Simulation of ultrasound backscatter coefficient measurement using the finite element method

Area of Science:

• Biomedical Ultrasound
• Medical Imaging
• Acoustic Physics

Background:

• Ultrasound backscatter coefficient (BSC) measurement assesses tissue morphology for disease detection, including cancer.
• Current BSC measurement accuracy is limited by normalization challenges related to frequency-dependent diffraction and attenuation.

Purpose of the Study:

• To develop and validate a simulation-based approach for investigating errors in ultrasound BSC measurements.
• To create a tool for rapid, lightweight 2D Finite Element (FE) simulations of BSC measurements.

Main Methods:

• A 2D Finite Element (FE) simulation tool was developed to mimic BSC measurements using the planar reflector substitution method.
• New derivations of BSC equations in reduced dimensionality were created for verification.
• Simulations were performed on an incoherent scattering medium across various source f-numbers.

Main Results:

• The simulation tool achieved BSC estimates within 6% of the theoretical value for incoherent scattering media.
• This error rate is comparable to other simulation methods and physical experiments.
• The model successfully reproduced results across a range of source f-numbers.

Conclusions:

• The developed 2D FE simulation model provides a robust framework for investigating BSC measurement accuracy.
• This approach facilitates rapid data generation for understanding factors influencing BSC measurement errors.
• The study establishes a theoretical and experimental basis for improving diagnostic accuracy in ultrasound imaging.