SPECT myocardial perfusion imaging scan * The steps ofpatients preparationg, the procedure of aquisation and processing images according tothe American Society of Nuclear Cardiology imaging guidelines (2010) for nuclear cardiology procedures: stress protocols and tracers. Single photon-emission computed tomography. * Procedure: ECG gated SPECT with Tc99 m - MIBI at 0.31 mCi / kg body weight.