1. A method for computer aided detection of pulmonary emboli, comprising: acquiring medical image data; identifying a pulmonary embolism candidate comprising a cluster of voxels; determining whether the candidate is a true pulmonary embolism or a false positive based on a spatial distribution of intensity values for the voxels of the cluster of voxels; and present the pulmonary embolism candidate to a user when the candidate is determined to be a true pulmonary embolism.