1. CAIN-2 NaF pilot Characterizing Atherosclerotic Plaque with Sodium Fluoride Positron Emission Tomography- A Sub-Study of the Canadian Atherosclerosis Imaging Network (CAIN Project 2), - patients undergo sodium fluoride (NaF) PET/CT with CTA instead of FDG PET/CT preoperatively. All other imaging and study procedures are carried out as per the CAIN-2 study.