CANF-Comb-II PET-MR in Atherosclerosis Multisite

Inclusion Criteria:

* Adults, 18 years of age or older
* Asymptomatic carotid artery stenosis patients who have undergone carotid Doppler/ultrasound imaging or other carotid imaging which have demonstrated a ≥ 60% diameter carotid artery stenosis.
* The treating surgeon has planned either treatment with optimal medical therapy (OMT) alone, or OMT and carotid endarterectomy (CEA) surgical intervention.

Exclusion Criteria:

* Inability to receive and sign informed consent.
* Patients with an unstable clinical condition that in the opinion of the Sponsor-Investigator or designee precludes participation in the study.
* Inability to tolerate up to 60 minutes in a supine position with arms down at sides for PET-MR imaging.
* Prior history of CEA or carotid artery stent procedure on the ipsilateral side.
* Past medical history of TIA or stroke within the last 6 months.
* Unwilling to comply with study procedures and/or unable to be available for the duration of the study outlined in the protocol.
* Contraindications to MR imaging (pacemaker, brain aneurysm clips, shrapnel, claustrophobia, etc.).
* Currently pregnant or lactating. All female subjects of childbearing potential must have a documented negative pregnancy test (serum or urine hCG) performed within 24 hours immediately prior to the administration of 64Cu-25%-CANF-Comb or documented post-menopausal defined as the cessation of menses for ≥ 12 months or documentation of having a bilateral oophorectomy and/or hysterectomy.