The present invention relates to 3D-originated cardiac roadmapping. In order to improve the accuracy of the information provided to the user as navigation information, without any additional burden to the patient such as additional X-ray dose, a method is described comprising the steps of a) providing 3D+t image data of a vascular structure of an object b) acquiring two-dimensional image data of the object, which object comprises the vascular structure, the 2D image data comprising at least one 2D image c) projecting the vascular structure, thereby generating a plurality of mask images on the basis of a 3D+t image data d) registering the at least one 2D image with one of the plurality of the mask images, wherein the registration comprises finding the maximum of a similarity factor between the mask images and the at least one 2D image e) generating a combination of the at least one 2D image and a projection of the vascular structure on the basis of the 3D+t image data according to the registration and f) displaying the combination as a guiding vessel tree projection. Thus improved cardiac roadmapping in form of a topographical roadmapping is provided since the roadmapping is based on three-dimensional data.
