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Progress In Electromagnetics Research
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MAGNETIC FIELD IN MRI YOKELESS DEVICES: ANALYTICAL APPROACH

By R. Ravaud and G. Lemarquand

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Abstract:
This paper presents a three-dimensional analytical expressions for studying the static magnetic field produced by Magnetic Resonance Imaging structures. This medical imaging technique uses a very high and uniform magnetic field produced by ring permanent magnets with rotating polarizations. However, the manufacturing of such ring permanent magnets is difficult to realize. Consequently, such ring permanent magnets are replaced by assemblies of tile permanent magnets uniformly magnetized. Unfortunately, the magnetic field produced by these tile permanent magnets uniformly magnetized is both less important and less uniform than the one produced by an idealized ring permanent magnet. We propose in this paper to study the influence of the number of tile permanent magnets used on the magnetic field properties.

Citation:
R. Ravaud and G. Lemarquand, " magnetic field in MRI yokeless devices : analytical approach ," Progress In Electromagnetics Research, Vol. 94, 327-341, 2009.
doi:10.2528/PIER09061205
http://www.jpier.org/PIER/pier.php?paper=09061205

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