Introduction: Filtration is a process of shaping the strength of the output beam of X-rays in which the purpose is to increase the proportion of photons that are useful fot the formation of X-ray images and reduce the proportion of photons that increase the patients dose. In radiology the beam is filtered on two levels, with its own and with additional filtration. Purpose: The purpose of the thesis was to investigate the use of filtration and various filters and their impact on X-rays. Methods: A descriptive method of work with a systematic review of the literature was used to write the diploma thesis. We searched for the mentioned articles in Slovenian and English language on various databases in the period from November 2021 to March 2022. Results: We presented the findings of the articles we used in a systematic review of the literature. The emphasis was on the types of filtration and its impact on X-rays and on the dose for the patient, as well as the impact on image quality. As a curiosity we mention a posibility of graphite being a possible X-ray beam filter. Discussion and conclusion: We have found out that consistent use of filtration lowers the patient’s dose without significantly impairing image quality, so the use of filtration in radiology is important. We have learned from the literature that the best filtration is a combination of both filters, aluminum and copper.
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