1. A method for the 3D modeling of a three-dimensional tubular structure of an examination object from a number of 2D projection images (D) of the tubular structure (H) taken from different projection directions, comprising the steps: a) reconstruction of a 3D image (B) from the 2D projection images (D), b) selection of at least one 3D central line point (M0) in the 3D image (B), said 3D central line point being located in the tubular structure (H), c) segmentation of other 3D central line points (M) of the tubular structure (H) in the 3D image (B), d) forward projection of the 3D central line points (M), which have been segmented in the 3D image (B), into the 2D projection images (D′), e) determination of border points of the tubular structure (H) in the 2D projection images (D′) on the basis of 3D central line points (Z) that have been projected in, and f) back-projection of the border points from the 2D projection images (D′) into the 3D image (B).