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The paper presents the use of a software package for the analysis of medical images. MammoViewer, which has been designed to help in mammographical diagnosis, is also applied to processing images of other modalities. Algorithms of data multiresolution analysis by a selection of wavelet filters, several kinds of decomposition (dyadic, packets, undecimated wavelets, 2D kernels on a hexagonal grid), visualization and correction of coefficient distribution, constitute important elements of the package, aimed at improving perception of potential lesions and their detection efficacy.