The invention relates to a system (100) for visualizing an image data set comprising a plurality of voxels,using a raycasting method, each voxel ofthe plurality of voxels belonging to at least one class, each class of the at least one class being associated withan intensity redistribution function for computing a redefined voxel value of a voxel from a measured voxel value of said voxel, the system comprising a sampling unit (120) for computing a sample value at a sample location on a projection ray cast from an image pixel, based on a redefined voxel value of at least one voxel proximal to the sample locationon the projection ray, wherein the redefined voxel value of the at least one voxel is computed from a measured voxel value of the at least one voxel,using the intensity redistribution function associated withthe at least one class of the at least one voxel.