RecruitingDiagnostic testPET/CT* vs. Cardiac CT for Detecting Coronary Atherosclerotic Disease [*PET: Positron Emission Tomography; CT: Computed Tomography]Early detection of coronary atherosclerotic disease facilitates adequate prevention. The purpose of this study is to compare an assessment of coronary atherosclerotic disease burden by positron emission tomography / computed tomography (NaF-PET/CT) with those of conventional and ultra-high-resolution-CT (UHR-CT) in patients with suspected coronary artery disease. For this purpose, the investigators plan to include 33 patients with symptoms concerning for CAD who have been referred for cardiac CT testing.