The subject of the invention comprises of a method of mapping of distribution of reference physical parameters used in tests applying electromagnetic waves, in particular in planar or spatial tests of objects imagined using a computer tomograph, wherein the entire reference (1) or its fragments of components used in its design and forming determinants of its physical parameters are imaged by high-resolution scanning, that is, at least twice, preferably five times higher than the resolution in which the reference will be used in future studies and a collection of layered images of a reference or its fragment or component is obtained, on the basis of which, by reading information out of the image of the particular cross-section, material distribution and/or absorption coefficient distribution is determined directly, with the information about the absorption coefficient, together with coordinates for every voxel, which form so called spatial distribution of the absorption coefficient for the particular reference element are stored in a three-dimensional matrix, in electronic memory, with said information being used to calculate the correction coefficient, which defines for every voxel the deviation of parameters of the particular part of element of the reference from the theoretical value resulting from manufacturing assumptions, forming so called map of manufacturing precision, individual for the particular fragment or element of the reference, and then the individual manufacturing precision map for a part of the reference or its elements is written into a common file forming the manufacturing precision definition for the entire reference.
