Method for determining a target position for a medical procedure

A method for determining a location of a target position for an invasive medical procedure on a patient in a coordinate system, the method comprising:

• recording radioscopy image data of the patient in order to define the target position and an entry position for the procedure, wherein the entry position is on a surface of the patient;
• after recording the radioscopy image data of the patient, affixing an entry mark to the patient defining the coordinate system and indicating the entry position for the procedure;
• after recording the radioscopy image data of the patient, fixing a site marker to be identified in a radioscopy image in a known relative position in the coordinate system;
• after affixing the entry mark to the patient and after fixing the site marker, recording at least two 2D radioscopy images of the patient from mutually different recording directions, each image capturing the site marker and the target position, wherein the different recording directions are substantially orthogonal to each other;
• and
• determining the location of the target position in the coordinate system from a representation of the target position and a representation of the site marker in the 2D radioscopy images and the relative position of the site marker in the coordinate system.