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In this video we will discuss the principle of radiological image formation, on which the modalities used in conventional radiology in a medical imaging department are based. The X-ray beam is gradually attenuated as it passes through the patient. Three events can occur: 1- the X-rays pass through without being affected..... 2- the X-rays are stopped (photoelectric effect) .... 3- the X-rays are deflected, and form the scattered radiation (Compton effect)..... To compensate for this deterioration of the radiant image, an anti-diffusing grid is used. Warning It is not good to have a disclaimer in every video, but that is the way the world is right now. The information in this video is provided for informational and educational purposes only, and can in no way replace the advice of health professionals or be considered or interpreted as advice or a recommendation of any kind. Graphic resources: https://pixabay.com/en/ https://www.pexels.com/en-us/