Structure Function Estimated From Histological Tissue Sections.

Area of Science:

• Biophysics
• Medical Imaging
• Acoustics

Background:

• Ultrasonic scattering depends on scatterer properties and their spatial correlation.
• Scatterer spatial correlation's role in dense media is not fully understood.
• The structure function models spatial correlation's effect on backscatter coefficient (BSC).

Purpose of the Study:

• To estimate the structure function from histology.
• To verify if acoustic BSC-derived structure functions reflect actual scatterer spatial distribution.
• To assess the accuracy of cell radius estimation using this method.

Main Methods:

• Digitizing H&E stained histology sections of cell pellets.
• Manually determining scatterer positions from images.
• Calculating the structure function from extracted scatterer positions.
• Comparing histological structure functions with those derived from acoustic BSC data.

Main Results:

• Histological structure functions showed shape agreement but amplitude differences with acoustic estimates.
• Fitting a polydisperse model to histological data yielded accurate cell radius estimates.
• Acoustic data from mouse tumors correlated with cell spatial distribution via histology-derived structure functions.

Conclusions:

• Agreement between acoustically and histologically estimated structure functions supports their link to scatterer spatial distribution.
• Histological validation enhances understanding of ultrasonic scattering in dense media.
• This approach improves scatterer characterization and potential for biomedical applications.