Coronary CT angiography provides cross sectional information and help in diagnosis and management of ischemic heart disease. Ct angiography is safe, comfortable and accurate for diagnostic imaging. CTA proves that regardless of lesion severity the presence of soft and mixed plaques can cause significant cardiovascular events scoring over a clinical risk model. CT is used in the ER for patients with chest pain and low to intermediate risk for CHD, Patients with non-obstructive plaque and mild to moderate stenosis etc. CT Angiography is useful for percutaneuous coronary intervention, myocardial injury and thrombolysis. Myocardial computed tomography perfusion has the potential to enhance the diagnostic capabilities of CTA. CT ANGIOGRAPHY also be used in Regression in the size of the plaque can be well assessed by CT. for appropriate and effective understanding results the recommendations from nine specialty societies should be follow.