Clinical Diagnostic Value of 5 T MRI for Knee Injuries: A Comparison Study With 1.5 or 3 T

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.