1. A method for segmentation of a volumetric image dataset, said method comprising: performing, by an image-processing device, an initial segmentation of an input volumetric image dataset to obtain a main vessel structure and a plurality of broken segments; computing, by said image-processing device, a weighted path between said main vessel structure and a broken segment of said plurality of broken segments based on at least one or more parameters associated with a first voxel of said broken segment of said plurality of broken segments and a second voxel of said main vessel structure; determining, by said image-processing device, a valid weighted path between said main vessel structure and a broken segment of said plurality of broken segments based on said computed weighted path and one or more pre-specified conditions; and generating, by said image-processing device, an output volumetric image dataset by performing a final segmentation on a gradient field based on said determined valid weighted path.