1. A system for detecting pulmonary embolisms in a subject's vasculature, the system comprising: an input configured to receive images acquired from a subject; a processor configured to process the images with steps comprising: i. receiving, using the input, a set of images representing a vasculature of the subject's lungs; ii. analyzing the set of images to segment the main arteries associated with the subject's lungs and separate the main arteries from surrounding tissues; iii. extracting pulmonary embolism candidates from the set of images after segmenting and separating the main arteries; vi. evaluating the pulmonary embolism candidates in three-dimensional (3D) space by applying a series of rules; v. generating a report indicating evaluated candidate pulmonary embolisms; and an output for displaying the report.