The Visual Representation of a Body Part in Imaging Technology

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Imaging technology is the visual representation of a body part, such as an organ, for the purpose of a medical diagnosis. Nowadays, technologies such as X-Rays, Magnetic Resonance Imaging (MRI) and ultrasound are used everyday for medical analysis. X-Rays are very useful because they can penetrate through different materials to give an image of the interior of the body. MRI use strong magnets to create an image of a body part, while ultrasound imaging uses sound waves. Bone, muscle and fat absorb x-rays at different levels, so the screen lets see different structures of the body because the different levels of exposure are in different shades of gray. The main component of an x-ray machine is a vacuum tube with a cathode or filaments and an anode, which is usually made of tungsten, a hard-steel gray metal used to make electric light filaments. Electric current passes through the filament, raising its temperature. Once it reaches a certain level of energy, the filament starts emitting negatively charged electrons. These electrons are attracted with great force from the positively tungsten anode, taking them through the vacuum tube at very high speed. In one of the atom’s lower orbital an electron gets knocked away when the anode collides with electrons. An electron from the higher orbital takes place of the removed electron, releasing energy as an X-ray photon. (HowStuffWorks-X-Rays) Called ‘bremsstrahlung’, the reaction contains x-rays of varying wavelengths. The X-ray
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