Pulmonary Embolism - Prognosis Pulmonary embolism is diagnosed by using a computed tomography pulmonary angiogram which includes the injection of the dye in the blood vessel ahead of the scan is taken. Filters: Positioned while in the vena cava to stop clots from achieving the center to stop sudden collapse https://sgvasculargrp.com/medical-condition/deep-vein-thrombosis/