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Neuroradiology

, Volume 59, Issue 4, pp 403–409 | Cite as

MR imaging differentiation of Fe2+ and Fe3+ based on relaxation and magnetic susceptibility properties

  • Olaf Dietrich
  • Johannes Levin
  • Seyed-Ahmad Ahmadi
  • Annika Plate
  • Maximilian F. Reiser
  • Kai Bötzel
  • Armin Giese
  • Birgit Ertl-Wagner
Functional Neuroradiology

Abstract

Purpose

The aim of this study is to evaluate the MR imaging behavior of ferrous (Fe2+) and ferric (Fe3+) iron ions in order to develop a noninvasive technique to quantitatively differentiate between both forms of iron.

Methods

MRI was performed at 3 T in a phantom consisting of 21 samples with different concentrations of ferrous and ferric chloride solutions (between 0 and 10 mmol/L). A multi-echo spoiled gradient-echo pulse sequence with eight echoes was used for both T 2* and quantitative susceptibility measurements. The transverse relaxation rate, R 2* = 1/T 2*, was determined by nonlinear exponential fitting based on the mean signals in each sample. The susceptibilities, χ, of the samples were calculated after phase unwrapping and background field removal by fitting the spatial convolution of a unit dipole response to the measured internal field map. Relaxation rate changes, ΔR 2*(c Fe), and susceptibility changes, Δχ(c Fe), their linear slopes, as well as the ratios ΔR 2*(c Fe) / Δχ(c Fe) were determined for all concentrations.

Results

The linear slopes of the relaxation rate were (12.5 ± 0.4) s−1/(mmol/L) for Fe3+ and (0.77 ± 0.09) s−1/(mmol/L) for Fe2+ (significantly different, z test P < 0.0001). The linear slopes of the susceptibility were (0.088 ± 0.003) ppm/(mmol/L) for Fe3+ and (0.079 ± 0.006) ppm/(mmol/L) for Fe2+. The individual ratios ΔR 2*/Δχ were greater than 40 s−1/ppm for all samples with ferric solution and lower than 20 s−1/ppm for all but one of the samples with ferrous solution.

Conclusion

Ferrous and ferric iron ions show significantly different relaxation behaviors in MRI but similar susceptibility patterns. These properties can be used to differentiate ferrous and ferric samples.

Keywords

Magnetic resonance imaging Iron Ferric and ferrous chloride Relaxation Magnetic susceptibility 

Notes

Compliance with ethical standards

Funding

This study was partly funded by the Lüneburg Heritage and Deutsche Forschungsgesellschaft (DFG) Grant BO 1895/4-1 to KB.

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors. For this type of study, formal consent is not required.

Informed consent

Statement of informed consent was not applicable since the manuscript does not contain any patient data.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Josef Lissner Laboratory for Biomedical Imaging, Institute for Clinical RadiologyLudwig-Maximilians-University Hospital MunichMunichGermany
  2. 2.Department of NeurologyLudwig-Maximilians-University Hospital MunichMunichGermany
  3. 3.German Center for Neurodegenerative Diseases (DZNE)MunichGermany
  4. 4.Institute for Clinical RadiologyLudwig-Maximilians-University Hospital MunichMunichGermany
  5. 5.Center for Neuropathology and Prion ResearchLudwig-Maximilians-University MunichMunichGermany

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