4. cost of any subsequent radiographic testing needed for incidental findings found on MSCT over the following 24 months The cost of the different diagnostic tests utilized (coronary MSCT angiography, exercise treadmill testing, myocardial perfusion testing, exercise echocardiography, coronary angiography, and other radiographic tests) and clinical encounters (inpatient admissions, ED evaluations, outpatient evaluations) will be estimated from current Medicare reimbursement rates.