1. A computer-implemented method for pre-processing image data of a three-dimensional volume comprising: providing the image data of a vessel; applying a super-sampling filter to the image data to generate super-sampled image data having an increased resolution as compared to the image data; applying an unsharp masking filter to the super-sampled image data for increasing contrast of an edge of the vessel; applying a de-noising filer for removing noise surrounding the edge after applying the unsharp masking filter; and storing the image data after applying the de-noising filter thereto.