Abstract
Introduction
Dermatomyositis (DM) is an idiopathic inflammatory myopathy involving severe debilitation in need of diagnostics. We evaluated the proximal lower extremity musculature with diffusion tensor imaging (DTI), intravoxel incoherent motion (IVIM) and dynamic DTI in DM patients and controls and compared with standard clinical workup.
Methods
In this IRB-approved, HIPAA-compliant study with written informed consent, anatomical, Dixon fat/water and diffusion imaging were collected in bilateral thigh MRI of 22 controls and 27 DM patients in a 3T scanner. Compartments were scored on T1/T2 scales. Single voxel dynamic DTI metrics in quadriceps before and after 3-min leg exercise were measured. Spearman rank correlation and mixed model analysis of variance/covariance (ANOVA/ANCOVA) were used to correlate with T1 and T2 scores and to compare patients with controls.
Results
DM patients showed significantly lower pseudo-diffusion and volume in quadriceps than controls. All subjects showed significant correlation between T1 score and signal-weighted fat fraction; tissue diffusion and pseudo-diffusion varied significantly with T1 and T2 score in patients. Radial and mean diffusion exercise response in patients was significantly higher than controls.
Conclusion
Static and dynamic diffusion imaging metrics show correlation with conventional imaging scores, reveal spatial heterogeneity, and provide means to differentiate dermatomyositis patients from controls.
Key Points
• Diffusion imaging shows regional differences between thigh muscles of dermatomyositis patients and controls.
• Signal-weighted fat fraction and diffusion metrics correlate with T1/T2 scores of disease severity.
• Dermatomyositis patients show significantly higher radial diffusion exercise response than controls.
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Change history
09 July 2018
The original version of this article, published on 04 June 2018, unfortunately contained a mistake.
Abbreviations
- AD:
-
Adductor magnus
- ANCOVA:
-
Analysis of covariance
- ANOVA:
-
Analysis of variance
- BF:
-
Biceps femoris
- CK:
-
Creatine kinase
- DM:
-
Dermatomyositis
- DTI:
-
Diffusion tensor imaging
- DWI:
-
Diffusion-weighted imaging
- ECG:
-
Electrocardiogram
- FA:
-
Fractional anisotropy
- GRE:
-
Gradient echo
- IVIM:
-
Intravoxel incoherent motion
- MD:
-
Mean diffusivity
- MMT:
-
Manual muscle test
- PC:
-
Phase contrast
- RF:
-
Rectus femoris
- ROI:
-
Region of interest
- SM:
-
Semimembranosus
- SPAIR:
-
Spectral adiabatic inversion recovery
- ST:
-
Semitendinosus
- SV-MEDITATE:
-
Single voxel multiple echo diffusion tensor acquisition technique
- SWFF:
-
Signal-weighted fat fraction
- TSE:
-
Turbo spin echo
- VI:
-
Vastus intermedius
- VL:
-
Vastus lateralis
- VM:
-
Vastus medialis
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The scientific guarantor of this publication is Eric E. Sigmund, PhD.
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The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
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One of the authors (J.S. Babb) has significant statistical expertise.
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Written informed consent was obtained from all subjects (patients) in this study.
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Institutional Review Board approval was obtained.
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• prospective
• cross-sectional study
• performed at one institution
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The original version of this article was revised: The name of A.G. Franks was presented incorrectly and one of his affiliations was missing.
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Sigmund, E.E., Baete, S.H., Luo, T. et al. MRI assessment of the thigh musculature in dermatomyositis and healthy subjects using diffusion tensor imaging, intravoxel incoherent motion and dynamic DTI. Eur Radiol 28, 5304–5315 (2018). https://doi.org/10.1007/s00330-018-5458-3
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DOI: https://doi.org/10.1007/s00330-018-5458-3