1. A method comprising: for each voxel in a patient-specific image data set and for each of one or more vascular regions of interest, determining, by a computing system, a probability that the voxel belongs to the vascular region of interest; segmenting patient-specific vasculature in the patient-specific image data set to generate a set of nodes and edges representative of the patient-specific vasculature; for each node and edge, assigning, by the computing system, a classification based on one or more vessel statistics associated with each node and edge, the classification indicative of which of the one or more vascular regions of interest the associated voxel belongs; determining, by the computing system, to which of the one or more vascular regions of interest each voxel in the patient-specific image data set belongs based on the probability and the classification for each voxel; and generating, by the computing system and for display, a rendering of the one or more patient-specific vascular regions of interest based on the determination.