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Magnetic Resonance Imaging technology - Research Paper Example

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Magnetic Resonance Imaging Technology Name:  Institution:       Magnetic Resonance Imaging Technology Introduction Magnetic resonance imaging (MRI) technology is a type of medical imaging technique, which is applied in radiology-based visualization of internal anatomic structures and physiologic processes (U.S…
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Magnetic Resonance Imaging technology

Download file to see previous pages... MRI technology harnesses this magnetic spin in ionic hydrogen within the body to develop MRI imaging by an MRI scanner. The MRI scanner is machine made of powerful and large magnets, which are used to align the atomic nuclei through magnetization. Thereafter, radio frequency fields are used to form the alignment of magnetized nuclei in a systematic manner. The application of radio frequency makes the nuclei develop magnetic fields that rotate and are detectable (Hendee & Christopher, 1984). The detected fields produce information, which is recorded and used in the development of the image of the scanned part of the body. The gradients of different magnetic fields make nuclei in different imaged locations to precess with differing speed, and this allows the recovery of spatial information through Fourier analysis of the detected signals. The use of gradients in differing directions allows the acquisition of 3D and 2D volumes in all arbitrary orientations (Hendee & Christopher, 1984). The ability of MRI imaging to offer good contrasting between tissues of different organs makes it an appropriate imaging technique for soft tissues in organs such as the heart and brain as well as muscles. MRI Working Mechanism MRI scanners rely on the magnetic properties of the ions in the body and their ability to align along strong magnetic fields to develop detectable signals that can be converted into images. The human tissues contain water, which has hydrogen nuclei, which can easily align according to the magnetic field of the scanner. The water molecules have two protons or hydrogen nuclei, and when a person is placed within the scanner’s magnetic field the magnetic moment of the nuclei align along the magnetic fields (Thulborn et al., 1982). During carrying out the scanning process radio frequency is used to produce a varying field of electromagnetism. The generated field of electromagnetism has frequency that is at a resonance frequency, which is absorbed and also causes a flip in the spin of the protons in the field of electromagnetism. After turning off the field of electromagnetism generated, the spins of nuclei that had aligned to the magnetic field return to their original thermodynamic equilibrium (Hendee & Christopher, 1984). In the process the bulk magnetization undergoes re-alignment with the static field of electromagnetism. In this process a radio frequency signal is developed, which is measurable by receiver coils. In order to acquire three-dimensional images additional magnetic fields are applied during scanning so as to learn the origin of particular signals in 3-dimensional space (Wu et al., 1999). The applied additional fields are used to generate signals that can be detected from specific parts of the scanned body. The spatial excitation helps in generating 3-dimensional images. The applied additional magnetic fields could also make the magnetization generated to precess at differing frequencies at particular scanned locations (Thulborn et al., 1982). This allows acquisition of k-space encoding that offers spatial information about the scanned part of the body. The 3-dimensional images acquired can be rotated in different orientations, and the manipulations can enable the detection of structural changes in the body. The different magnetic ...Download file to see next pagesRead More
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