Reconstruction of current density distributions in axially symmetric cylindrical sections using one component of magnetic flux density: computer simulation study.
In magnetic resonance current density imaging (MRCDI), we inject current into a subject through surface electrodes and measure the induced magnetic flux density B inside the subject using an MRI scanner. Once we have obtained all three components of B, we can reconstruct the internal current density distribution J = inverted triangle x B/mu0). This technique, however, requires subject rotation since the MRI scanner can measure only one component of B that is parallel to the direction of its main magnetic field. In this paper, under the assumption that the out-of-plane current density Jz is negligible in an imaging slice belonging to the xy-plane, we developed an imaging technique of current density distributions using only Bz, the z-component of B. The technique described in this paper does not require a subject rotation but the quality of reconstructed images depends on the amount of out-of-plane current density Jz. From numerical simulations, we found that the new algorithm could be applied to subjects such as human limbs using longitudinal electrodes.
Seo
Jin Keun
JK
Department of Mathematics, Yonsei University, Korea.
Kwon
Ohin
O
Lee
Byung Il
BI
Woo
Eung Je
EJ
D000465:Algorithms; D003198:Computer Simulation; D004566:Electrodes; D005121:Extremities; D006801:Humans; D008280:Magnetics; D008954:Models, Biological