Tc99m Macroaggregated Albumin Bronchial Artery Study

Inclusion Criteria: * Subjects 18 years of age and older * Patients with known active lung cancer with a history of prior hemoptysis presenting for bronchial artery embolization will be considered. * Patients must be presenting for secondary prophylaxis of hemoptysis * Willing and able to understand and sign a written informed consent document. * Willing and able to undergo all study procedures. Exclusion Criteria: * Patients with current active hemoptysis * Any acute or chronic inflammatory disease or medical conditions that in the investigator's opinion may interfere with the study procedures or the interpretation of the study results. * If female, not of childbearing potential or negative serum β-human chorionic gonadotropin pregnancy test prior to radiotracer injection. * If female, not nursing. * Subjects who have exclusion criteria that would prevent them from receiving a CT scan or fluoroscopy, or administration of contrast. * History of allergic reactions attributed to compounds of similar chemical or biologic composition to macro-aggregated albumin