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 hardware processor configured to process the images by at least: 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 by: tracing a pulmonary trunk in the set of images in a cranial to caudal direction; summing intensity values of binary image pixels based on the set of images to form a sum; comparing the sum to a threshold; and identifying a hypo-attenuating focus when the sum is greater than the threshold; iv. evaluating the pulmonary embolism candidates in three-dimensional (3D) space; and v. generating a report indicating evaluated candidate pulmonary embolisms; and an output for displaying the report.