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 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.
Mechanical Engineering Department, Imperial College London, UK.
César A F
CA
Montesinos
Zion T H
ZT
Tse
Yum J
YJ
Chan
Haytham
H
Elhawary
Marc
M
Rea
Abbi
A
Hamed
Ian
I
Young
Michael
M
Lamperth
D016477:Artifacts; D003198:Computer Simulation; D020342:Finite Element Analysis; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D060526:Magnetic Fields; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008670:Metals; D008962:Models, Theoretical; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*
D008670:Metals