Wednesday, January 23, 2019

Physics of an Mri Machine

The Physics of an magnetic resonance imaging Machine. Whitney Wright PH106/006 Dr. Probst 06/05/2012 The Physics of an magnetic resonance imaging Machine There ar umpteen somatic concepts used in a Magnetic sonority Imaging, also known as MRI, machine. There are many tangible concepts used when an MRI is taken of the body, such as radio waves, sonority and pulse epochs, attractivenessised countrys being produced and lastly, magnets. Radio waves much stronger than the magnetized field of the Earth are sent through the body which causes the nuclei in the body to move to a different position.When the nuclei move back to the get in they originated from, they send back radio waves that the scanner on the machine picks up and turns them into a picture. Resonance is very common within multiple branches of physics, without plangency we wouldnt have television, music or radio. Resonance is also superstar of the most unexplained phenomenons in physics it causes glass to break wi th a high pitched voice, bridges to collapse and also earthquakes causing buildings to collapse.Within the MRI, atomic magnetic resonance is used, this is when magnetic fields and radio waves cause the atoms in the body to give off tiny radio waves (Bellis). The explanation of neural impulse sequences are find outd in a basic way by the article MRI Physics pulse sequences as the pulse sequences define the manner in which the radiofrequency pulses, which generate the detectable signals, and magnetic field gradients, which support the spatial encoding of the signals (Sharma). When the pulse sequences are used a sequence diagram is used to show how the sequences will occur during the MRI.There are many different sequences available each used for creating certain images, the most commonly used is the spin echo sequence. When magnetic fields are produced, it meat an electron has moved along a wire creating a magnetic field around that electron. When the wire is in the form of a loo p, or multiple loops in this case, a very large magnetic field is produced and it runs perpendicular to the field. The magnets within the MRI are known as the uncomplicated magnet and the gradient magnets. The primary magnet or permanent magnet is the coiled wire that creates the magnetic field.These coils have to be stored at -450( Fahrenheit(postnominal) within a type of liquid helium. These magnetic fields are between 10,000 and 30,000 times stronger than the magnetic field of Earth. The gradient magnets consist of threesome smaller magnets within the MRI machine. These magnets are about 1/ railway yard as strong as the primary magnet and allow smaller images of the area to be produced. These magnets help focus on a limited part of the body (Cluett). There are many other physical concepts that I did not discuss used within the MRI machine.The chief(prenominal) concepts are radio waves, resonance, pulse sequences, magnetic fields being produced and magnets. whole works Cited Bellis, Mary. Magnetic Resonance Imaging MRI. About. com, Investors. New York Times Company, n. d. Web. 5 June 2012. . Cluett, Jonathan. MRI What is a MRI?. About. com, Orthopedics. New York Times Company, 15 Aug. 2011. Web. 5 June 2012. . Sharma, Harish, and Jim Lagopoulos. MRI physics pulse sequences. Acta Neuropsychiatrica22. 2 (2010) 90. EBSCOhost. Web. 5 June 2012. .

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