Finite-element analysis for magnetic resonance image artifact evaluation

The static magnetic field of a magnetic resonance imaging scanner can be distorted by the presence of materials, perturbing the spatial encoding process in magnetic resonance imaging and often resulting in image artifacts. The relationship between the image artifact size and magnetic susceptibility...

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Bibliographic Details
Published in:	Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine Vol. 226; no. 1; p. 49
Main Authors:	Montesinos, César A F, Tse, Zion T H, Chan, Yum J, Elhawary, Haytham, Rea, Marc, Hamed, Abbi, Young, Ian, Lamperth, Michael
Format:	Journal Article
Language:	English
Published:	England 01-01-2012
Subjects:	Computer Simulation Finite Element Analysis Image Interpretation, Computer-Assisted - methods Magnetic Fields Magnetic Resonance Imaging - methods Metals Models, Theoretical Radiation Dosage Radiometry - methods
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Summary:	The static magnetic field of a magnetic resonance imaging scanner can be distorted by the presence of materials, perturbing the spatial encoding process in magnetic resonance imaging and often resulting in image artifacts. The relationship between the image artifact size and magnetic susceptibility of the material specimen is of interest to engineers for the design of devices that are to be compatible with the imaging volume of the scanner. In this study, a finite-element method was used to simulate the distorted magnetic field of samples with different susceptibilities. With the knowledge of the external- and self- magnetic field interactions, a Lorentz correction was applied to compute the magnetic field deviation. The simulated results were then validated by the corresponding experimental magnetic resonance images.
ISSN:	0954-4119
DOI:	10.1177/0954411911427506