Abstract
Background: Imaging has a critical role in the diagnosis and evaluation of cardiac diseases, beginning with chest radiography and fluoro-scopy and progressing to coronary angio-graphy, echocardiography, nuclear medicine and recently multidetector computed tomo-graphy (MDCT) as well as magnetic resonance (MR) imaging
 Objective: To highlight the role of Multi-detector CT in the evaluation of coronary artery disease and its importance of being noninvasive diagnostic technique.
 Methods: A cross sectional study for 20 patients. Patients were asked to fast 6 hours prior to the examination and the patients with heart rates above 65 beats per minute were given cardio-selective beta-blocker and for heart rate above 75 (up to 85) beat/min, the best systole phase was used for reconstructing our images
 Results: for Evaluation of native coronary arteries, the CTCA showed significant lesions (occlusion or >60 % stenosis) in the native arteries of 13 patients and insignificant lesions in 7 patients. 
 Evaluation of CABG (8 arterial grafts); for (LIMA) graft, 83% were patented, and 17% were narrowed and 100 % of (radial graft) were patent. For Venous Grafts the study included 10 venous grafts; 70 % were patent, 20% were narrowed and 10 % were totally occluded.
 Conclusion: The multi-slice CTCA is now a clinically reliable noninvasive tool that allows the evaluation of the native coronary arteries, the bypass grafts, coronary stents.
Highlights
Coronary artery disease (CAD) and other acquired and congenital cardiac diseases are major medical and socioeconomic problems (1)
Imaging has had a critical role in the diagnosis and evaluation of cardiac disease, beginning with chest radiography and fluoroscopy and progressing to coronary angiography, echocardiography, nuclear medicine and recently multidetector computed tomography (MDCT) as well as magnetic resonance (MR) imaging) (2)
The total number of examined segments was 260 considering[13] segments in each of the examined 20 coronary systems according to the model suggested by the American Heart Association (AHA)
Summary
Coronary artery disease (CAD) and other acquired and congenital cardiac diseases are major medical and socioeconomic problems (1). Imaging has had a critical role in the diagnosis and evaluation of cardiac disease, beginning with chest radiography and fluoroscopy and progressing to coronary angiography, echocardiography, nuclear medicine and recently multidetector computed tomography (MDCT) as well as magnetic resonance (MR) imaging) (2). Conventional invasive coronary angiography is currently the diagnostic criterion standard for clinical evaluation of known or suspected coronary artery disease (CAD) (3). Imaging has a critical role in the diagnosis and evaluation of cardiac diseases, beginning with chest radiography and fluoroscopy and progressing to coronary angiography, echocardiography, nuclear medicine and recently multidetector computed tomography (MDCT) as well as magnetic resonance (MR) imaging Objective: To highlight the role of Multidetector CT in the evaluation of coronary artery disease and its importance of being noninvasive diagnostic technique.
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