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7 Tesla quantitative hip MRI: a comparison between TESS and CPMG for T2 mapping

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Abstract

Objectives

We aimed to evaluate the feasibility of triple-echo steady state (TESS) T2 mapping as an alternative to conventional multi-echo-spin-echo (CPMG) T2 mapping for the quantitative assessment of hip joint cartilage at 7 T.

Materials and methods

A total of eight healthy volunteers and three patients were included. Reproducibility of both techniques was evaluated in five volunteers in five scans each. T2 relaxation times were measured by manually drawing regions of interest in multiple regions of the hip joint. Data from both methods were compared using Pearson correlation coefficient, intra-class correlation coefficient, and coefficient of repeatability. The overall image quality and presence of artifacts was assessed.

Results

Cartilage transplant and surrounding fluid were well depicted by both methods. Compared to CPMG, TESS provided systematically reduced T2 values (43.3 ± 7.3 vs. 19.2 ± 5.5 ms for acetabular cartilage, and 41.4 ± 5.6 vs. 21.7 ± 5.2 ms for femoral cartilage), in line with previously reported values. No correlation between both methods was found. TESS yielded a slightly better reproducibility than CPMG, while CPMG showed pronounced sensitivity to B1 inhomogeneities.

Conclusion

TESS seems to be an attractive alternative to CPMG for improvements in quantitative hip joint imaging at 7 T, allowing shortening of the total acquisition time paired with insensitivity to B1, while rendering comparable image quality with good repeatability.

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Acknowledgments

This work was supported by a research grant (IFORES) of the University Hospital Essen, Germany.

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Authors and Affiliations

  1. Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Kokereiallee 7, Building C84, 45141, Essen, Germany

    Oliver Kraff, Andrea Lazik-Palm & Harald H. Quick

  2. Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, University Duisburg-Essen, Essen, Germany

    Andrea Lazik-Palm & Jens M. Theysohn

  3. Division of Radiological Physics, Department of Radiology, University of Basel Hospital, Basel, Switzerland

    Rahel Heule & Oliver Bieri

  4. Department of Biomedical Engineering, University of Basel, Basel, Switzerland

    Rahel Heule & Oliver Bieri

  5. High Field and Hybrid MR Imaging, University Hospital Essen, University Duisburg-Essen, Essen, Germany

    Harald H. Quick

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  1. Oliver Kraff
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  2. Andrea Lazik-Palm
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  3. Rahel Heule
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  4. Jens M. Theysohn
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  5. Oliver Bieri
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Correspondence to Oliver Kraff.

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The authors declare that they have no conflict of interest.

Ethical standard

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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Informed consent was obtained from all individual participants included in the study.

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Kraff, O., Lazik-Palm, A., Heule, R. et al. 7 Tesla quantitative hip MRI: a comparison between TESS and CPMG for T2 mapping. Magn Reson Mater Phy 29, 503–512 (2016). https://doi.org/10.1007/s10334-016-0557-0

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  • DOI: https://doi.org/10.1007/s10334-016-0557-0

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