Abstract
Purpose
To quantify small amounts of iron-labeled cells in mouse brains with magnetic resonance imaging (MRI).
Procedures
Iron-labeled cells (from 500 to 7,500) were stereotaxically transplanted into the brain of living mice that were subsequently imaged with MRI at 4.7 T. We compared four quantitative methods: (1) T2 relaxometry, (2) T2* relaxometry, (3) the volume of the cloverleaf hypointense artifact generated on T2*-weighted images, and (4) the volume of the cloverleaf hyperintense artifact generated on positive contrast images.
Results
The methods based on relaxometry, whether T2 or T2*, did not correlate with the number of injected cells. By contrast, those based on measurement of cloverleaf artifact volume, whether using negative or positive enhancement, showed a significant linear relationship for the given range of cells (R [0.92–0.95], p < 0.05).
Conclusions
T2* artifact volume imaging (negative or positive) appears promising for the quantification of magnetically labeled cells following focal injection in the brain.
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Acknowledgments
This work was supported by a grant from the ANR TecSan (INFLAM). The authors thank Christine Ménager of CNRS UMR 7612 (Paris, France) for kindly providing the AMNP contrast agent and Loic Boussel of CNRS UMR 5220 for his help with statistics.
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The authors declare that they have no conflict of interest.
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Brisset, JC., Sigovan, M., Chauveau, F. et al. Quantification of Iron-Labeled Cells with Positive Contrast in Mouse Brains. Mol Imaging Biol 13, 672–678 (2011). https://doi.org/10.1007/s11307-010-0402-1
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DOI: https://doi.org/10.1007/s11307-010-0402-1