1. A method for detecting pulmonary embolisms in computed tomographic (CT) angiography, said method comprising the steps of: providing a digitized (CT) image acquired from inside a pulmonary vessel, said image comprising a plurality of intensities corresponding to a 3-dimensional grid of voxels; for each voxel in said image, extracting a first pulmonary embolism (PE) candidate and PE boundary from said voxel; and for each voxel in said PE boundary, selecting a voxel from said PE boundary; extracting a subsequent PE candidate and PE boundary from said voxel; merging said subsequent PE candidate with said first PE candidate; and merging said subsequent PE boundary with said first PE boundary.