الفهرس 
Introduction and Aim of the workOnly 14 pages are availabe for public view
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Abstract
Coronary artery disease remains one of the most important causes that lead to death. The results of the World Health Organization have shown that cardiovascular disease causes 25%45% of all deaths worldwide. It has been estimated that the number of deaths due to coronary artery disease will have doubled between 19852015 at which time it will displace infectious diseases as a leading cause of death. Although atherosclerotic disease of the coronary arteries is the most common cause of luminal narrowing and coronary heart disease, there are multiple nonatherosclerotic (congenital and acquired) causes of severe luminal narrowing and subsequent clinical coronary events (angina pectoris, acute myocardial infarction, and sudden death) . . Among the diagnostic tools of coronary artery disease, conventional angiography still remain the standard for detection of CAD because of its unsurpassed resolution and its interventional role . But the invasive and discomfortable criteria of conventional angiography enhances the needs for a new noninvasive and accurate method for detection of coronary lesions . In 1998, mechanical spiral CT systems with simultaneous acquisition by four detector rows and a minimum rotation time of 500 msec were introduced. This allows faster scanning that is suitable for cardiac examination and increases the accuracy of MSCT coronary angiography when compared to conventional angiography.