Multi-parametric Photoacoustic Imaging Combined with Acoustic Radiation Force Impulse Imaging for Applications in...

Area of Science:

• Biomaterials Science
• Medical Imaging
• Regenerative Medicine

Background:

• Tissue engineering scaffolds are complex and optically opaque, challenging traditional imaging methods.
• Characterizing internal structure, cell proliferation, and mechanical properties of these scaffolds is crucial for regeneration.

Purpose of the Study:

• To develop and validate a novel multi-modal imaging approach for characterizing thick, optically opaque tissue-engineered scaffolds.
• To assess melanoma cell growth and scaffold properties within silk fibroin scaffolds using the developed imaging system.

Main Methods:

• Integrated ultrasound, photoacoustic, and acoustic radiation force impulse imaging techniques.
• Applied the system to silk fibroin scaffolds with varying pore sizes and stiffness over different cell incubation periods.
• Analyzed scaffold structure, cell penetration depth, and biomechanical property homogeneity.

Main Results:

• The multi-modal imaging system successfully provided mesoscale insights into scaffold internal structure and cell penetration.
• Demonstrated the ability to monitor cell proliferation and evaluate scaffold stiffness homogeneity.
• Detailed analysis of melanoma cell growth within silk fibroin scaffolds with varying pore sizes and incubation times.

Conclusions:

• The developed acoustic-based multi-modal imaging technique overcomes optical limitations for characterizing tissue-engineered scaffolds.
• This non-invasive approach offers comprehensive understanding of scaffold physical and biological dynamics.
• The technique is pivotal for advancing tissue engineering by enabling better scaffold characterization and driving successful regenerative solutions.