Abstract: The assessment of myocardial viability is clinically significant for doctors in determining which patient to undergo coronary artery bypass graft (CABG), and pridicting the sugery effect and prognosis as well. ²⁰¹T1 rest/redistribution imaging can effectively and economically assess the myocardial viability, The gated SPECT imaging can provide the motion information of the myocardium which enhance the sensitivity and specificity in evaluating the myocardial viability in some equivocal cases. ¹⁸F-FDG myocardial metabolic imaging combined with myocardial perfusion imaging still remain as the "Golden Standard" in assessing the myocardial viability. Besides, myocardial perfusion imaging can effectively distinguish the re-stenosis from new coronary arterial stenosis in post-CABG patients with angina symptoms.