Cardiothoracic Imaging
Contents Anatomy Techniques Findings Cases References


Pulmonary embolus, case 2


Nuclear ventillation
Nuclear perfusion


Chest radiographs of patients suspected of pulmonary emboli are often unrevealing. Nuclear perfusion imaging is achieved by venous injection of radioactive technetium 99-m labelled macroaggregated albumin. The small albumin particles travel from the venous injection and are dispersed into the pulmonary vasculature. Areas of blocked pulmonary vessels fail to show radioactivity and multiple angled views of the chest after the radioactive injection allow definition of segmental or subsegmental photon deficits suspicious of regions of the pulmonary vasculature obstructed by emboli.


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Copyright 2004, Yale University School of Medicine. All rights reserved.
December 18, 2004 (PL)
version b.003