Directive 97/43/Euratom provides general principles regarding health protection of individuals against the dangers of ionizing radiation in relation to medical exposure, following medical diagnosis or treatment. Medical exposure shall be justified in advance. All doses due to medical exposure for radiological purposes shall be kept as low as reasonably achievable consistent with obtaining the required diagnostic information. Written protocols for every type of standard radiological practice shall be established for each equipment. Practitioners must have adequate theoretical and practical training. Measures must be taken with a view to avoiding unnecessary proliferation of radiological equipment. All radiological equipment in use is kept under strict surveillance regarding radiation protection and an up-to-date inventory of radiological equipment for each radiological installation must be available to the competent authorities. All necessary measures must be taken in order to reduce the probability and the magnitude of accidental or unintended doses of patients from radiological practices.