Coronary Computed Tomographic Angiography

The goal of this clinical data collection study is to collect raw CT scan data using a new GSI Cardiac mode on GE HealthCare's Revolution Apex CT system. Two groups of participants will be enrolled: A) Participants scheduled to undergo a Coronary CT Angiography (CCTA) as part of their standard of care B) Participants scheduled to undergo a cardiac catheterization or have a history of heart attack Participants in Group A will: -Have a standard of care CCTA immediately followed by a research GSI Cardiac scan Participants in Group B will: -Have a research CCTA immediately followed by a research GSI Cardiac scan Both groups will be in the study for approximately 1 day. There are no follow-up visits after the day of scan.