current density imaging using directly measured harmonic bz data in mreit
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ID: 150956
2013
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Abstract
Magnetic resonance electrical impedance tomography (MREIT) measures magnetic flux density signals through the use of a magnetic resonance imaging (MRI) in order to visualize the internal conductivity and/or current density. Understanding the reconstruction procedure for the internal current density, we directly measure the second derivative of Bz data from the measured k-space data, from which we can avoid a tedious phase unwrapping to obtain the phase signal of Bz. We determine optimal weighting factors to combine the derivatives of magnetic flux density data, ∇2Bz, measured using the multi-echo train. The proposed method reconstructs the internal current density using the relationships between the induced internal current and the measured ∇2Bz data. Results from a phantom experiment demonstrate that the proposed method reduces the scanning time and provides the internal current density, while suppressing the background field inhomogeneity. To implement the real experiment, we use a phantom with a saline solution including a balloon, which excludes other artifacts by any concentration gradient in the phantom.
| Reference Key |
park2013computationalcurrent
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|---|---|
| Authors | ;Chunjae Park;Oh In Kwon |
| Journal | advanced functional materials |
| Year | 2013 |
| DOI |
10.1155/2013/381507
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| URL | |
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