Study to Image Inflammatory Activity of a Fluorescence Imaging Agent in Excised Human Artery Plaques

Inclusion Criteria: * Must have an established diagnosis of severe carotid or peripheral arterial disease (ischemic or aneurysmal) requiring surgery and be sufficiently healthy to undergo surgery * Must be age of 18 years or older * Must be able to give informed consent * Women with childbearing potential must have a negative pregnancy test * Estimated glomerular filtration rate ≥ 60 mL/min/1.73 m2 (mild renal impairment Exclusion Criteria: * History of allergic reaction to oral or intravenous contrast agents * History of allergic reaction to polyethylene glycol (PEG) * History of allergic or anaphylactic reactions * Participants who have taken an investigational drug within 14 days of enrollment. * Participants with hemodynamic instability * Any history of renal failure (estimated Glomerular Filtration Rate (eGFR) \<60ml/min/1.73 m2) * Pregnant or lactating females * Participants with uncontrolled hypertension defined as persistent systolic blood pressure \> 180 mm Hg, or diastolic blood pressure \> 110 mm Hg; those subjects with known HTN should be under these values while under pharmaceutical therapy * Severe concurrent illnesses including, but not limited to ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, COPD or asthma requiring hospitalization within the past 12 months, or psychiatric illness/social situations that would limit compliance with study requirements