Abstract
Purpose
Diffusion tensor imaging (DTI) is increasingly being used in magnetic resonance neurography (MRN). The purpose of this study was to determine the interreader and test-retest reliability of peripheral nerve DTI in MRN with focus on the sciatic nerve.
Methods
In this prospective study 27 healthy volunteers each underwent 3 scans of a short DTI protocol on separate days consisting of a T2-weighted turbo spin-echo and single-shot DTI sequence of the sciatic nerve of the dominant leg. The DTI parameters fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD), and radial diffusivity (RD) were obtained after manual nerve segmentation by two independent readers. Intraclass correlation coefficients (ICC), standard error of measurement (SEM), and Bland-Altman plots were calculated as measures for both interreader and test-retest agreement for all readout parameters.
Results
The mean ± standard deviation was 0.507 ± 0.05 for FA, 1308.5 ± 162.4 × 10−6 mm2/s for MD, 905.6 ± 145.4 ×10−6 mm2/s for RD and 2114.1 ± 219.2 × 10−6 mm2/s for AD. The SEM for FA was 0.02 for interreader and test-retest agreement, the SEM for MD, RD, and AD ranged between 46.2 × 10−6 mm2/s (RD) and 70.1 × 10−6 mm2/s (AD) for interreader reliability and between 45.9 × 10−6 mm2/s (RD) and 70.1 × 10−6 mm2/s (AD) for test-retest reliability. The ICC for interreader reliability of DTI parameters ranged between 0.81 and 0.92 and ICC for test-retest reliability between 0.76 and 0.91.
Conclusion
Peripheral nerve DTI of the sciatic nerve is reliable and reproducible. The measures presented here may serve as first orientation values of measurement accuracy when interpreting parameters of sciatic nerve DTI.
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Abbreviations
- AD:
-
Axial diffusivity
- DTI:
-
Diffusion tensor imaging
- FA:
-
Fractional anisotropy
- ICC:
-
Intra-class correlation coefficient
- MD:
-
Mean diffusivity
- MRN:
-
Magnetic resonance neurography
- RD:
-
Radial diffusivity
- SEM:
-
Standard error of measurement
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Supported in part by the German Research Council (SFB 1118, S.H.; SFB 1158, M.B.).
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F. Preisner, P. Bäumer, M. Wehrstein, B. Friedmann-Bette, M. Hackbusch, S. Heiland, M. Bendszus and M. Kronlage declare that they have no competing interests.
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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 1975 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.
Caption Electronic Supplementary Material
Supplementary Fig. 1
Descriptive statistics for both readers visualized as scattered dot plots to show the full distribution of values. Median and quartiles are presented by lines.
Supplementary Fig. 2–4
Bland-Altman plots for assessment of test-retest reliability of mean diffusivity (MD), radial diffusivity (RD) and axial diffusivity (AD) values for both observers and all three scans, respectively. Plots as typically illustrated with single values for bias (grey line) as well as for upper and lower limits of agreement (dotted lines)
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Preisner, F., Bäumer, P., Wehrstein, M. et al. Peripheral Nerve Diffusion Tensor Imaging. Clin Neuroradiol 30, 679–689 (2020). https://doi.org/10.1007/s00062-019-00859-0
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DOI: https://doi.org/10.1007/s00062-019-00859-0