Image system for supporting the navigation of interventional tools

The invention relates to an image system and a method for supporting the navigation of interventional tools when performing imaging controlled minimally invasive interventions within the body of a patient in a predetermined intervention plane, which serves to improve the precision and reliability of interventional accesses that are required for performing a histological tissue sample removal under CT or MRT based image-oriented monitoring, or in the context of tumor therapy or pain therapy. Directional deviations, away from the intervention plane, of the actual course of an interventional tool from a predeterminable desired course are captured and presented for display by registering the shortened represented total length or a shortened represented partial length of this interventional tool in the 2D projection representation of a fluoroscopic radioscopy recording that was recorded in a 2D projection direction running normally relative to the intervention plane.