Abstract
Purpose
To compare the influence of two different regions of interest (ROIs) on diffusion tensor metrics in dystrophic thigh muscles using a custom-made (whole muscle) ROI including and a selective ROI excluding areas of fatty replacement.
Methods
Diffusion tensor imaging (DTI) and chemical-shift-encoded water-fat magnetic resonance imaging (MRI) of the thigh was conducted on a 3-Tesla system in 15 cases with muscular dystrophy and controls. The ROIs were chosen according to patterns of fatty replacement on co-registered axial DTI and gradient echo sequence (GRE) images. Fractional anisotropy (FA), apparent diffusion coefficient (ADC), fiber track length (FTL), and muscle fat fractions (MFF) were compared between both ROI segmentations. These comparisons, muscle-specific correlation coefficients, and the influence of ROI localization on tensor metrics were derived based on linear mixed effects regression models.
Results
In the cases a high correlation was observed for ADC and FA with MFF using a custom ROI. The correlation was weaker but still significant with a selective ROI method. Using the custom ROI, FTL correlated significantly with MFF in 3 out of 4 muscles (r ≤ −0.51). A correlation was not found for the selective ROI method. Interaction analysis revealed that the association of ADC and FA with MFF was not significantly influenced by the ROI localization. For FTL the ROI localization significantly reduced the negative association with MFF.
Conclusion
The DTI metrics and FTL of custom ROI segmentation are significantly influenced by MFF. Contrary to ADC and FA, the effect of MFF on FTL is significantly reduced when applying selective ROI segmentation, which could therefore be a better option for MR tractography.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- BF:
-
Biceps femoris muscle
- DTI:
-
Diffusion tensor imaging
- EPI:
-
Echo planar imaging
- FA:
-
Fractional anisotropy
- FTL:
-
Fiber track length
- G:
-
Gracilis muscle
- GRE:
-
Gradient echo sequence
- MFF:
-
Muscle fat fraction
- NSA:
-
Number of signal averages
- RF:
-
Rectus femoris muscle
- ROI:
-
Region of interest
- SNR:
-
Signal-to-noise ratio
- ST:
-
Semitendinosus muscle
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Acknowledgements
We kindly thank Dr. Jan Sedlacik (Department of Neuroradiology, University Medical Center Hamburg-Eppendorf) for the critical review of this work.
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S. Keller, Z.J. Wang, A. Aigner, A.C. Kim, A. Golsari, G. Adam and J. Yamamura declare that they have no competing interests. H. Kooijman is an employee of Philips Healthcare.
Caption Electronic Supplementary Material
Supplement Table 1.
Pearson correlation coefficientsa of ADC, FA, FTL, MFF, and demographics in cases and controls (aBased on mixed effects models with random intercepts for person)
Supplement Table 2:
Standard deviation of three technical replicate regions-of-interest used for the custom and selective ROI method in cases
Supplement Table 3.
Correlation analysis of custom and selective ROI DTI metrics and FTL
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Keller, S., Wang, Z.J., Aigner, A. et al. Diffusion Tensor Imaging of Dystrophic Skeletal Muscle. Clin Neuroradiol 29, 231–242 (2019). https://doi.org/10.1007/s00062-018-0667-3
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DOI: https://doi.org/10.1007/s00062-018-0667-3