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Clinical Diagnostic Value of 5 T MRI for Knee Injuries: A Comparison Study With 1.5 or 3 T
Suwei Liu1, Ming Ni1, Dingyu Wang2
1Department of Radiology, Peking University Third Hospital, Beijing, China.
Background:
Preliminary studies have shown the potential of 5 T MRI in cardiac, neurovascular, and abdominal imaging. However, the clinical diagnostic value of 5 T for assessing knee injuries remains unclear.
Purpose:
To compare the image quality, anatomic visibility, and diagnostic performance of 1.5, 3, and 5 T in paired MRI knee studies.
Study Type:
Prospective.
Population:
Ninety patients underwent 1.5-5 or 3-5 T paired MRI scans.
Field Strength/Sequence:
2D T1-weighted and 2D and 3D fat-suppressed proton density-weighted at 1.5, 3, and 5 T.
Assessment:
Three radiologists independently performed a quantitative assessment of signal-to-noise ratio (SNR) and a qualitative evaluation of overall image quality, edge sharpness, artifacts, fat-suppression homogeneity, and anatomic visibility by using a 5-point Likert scale. The ability to detect knee injuries was determined using arthroscopy results as the reference standard.
Statistical Tests:
Differences between 5 and 1.5/3 T MRI were analyzed using the Wilcoxon signed-rank test or Student's t test. The sensitivity, specificity, accuracy, and area under the receiver operating characteristic curve (AUC) were used to assess diagnostic performance. DeLong's test was used to determine the significance of AUC differences.
Results:
Median SNRs at 5 T were higher than those at 3 T (56.8-287.1 vs. 47.5-229.1; p < 0.046) and 1.5 T (69.5-258.4 vs. 35.1-188.9; p < 0.001) across all acquisitions. Moreover, 5 T MRI demonstrated significantly better overall image quality and edge sharpness than those demonstrated by 3 T (median range: 3-5 vs. 3-4; p = 0.048 and 3-5 vs. 2-4, p = 0.033) or 1.5 T (3-5 vs. 3-4; p = 0.035 and 3-5 vs. 2-3; p = 0.017). Finally, 5 T MRI showed a higher AUC value than 3 T (94%-100% vs. 81%-90%) and 1.5 T (97%-100% vs. 81%-90%), particularly for trochlear, tibial plateau, and femoral condyle cartilage defects.
Data Conclusion:
Compared to 1.5 and 3 T MRI, it significantly improved image quality, anatomical visibility, and diagnostic performance, especially for subtle cartilage defects.
Evidence Level:
1.
Technical Efficacy:
Stage 2.
Insights
Five Tesla (5T) MRI significantly enhances knee injury diagnosis compared to 1.5T and 3T. This advanced magnetic resonance imaging (MRI) technique offers superior image quality and diagnostic accuracy for detecting subtle cartilage defects.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Radiology
- Orthopedic Imaging
Background:
- Preliminary studies indicate 5 Tesla (5T) MRI's potential in cardiac, neurovascular, and abdominal imaging.
- The clinical diagnostic value of 5T MRI for knee injuries remains under investigation.
Purpose of the Study:
- To compare the image quality, anatomical visibility, and diagnostic performance of 1.5T, 3T, and 5T MRI in paired knee studies.
- To evaluate the effectiveness of 5T MRI in identifying knee injuries.
Main Methods:
- Prospective study involving 90 patients undergoing paired 1.5T/5T or 3T/5T MRI scans.
- Quantitative (signal-to-noise ratio) and qualitative (image quality, sharpness, artifacts, fat-suppression, visibility) assessments were performed by three radiologists.
- Diagnostic performance was evaluated against arthroscopy results, using sensitivity, specificity, accuracy, and area under the receiver operating characteristic curve (AUC).
Main Results:
- Median signal-to-noise ratios (SNRs) were significantly higher at 5T compared to 1.5T and 3T across all sequences (p < 0.046).
- 5T MRI demonstrated superior overall image quality and edge sharpness compared to 1.5T and 3T (p < 0.048).
- 5T MRI achieved higher AUC values (94%-100%) than 3T (81%-90%) and 1.5T (81%-90%), particularly for detecting cartilage defects in the trochlea, tibial plateau, and femoral condyles.
Conclusions:
- 5T MRI significantly improves image quality, anatomical visibility, and diagnostic performance for knee injuries compared to 1.5T and 3T.
- The enhanced diagnostic capabilities of 5T MRI are especially notable for subtle cartilage defects.
- 5T MRI represents a valuable advancement for knee injury assessment.
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