Continuous Shear Wave Elastography for Liver Using Frame-to-Frame Equalization of Complex Amplitude.

Area of Science:

• Medical Imaging
• Biophysics
• Diagnostic Technologies

Background:

• Noninvasive liver fibrosis diagnosis is crucial.
• Continuous shear wave elastography (C-SWE) shows promise but faces signal instability issues in deep tissue.
• Accurate liver elasticity assessment is vital for fibrosis staging.

Purpose of the Study:

• To develop and validate a novel method to enhance signal stability in C-SWE for liver elasticity assessment.
• To improve the accuracy of noninvasive liver fibrosis diagnosis using C-SWE.
• To address the challenge of signal instability in deep-region C-SWE applications.

Main Methods:

• Proposed a method involving multi-frame dataset acquisition and compression.
• Implemented a frame-to-frame equalization technique to correct initial phase discrepancies.
• Validated the approach using both phantom and in vivo experiments, comparing with established shear wave elastography (SWE).

Main Results:

• The proposed frame-to-frame equalization significantly enhanced signal stability in C-SWE data.
• Phantom tests showed excellent agreement with established SWE, with less than 4.2% error in shear wave velocity.
• In vivo experiments confirmed the efficacy of the stabilization technique for assessing human liver elasticity.

Conclusions:

• The frame-to-frame equalization technique effectively stabilizes shear waves, enabling accurate liver elasticity assessment.
• Continuous shear wave elastography (C-SWE) with this enhancement is a viable tool for noninvasive liver fibrosis diagnosis.
• This method holds significant potential for improving clinical diagnostics of liver fibrosis.