Abstract
Objective
To confirm feasibility and assess intravoxel incoherent motion (IVIM) to differentiate active sacroiliitis and ankylosing spondylitis..
Methods
Forty-one patients were divided into two groups, an active group (n = 20) and a chronic group (n = 21), according to the Bath Ankylosing Spondylitis (AS) Disease Activity Index (BASDAI) and laboratory parameters. In addition, 21 healthy volunteers were chosen as the control group. Tissue diffusivity (Dslow), perfusion fraction (f), and pseudo-diffusion coefficient (Dfast) values were obtained for all three groups. One-way analysis of variance and receiver operating characteristic analysis were performed for all parameters.
Results
There was good interobserver agreement on the measurements between the two observers. The optimal cut-off values (with respective AUC, sensitivity, specificity, positive likelihood ratio, and negative likelihood ratio) between active and chronic groups were Dslow = 0.53 × 10−3 mm2/s (0.976, 90 %, 95.2 %, 18.9, 0.10) and f = 0.09 (0.545, 20 %, 95.5 %, 4.2, 0.84), and between chronic and control groups were Dslow = 0.22 × 10−3 mm2/s (0.517, 9.52 %, 100 %, no number, 0.9) and f = 0.09 (0.935, 95.24 %, 80.95 %, 5, 0.059).
Conclusion
Dslow and f of IVIM diffusion-weighted (DW)-MRI in AS show a significant difference in the values of diffusion of water molecules and fractional perfusion-related volume among the three groups.
Key Points
• D slow can be used to differentiate the activity of AS.
• With perfusion fraction, the sensitivity of differentiating the AS activity is improved.
• IVIM DWI plays an important role in detecting the activity in patients with AS.
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Abbreviations
- AS:
-
Ankylosing spondylitis
- AUC:
-
Area under the curve
- Dslow :
-
Pure diffusion
- Dfast :
-
Pseudo diffusion coefficient
- F:
-
Perfusion fraction
- DWI:
-
Diffusion-weighted imaging
- ADC:
-
Apparent diffusion coefficient
- IVIM:
-
Intravoxel incoherent motion
- ROC:
-
Receiver operating characteristic
- ROI:
-
Region of interest
- SDS:
-
Standard deviation
- SNR:
-
Signal-to-noise ratio
- DCE-MRI:
-
Dynamic contrast-enhanced MR imaging
- SPIR:
-
Spectral presaturation inversion recovery
- PDW-SPAIR:
-
Proton density-weighted spectral presaturation attenuated inversion recovery
- STIR:
-
Short tau inversion recovery
- TR/TE:
-
Repetition time/echo
- TSE:
-
Turbo spin echo
- FSE:
-
Fast spin echo
- FS:
-
Fat suppression
- ESR:
-
Erythrocyte sedimentation rate
- CRP:
-
C-reactive protein
- MRI:
-
Magnetic resonance imaging
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Acknowledgements
The scientific guarantor of this publication is Changhong Liang. 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. This study has received funding by the National Scientific Foundation of China (No. 81271569, U1301258 and 81271654) and the Medical Scientific Foundation of Guangzhou city, Guangdong Province, China (No. 20121A011181). One of the authors has significant statistical expertise. Institutional review board approval was obtained. Written informed consent was obtained from all subjects (patients) in this study. Methodology: prospective, case-control study, multicenter study.
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Ying-hua Zhao and Shao-lin Li contributed equally to this article.
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Zhao, Yh., Li, Sl., Liu, Zy. et al. Detection of Active Sacroiliitis with Ankylosing Spondylitis through Intravoxel Incoherent Motion Diffusion-Weighted MR Imaging. Eur Radiol 25, 2754–2763 (2015). https://doi.org/10.1007/s00330-015-3634-2
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DOI: https://doi.org/10.1007/s00330-015-3634-2