Quality criteria and quality control in mammography

In mammography, technical testing of the radiographic system is but a necessary basic step of radiological physics within a multi-step quality assurance concept. The principle of 'concretion' (random-sample mammography) for quality assurance needs to be supplemented by the principle of 'abstraction' (physical measurement), none the least for reasons of dose measurement. A radiological physics measurement facility within such a field study allows a survey of the present-day state of efficiency in mammography technology and a definition of standard values for radiation quality, effective picture contrast, resolution capacity and dose. Equipment-related defects often remain undetected by the user since he/she does not avail of a comparison with average values: this clearly indicates the need for standardization. The combination of several equipment - related defects results in diagnostic consequences since X-ray - morphological malignity criteria cannot be detected in qualitatively insufficienc mammogramms any longer. A quality assurance programme applicable to both mammography and radiology in general will be welcomed and accepted as a useful technical aid for orientation. (orig./MG)