On the basis of the work we devoted to susceptibility and radio-frequency artifacts,  we have developped a matlab program that simulates both the susceptibility and the eddy current artifacts in the case of a metallic implant with spherical shape (for such geometry, analytical expressions for the induced RF and static magnetic fields are known). These two kinds of artifact add to the MRI image without our knowing of the contribution of each one to the image distortion. Our program enables to hide one of the two artifacts and image the other or image the effects of the two artifacts together. It is then possible to compare for different materials the importance of each source of image distorsion.

Details on the mathematical modeling from where the matlab program originates can be obtained in the following articles :

• Mathematical modeling and numerical simulation of magnetic susceptibility artifacts in Magnetic Resonance Imaging
  
S. Balac and G. Caloz
Computer Methods in Biomechanics and Biomedical Engineering (3:335-349 (2000))

• Fast approximate solution of Bloch equation for simulation of  RF artifacts in Magnetic Resonance Imaging
  S. Balac and  L. Chupin
  Mathematical and Computer Modelling (48 : 1901-1913 (2008))

To download the source code :

• artef.m : main program
• relax.m
• solvebloch.m
• voxel.m
• fndrc.m
• polnom.m
• F.m
• calBdB.m
• calBRF.m

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