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Objective: To study the capabilities of a procedure for sonotomography (STG) versus that of X-ray mammography (MG) in patients from different age groups who have different radiological types of the breast structure and to estimate the diagnostic possibilities of the STF and X-ray MG procedures in detecting cancer in patients its the X-ray dense background., Materials and Methods: The investigation enrolled 143 patients aged 38 to 77 years who had undergone STG after primary X-ray MG. Particular emphasis was placed on a methodological approach to optimizing STG in patients from different age groups with a varying radiological type of the breast structure in different physiological periods. The international breast imaging and reporting data system was used to standardize detected breast masses., Results: Out of the 143 patients, 102 persons, including 16 patients with verified breast cancer (BC), were found to have space-occupying lesions. During the performed investigation, computed processing of 3D scans at the working station confirmed the entire quadrant-by-consentaneity of the glandular structure of the breast at STG and X-ray MG. There were a higher proportion of abnormal breast masses with increased percentage ratio of glandular tissue in the breast. Emphasis was laid on the role of STG as an additional examination technique in patients from all age groups with the radiologically dense breast in order to detect cancer due to a high sensitivity of 100% and a specificity of 96%., Conclusion: The procedure of STG versus that of X-ray MS showed a high degree of compatibility of opinions as to the type of the breast structure in the patients. Due to the fact that standard-projection STG scans can be compared, during mammography the procedure of STG must hold a firm place in the examination algorithm of the breast in women with its X-ray dense structure.