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Related Experiment Video

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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population

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Ultrasound Characterization of Cortical Bone Using Shannon Entropy.

Yasamin Karbalaeisadegh¹, Shanshan Yao², Yong Zhu¹

¹Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, USA.

Ultrasound in Medicine & Biology

|May 27, 2023

Summary

This summary is machine-generated.

Shannon entropy quantifies microstructural changes in materials by analyzing ultrasound signals. This method shows potential for diagnosing and monitoring osteoporosis by assessing cortical bone porosity.

Keywords:

Quantitative ultrasound Shannon entropy Tissue characterization

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Area of Science:

Ultrasound physics
Biomaterials science
Medical imaging

Background:

Ultrasound backscattered signals provide insights into heterogeneous media microstructures.
Pores in cortical bone scatter ultrasound waves, influencing signal characteristics.

Purpose of the Study:

To investigate the utility of Shannon entropy for characterizing cortical porosity.
To evaluate Shannon entropy as a quantitative ultrasound parameter for microstructural assessment.

Main Methods:

Shannon entropy was applied to polydimethylsiloxane (PDMS) samples with controlled scatterer concentrations.
Numerical simulations were performed on cortical bone models with varying porosity parameters.
Experimental and simulation data were analyzed to correlate entropy with microstructural features.

Main Results:

Increased pore diameter and porosity correlated with higher Shannon entropy, indicating greater signal randomness.
Entropy showed an increasing trend with scatterer concentration in PDMS, leveling off at higher concentrations.
High attenuation led to decreased signal amplitude and entropy; similar trends were observed in bone samples with porosity >15%.

Conclusions:

Shannon entropy is sensitive to microstructural variations in scattering and absorbing media.
This technique holds promise for the diagnosis and monitoring of osteoporosis.
Quantitative ultrasound analysis using Shannon entropy offers a novel approach for bone health assessment.