Two-Dimensional Shear-Wave Elastography: Accuracy in Liver Fibrosis Staging Using Magnetic Resonance Elastography as...

Area of Science:

• Hepatology
• Medical Imaging
• Diagnostic Ultrasound

Background:

• Accurate liver fibrosis staging is critical for managing chronic liver disease (CLD).
• Magnetic resonance elastography (MRE) is the gold standard but faces accessibility limitations due to cost and specialized requirements.
• Two-dimensional shear-wave elastography (2D-SWE) presents a more accessible, affordable alternative integrated into routine ultrasound systems.

Purpose of the Study:

• To establish optimal 2D-SWE cut-off values for identifying significant liver fibrosis (≥F2).
• To assess the diagnostic performance of 2D-SWE across various stages of liver fibrosis.
• To compare 2D-SWE accuracy against the reference standard, MRE.

Main Methods:

• Prospective study involving 71 patients with suspected CLD.
• Simultaneous MRE and 2D-SWE examinations on the same day.
• Calculation of sensitivity, specificity, AUROC, and likelihood ratios for different 2D-SWE thresholds, using MRE for fibrosis staging.

Main Results:

• A 2D-SWE cut-off of 7.0 kPa demonstrated 100% sensitivity and 85.7% specificity for ≥F2 fibrosis.
• A threshold of 8.0 kPa improved specificity to 91.8% (86.4% sensitivity) with an AUROC of 0.89.
• A 11.0 kPa cut-off achieved 100% sensitivity and 96.9% specificity for cirrhosis.
• A 5.0 kPa cut-off effectively excluded abnormal liver stiffness with 89.1% sensitivity.

Conclusions:

• Two-dimensional SWE is a highly reliable noninvasive tool for liver fibrosis staging.
• Recommended 2D-SWE thresholds include 7.0 kPa for screening significant fibrosis, 8.0 kPa for confirmation, and 11.0 kPa for cirrhosis diagnosis.
• A 5.0 kPa threshold is effective in ruling out abnormal liver stiffness, enhancing diagnostic utility.