The evaluation of cardiac asynchrony has become a very important item to assess heart failure and to select candidates to cardiac resynchronization therapy (CRT). However, despite the many thechniques to evaluate this issue none of them have shown enough evidence to predict the benefits of the CRT. This article proposes a new method to assess cardiac asynchrony using equilibrium radionuclide angiography images and applies it in two groups of subjects, normal and non-healthy subjects. The results shows that this propose might be helpful to improve selection criteria for CRT.