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Without disturbing the observed processes, the MRI methods combined with the dissolution studies provide insight into the phenomena occurring when the dosage form comes into contact with aqueous fluids. The MR images allow one to observe the solvent penetration into the hydrophilic matrix and the hydrogel formation. The data obtained in the MRI studies complement information obtained from the dissolution studies. The analysis of MR images may support the explanation of differences in the drug-releasing or floating properties of HBS.