Patients assigned to the “mandatory coronary MSCT angiography” arm will be scheduled for coronary MSCT angiography on an outpatient basis. The procedure for coronary MSCT angiography is described below. After completion of coronary MSCT angiography, the results will be provided to the referring physician. Additional selection of testing, consultation, or therapy is at the discretion of the referring physician. The protocol will not predetermine the clinical course for the subject following coronary MSCT angiography.