PET Imaging of MMP Activation in AAA: Clinical Component

Inclusion Criteria: Healthy Volunteers

* No history of claustrophobia or other preventing condition that has previously or would interfere with completion of protocol-specified imaging sessions.
* Able to comprehend and willing to follow instructions for the study procedures as called for by the protocol.
* Capable of lying still and supine within the PET/CT scanner for \~1 hour and follow instructions for breathing protocol during the CT portion.
* No illicit drug use or other inhaled drug use (including pharmacologic agents, recreational agents, or illicit drugs) within the past year.
* No known history of cardiac, pulmonary, hepatic or renal disease or diabetes
* BMI ≤ 40

Exclusion Criteria: Healthy Volunteers

* Inability to receive and sign informed consent;
* Pregnant (confirmed by urine pregnancy test) and/or breastfeeding
* Patient with chronic renal disease whose glomerular filtration rate (GFR) is less than 30 mL/min/1.73 m2
* Patients with an unstable clinical condition that in the opinion of the principal investigators or designee precludes participation in the study.
* Is deemed likely to be unable to perform all research procedures for any reason, (e.g., subjects unable to lie still or inability to tolerate up to 60 minutes in a supine position with arms up during the PET imaging procedures due to chronic back/shoulder pain or arthritis as assessed by physical examination and medical history).
* Currently using recreational drugs.
* Body weight of \>300 lbs. (weight limit of the PET table).
* Currently enrolled in another study using an investigational drug or underwent a study the last year involving investigational use of radiotracers or CT would confound results or with a radiation exposure when combined with this study would be deemed as excessive by the Sponsor-Investigator.

Inclusion Criteria: Patients with AAA electively or semi-electively scheduled for surgical repair

* Men or women 40-80 years of age
* Willing and able to provide informed consent
* Medically managed hypertension and hyperlipidemia
* No history of claustrophobia or other preventing condition that has previously or would interfere with completion of protocol-specified imaging sessions
* Able to comprehend and willing to follow instructions for the study procedures as called for by the protocol
* Patients with AAA indicated for surgical repair (5.0 \[female\] - 5.5cm \[male\]), incidentally identified large(r) AAAs (\>5.5 or 6.0 cm), and rapidly expanding AAAs (\> 0.5 cm in 6 months or \> 1 cm in 12 months) per Guidelines of the Society for Vascular Surgery.

Exclusion Criteria: Patients with AAA electively or semi-electively scheduled for surgical repair

* Inability to receive and sign informed consent.
* Currently enrolled in another study using an investigational drug
* Pregnant (confirmed by urine pregnancy test) and/or breastfeeding
* Patient with chronic renal disease whose GFR is less than 30 mL/min/1.73 m2
* Documented allergy to iodinated contrast and/or shellfish
* Patients with an unstable clinical condition that in the opinion of the principal investigators or designee precludes participation in the study.
* Inability to tolerate 60 minutes in a supine position with arms down at sides, as necessary for PET/CT.
* Other conditions such as symptomatic/recently treated coronary disease, cancer requiring oncologic management, or autoimmune/inflammatory diseases (e.g., rheumatoid arthritis or multiple sclerosis).
* Non-AAA volunteers may not carry a diagnosis of aortoiliac occlusive disease, as documented by their treating vascular surgeon, as significantly progressed atherosclerotic disease may demonstrate exaggerated, associated MMP activity.