Abstract: The measurement of the myocardial viability is important to evaluate the prognosis and select the operation pattern of the patients undergoing the coronary bypass surgery.Various techniques have been developed to identify viable myocardium including ¹⁸F-FDG PET,¹⁸F-FDG SPECT,²⁰¹Tl SPECT,⁹⁹Tc^m-sestamibi SPECT and fatty acid imaging in the nuclear medicine.The other clinical techniques including the dobutamine stress echocardiography and magnetic resonance imaging (MRI)methods can also assess myocardial viability.