Interconversion of elasticity measurements between two-dimensional shear wave elastography and transient...

Area of Science:

• Medical Imaging
• Biophysics
• Pediatric Gastroenterology

Background:

• Shear wave elastography (SWE) and transient elastography (TE) are non-invasive methods to measure tissue elasticity.
• Variations in probe and device settings can lead to discrepancies in elasticity measurements.
• Standardizing elasticity measurements is crucial for accurate diagnosis and monitoring, particularly in pediatric conditions.

Purpose of the Study:

• To establish conversion equations for interchanging elasticity measurements between 2D SWE and TE.
• To enable comparison of stiffness data obtained using different elastography techniques and probes.
• To validate the reliability of converted elasticity values in pediatric patients with biliary atresia.

Main Methods:

• Phantom elasticity measurements using four 2D SWE probes and two TE probes.
• Regression analysis to correlate measurements with known phantom elasticities and derive conversion equations.
• Retrospective analysis of stiffness measurements in pediatric biliary atresia patients using both 2D SWE and TE within a 1-year interval.
• Intraclass correlation coefficient (ICC) to assess agreement between measured and converted values.

Main Results:

• Both 2D SWE and TE showed significant linear correlation with phantom elasticity across all probe settings (R2 > 0.97 for 2D SWE, R2 > 0.99 for TE).
• Excellent agreement was observed between measured and converted elasticity values in pediatric biliary atresia patients (ρ=0.828 within 1 year, ρ=0.863 within 2 months).
• The developed equations facilitated reliable estimation of elasticity values for different probe settings.

Conclusions:

• The derived equations enable accurate interconversion of elasticity values between 2D SWE and TE.
• These conversion equations provide a reliable method for estimating elasticity across different probes in pediatric biliary atresia.
• This standardization enhances the comparability of elastography data in clinical practice.