MRI
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Medical imaging allows medical professionals to produce visual images of internal organs, tissues, and to map biological functions in humans. There are many kinds of medical imagining techniques, including Computered Tomography (CT), Computered Axial Tomography (CAT), Positron Emission Tomography (PET) and Digital Subtraction Angiography (DSA). One of the most common and popular among the medical community is Magnetic Resonance Imagining (MRI). MRI is not effective with bone problems or functions where there is rapid bodily action, but it continues to gain in popularity as new and more efficient techniques for using it are developed “Magnetic resonance imaging has been used clinically for about 15 years, but its technology has advanced enormously since its introduction in the early 1980s. Today, there are an estimated 4,000 MRI systems worldwide, and the technique is used to provide diagnostic images of almost every region of the human body. Its technology continues to expand, with MRI manufacturers focusing on new techniques” (Thomas 1). MRI technology works based on two populations of hydrogen protons, one of them free and the other bound. MRI technology makes use of very powerful helium-cooled superconductive magnets. Using electromagnetic waves far below the frequency of X-rays, images are created by computerized analysis of the magnetically aligned, radio-deflected hydrogen atoms in the body. The fr
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of operating a powerful magnet, the most obvious of these, ferromagnetic attraction” (Baker and DeVos 1). Any ferromagnetic based object that enters the magnetic field of the MRI scanner will be turned into a dangerous projectile immediately. Many MRI scanning rooms have a metal detector at the entrance to prevent ferromagnetic based objects from inadvertently entering the room.
Some MRI scanners come equipped with additional shielding which lessens the magnetic field outside of the actual scanning region. Because of these shields, the magnetic field is more constrained external to the scanning field but this creates an increased intensity in the actual scanning field itself. What this means is that the radiologist has even less time to react if something accidentally gets pulled into the magnetic field. Location of the magnetic force lines around the scanner is very important because anything pulled into the field will be quickly driven into the bore of the scanner. Of course, the strength of the magnetic field varies depending on the distance away from the magnet. The bore of the scanner has the strongest magnetic field, which weakens as distance from it increases. The rate it weakens depends on the amount of shieldi
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Some common words found in the essay are:
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Approximate Word count = 1846
Approximate Pages = 7 (250 words per page)
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