Abstract: A method of lung lobe segmentation having the steps of: providing of three dimensional first image data of a lung; segmentation of a tubular structure to identify first voxels of the first image data belonging to the tubular structure and to identify second voxels of the first image data which do not belong to the tubular structure; determining a distance measure for each one of the second voxels, by determining a minimum distance between each one of the second voxels to one of the first voxels to provide second image data; and performing a lobe segmentation based on the second image data.