Abstract
Objective
To validate a radial imaging spin-echo diffusion tensor (RAISED) sequence for high-resolution diffusion tensor imaging (DTI) of articular cartilage at 3 T.
Methods
The RAISED sequence implementation is described, including the used non-linear motion correction algorithm. The robustness to eddy currents was tested on phantoms, and accuracy of measurement was assessed with measurements of temperature-dependent diffusion of free water. Motion correction was validated by comparing RAISED with single-shot diffusion-weighted echo-planar imaging (EPI) measures. DTI was acquired in asymptomatic subjects (n = 6) and subjects with doubtful (Kellgren-Lawrence [KL] grade 1, n = 9) and mild (KL = 2, n = 9) symptomatic knee osteoarthritis (OA). MD and FA values without correction, and after all corrections, were calculated. A test-retest evaluation of the DTI acquisition on three asymptomatic and three OA subjects was also performed.
Results
The root mean squared coefficient of variation of the global test-restest reproducibility was 3.54% for MD and 5.34% for FA. MD was significantly increased in both femoral condyles (7–9%) of KL 1 and in the medial (11–17%) and lateral (10–12%) compartments of KL 2 subjects. Averaged FA presented a trend of lower values with increasing KL grade, which was significant for the medial femoral condyle (-11%) of KL 1 and all three compartments in KL 2 subjects (-18 to -11%). Group differences in MD and FA were only significant after motion correction.
Conclusion
The RAISED sequence with the proposed reconstruction framework provides reproducible assessment of DTI parameters in vivo at 3 T and potentially the early stages of the disease in large regions of interest.
Key Points
• DTI of articular cartilage is feasible at 3T with a multi-shot RAISED sequence with non-linear motion correction.
• RAISED sequence allows estimation of the diffusion indices MD and FA with test-retest errors below 4% (MD) and 6% (FA).
• RAISED-based measurement of DTI of articular cartilage with non-linear motion correction holds potential to differentiate healthy from OA subjects.
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Abbreviations
- CV:
-
Coefficient of variation
- DTI:
-
Diffusion tensor imaging
- EPI:
-
Echo-planar imaging
- FA:
-
Fractional anisotropy
- FT:
-
Femoral trochlea
- KL:
-
Kellgren-Lawrence score
- LFC:
-
Lateral femoral condyle
- LT:
-
Lateral tibia
- MD:
-
Mean diffusivity
- MFC:
-
Medial femoral condyle
- MRI:
-
Magnetic resonance imaging
- MT:
-
Medial tibia
- OA:
-
Osteoarthritis
- P:
-
Patella
- PG:
-
Proteoglycan
- RAISED:
-
Radial imaging spin-echo diffusion tensor
- SE:
-
Spin echo
- SNR:
-
Signal-to-noise ratio
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Funding
This study has received funding from the (US) National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) of the National Institute of Health (NIH), Grant/Award Number R01AR067789.
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The scientific guarantor of this publication is José G Raya, 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.
Statistics and biometry
One of the authors has significant statistical expertise.
No complex statistical methods were necessary for this paper.
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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.
Methodology
• prospective
• case-control study
• performed at one institution
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Duarte, A., Ruiz, A., Ferizi, U. et al. Diffusion tensor imaging of articular cartilage using a navigated radial imaging spin-echo diffusion (RAISED) sequence. Eur Radiol 29, 2598–2607 (2019). https://doi.org/10.1007/s00330-018-5780-9
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DOI: https://doi.org/10.1007/s00330-018-5780-9