Many recent publications have reported encouraging results on diagnostic cardiac multislice CT performance in 1) coronary artery disease, 2) coronary arterial bypass graft potency and 3) intrastent restenosis.

These single center studies were made on a limited number of patients (range, 50-130) and focused mainly on one of the indications mentioned above.

Moreover, results were often given after exclusion of low quality examinations. At last, no study has compared the diagnostic performance of the different CT systems '16, 40 and 64) in these populations.

These single center studies were made on a limited number of patients (range, 50-130) and focused mainly on one of the indications mentioned above.

Moreover, results were often given after exclusion of low quality examinations. At last, no study has compared the diagnostic performance of the different CT systems '16, 40 and 64) in these populations.

Inclusion Criteria:

• Patients' ≥18 years, of both sexes
• Coronary angiography in patients with suspected of known CAD, instable clinical conditions.
• Clinical status allowing performance of coronary angiography 48 à 72h after CT examination
• Informed consent signed by patient

Exclusion Criteria:

• Patients in whom clinical status does not allow delayed coronary angiography
• Irregular heart rate, in particular atrial fibrillation
• Renal insufficiency (serum creatinine >150 µmol/l
• Radiology examination with use of iodin agent with 48h before) CT coronary
• K now intolerance to iodin agents
• Patients unable to hold breathing < 20 seconds
• Pregnancy