, and describing a physical structure corresponding to the at least one of the at least part of the geometric model or the at least part of the patient image describing the at least part of the anatomical body part, wherein the physical structure is positionally tracked using a result of distance measurements by the distance measurement unit of the augmented reality device, the tracking being performed by acquiring a time series of positions of the physical structure, the position being defined in a coordinate system in which positional information included in the patient image output by the augmented reality device is defined.