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Background: Magnetic Resonance (MR) is one of the newest achievements in diagnostic medicine. Practical validation of MR in cardiovascular diseases is very important, due to growing interest of cardiologists in this method and information in literature about usefulness of MR in cardiology. Material/Methods: In years 1996-2004, Lower Silesian Center of Diagnostic Imaging examined 134 patients with cardiovascular diseases with MR. Coarctation of the aorta (CoA) - 23 cases, patients after correction of the CoA - 17 cases, hypoplastic aortic arch - 5 cases, complex aortic arch abnormalities - 7 cases, congenital cardiac defects - 9 cases, patients after surgical correction of the heart defect - 12 cases, control after heart operation in an adult - 1 case, suspicion of arrhythmogenic right ventriculardysplasia (ARVD), myocarditis and cardiomyopathies - 32 cases, primary and secondary tumors of the heart - 4 cases, left ventricle aneurysms - 9 cases. All the patients underwent USG examination, in 25 cases digital subtraction angiography (DSA) and hemodynamic examination were performed. In 6 cases CT of the chest was performed. Correlation between MR and USG, DSA, CT examinations was evaluated. Results/Conclusions: In our material, the best results of MR examinations were achieved in diagnostics of the thoracic aorta disease. Measurements of the aorta diameter in MR strictly correlate with the results obtained in USG examination. In complex aortic arch abnormalities, MR seldom can replace DSA examination - only in easier cases, but it can help and reduce the time of DSA examination. MR may evaluate the pulmonary trunk and pulmonary vessels. MR perfectly visualizes morphology of the cardiac chambers, their spatial relationship, contractility and connection to great vessels. Assessment of septal defects and valves morphology in MR is inferior to USG examination. MR enables recognition of the ARVD. Less satisfactory results were obtained in diagnostics of myocarditis. MR is a perfect method of visualization and evaluation of cardiac tumors bigger than 5 mm.