Magnetic resonance imaging methods. Participants will perform MRI examination on 1.5 - T GE CV/i system. Short and long-axis of the heart will be obtained during breath-hold and triggered on electrocardiogram pulse sequences. The first sequence will be a gradient-echo (steady-sate free procession) to assess left ventricular (LV) and right ventricular (RV) morphology and function. The second sequence will be an inversion-recovery prepared gradient-echo to obtain MDE (10 to 20 minutes after intravenous bolus of 0.2 mmol/Kg of gadolinium-based contrast). We will use the following parameters: repetition time 3.9/7.1ms, echo time 1.7/3.1 ms, flip angle 45º/20º, cardiac phases 20/1, views per segment 8/16 to 32, matrix 256 x 128/256 x 192, slice thickness 8/8mm, gap between slices 2/2mm and field of view 32 to 38/32 to 38 cm, inversion time none/150 to 250 ms, receiver bandwidth 125/31,25 kHz, number of excitations 1/2.