Pulmonary Embolism - Prognosis Pulmonary embolism is diagnosed via a computed tomography pulmonary angiogram which involves the injection of a dye in the blood vessel prior to the scan is taken. Filters: Positioned in the vena cava to stop clots from achieving the center in order to avoid unexpected collapse https://sgvasculargrp.com/medical-condition/deep-vein-thrombosis/