Abstract
Objective
Motion-robust multi-slab imaging of hippocampal inner structure in vivo at 7T.
Materials and methods
Motion is a crucial issue for ultra-high resolution imaging, such as can be achieved with 7T MRI. An acquisition protocol was designed for imaging hippocampal inner structure at 7T. It relies on a compromise between anatomical details visibility and robustness to motion. In order to reduce acquisition time and motion artifacts, the full slab covering the hippocampus was split into separate slabs with lower acquisition time. A robust registration approach was implemented to combine the acquired slabs within a final 3D-consistent high-resolution slab covering the whole hippocampus. Evaluation was performed on 50 subjects overall, made of three groups of subjects acquired using three acquisition settings; it focused on three issues: visibility of hippocampal inner structure, robustness to motion artifacts and registration procedure performance.
Results
Overall, T2-weighted acquisitions with interleaved slabs proved robust. Multi-slab registration yielded high quality datasets in 96 % of the subjects, thus compatible with further analyses of hippocampal inner structure.
Conclusion
Multi-slab acquisition and registration setting is efficient for reducing acquisition time and consequently motion artifacts for ultra-high resolution imaging of the inner structure of the hippocampus.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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This work was supported by ANR (project HM-TC, Grant no. ANR-09-EMER-006), France Alzheimer Association (project IRMA7), by the program “Investissements d’avenir” (Grant no. ANR-10-IAIHU-06) and by the CATI project (Fondation Plan Alzheimer).
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Marrakchi-Kacem, L., Vignaud, A., Sein, J. et al. Robust imaging of hippocampal inner structure at 7T: in vivo acquisition protocol and methodological choices. Magn Reson Mater Phy 29, 475–489 (2016). https://doi.org/10.1007/s10334-016-0552-5
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DOI: https://doi.org/10.1007/s10334-016-0552-5