Abstract
Objectives
To investigate optimised isotropic 3D turbo spin echo (TSE) and gradient echo (GRE)-based pulse sequences for visualisation of articular cartilage lesions within the knee joint.
Methods
Optimisation of experimental imaging sequences was completed using healthy volunteers (n=16) with a 3-Tesla (3T) MRI scanner. Imaging of patients with knee cartilage abnormalities (n=57) was then performed. Acquired sequences included 3D proton density-weighted (PDW) TSE (SPACE) with and without fat-suppression (FS), and T2*W GRE (TrueFISP) sequences, with acquisition times of 6:51, 6:32 and 5:35 min, respectively.
Results
One hundred sixty-one confirmed cartilage lesions were detected and categorised (Grade II n=90, Grade III n=71). The highest sensitivity and specificity for detecting cartilage lesions were obtained with TrueFISP with values of 84.7% and 92%, respectively. Cartilage SNR mean for PDW SPACE-FS was the highest at 72.2. TrueFISP attained the highest CNR means for joint fluid/cartilage (101.5) and joint fluid/ligament (156.5), and the lowest CNR for cartilage/meniscus (48.5). Significant differences were identified across the three sequences for all anatomical structures with respect to SNR and CNR findings (p-value <0.05).
Conclusion
Isotropic TrueFISP at 3T, optimised for acquisition time, accurately detects cartilage defects, although it demonstrated the lowest contrast between cartilage and meniscus.
Key points
• Cartilage is better visualised with 3D TrueFISP than 3D SPACE sequences.
• 3D TrueFISP is a reliable sequence for detecting low- and high-grade cartilage defects.
• 3D TrueFISP at 3T provides excellent contrast between cartilage and joint fluid.
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The scientific guarantor of this publication is Prof Louise Rainford.
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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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The authors state that this work has not received any funding.
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One of the authors has significant statistical expertise and is employed as a statistician in a third level academic institution.
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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
• experimental
• performed at one institution
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Abdulaal, O., Rainford, L., MacMahon, P. et al. 3T MRI of the knee with optimised isotropic 3D sequences: Accurate delineation of intra-articular pathology without prolonged acquisition times. Eur Radiol 27, 4563–4570 (2017). https://doi.org/10.1007/s00330-017-4816-x
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DOI: https://doi.org/10.1007/s00330-017-4816-x