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  Sensitivity analysis of magnetic field measurements for magnetic resonance electrical impedance tomography (MREIT)

Göksu, C., Scheffler, K., Ehses, P., Hanson, L., & Thielscher, A. (2018). Sensitivity analysis of magnetic field measurements for magnetic resonance electrical impedance tomography (MREIT). Magnetic Resonance in Medicine, 79(2), 748-760. doi:10.1002/mrm.26727.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-7D16-B Version Permalink: http://hdl.handle.net/21.11116/0000-0001-80C4-0
Genre: Journal Article

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Göksu, C, Author              
Scheffler, K1, 2, Author              
Ehses, P1, 2, Author              
Hanson, LG, Author
Thielscher, A1, 2, Author              
Affiliations:
1Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
2Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              

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 Abstract: Purpose Clinical use of magnetic resonance electrical impedance tomography (MREIT) still requires significant sensitivity improvements. Here, the measurement of the current-induced magnetic field (ΔBz,c) is improved using systematic efficiency analyses and optimization of multi-echo spin echo (MESE) and steady-state free precession free induction decay (SSFP-FID) sequences. Theory and Methods Considering T1, T2, and math formula relaxation in the signal-to-noise ratios (SNRs) of the MR magnitude images, the efficiency of MESE and SSFP-FID MREIT experiments, and its dependence on the sequence parameters, are analytically analyzed and simulated. The theoretical results are experimentally validated in a saline-filled homogenous spherical phantom with relaxation parameters similar to brain tissue. Measurement of ΔBz,c is also performed in a cylindrical phantom with saline and chicken meat. Results The efficiency simulations and experimental results are in good agreement. When using optimal parameters, ΔBz,c can be reliably measured in the phantom even at injected current strengths of 1 mA or lower for both sequence types. The importance of using proper crusher gradient selection on the phase evolution in a MESE experiment is also demonstrated. Conclusion The efficiencies observed with the optimized sequence parameters will likely render in-vivo human brain MREIT feasible.

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 Dates: 2018-02
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/mrm.26727
BibTex Citekey: GoksuSEHT2017
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 79 (2) Sequence Number: - Start / End Page: 748 - 760 Identifier: -