1. A device for visualizing virtual objects in angiographic applications adapted to display a 3D or 4D medical image and a corresponding calibrated 2D X-ray image on a displaying device, wherein the 3D or 4D medical image is co-registered with the calibrated 2D X-ray image, wherein the device is adapted to display the 2D X-ray image, the co-registered 3D or 4D medical image and an interactive virtual mirror viewed from the viewpoint of the X-ray source of the X-ray imaging system in a common coordinate system, and the device is further adapted to provide on the displaying device full integration and combined visualization of the 3D or 4D medical image, the 2D X-ray image and the virtual mirror, which reflects the 3D or 4D medical image.