3D imaging of moving cells within droplets with a staggered bifocal microlens array

Area of Science:

• Biomedical Engineering
• Microscopy
• Cell Biology

Background:

• Three-dimensional (3D) live-cell imaging is crucial for understanding biological processes.
• Traditional scanning-based 3D imaging lacks the temporal resolution for dynamic live-cell studies.
• Light-field microscopy (LFM) offers rapid 3D data acquisition but suffers from limited spatial resolution and reconstruction artifacts.

Purpose of the Study:

• To overcome the limitations of conventional light-field microscopy (LFM) for 3D live-cell imaging.
• To enhance the spatial resolution and minimize reconstruction artifacts in LFM.
• To introduce a novel, cost-effective bifocal microlens array (MLA) for improved LFM performance.

Main Methods:

• Fabrication of a custom-designed staggered bifocal microlens array (MLA) using a high-throughput method.
• Characterization of the bifocal MLA's performance in enhancing spatial resolution and reducing artifacts.
• Demonstration of the technique using 3D imaging of microbeads and live cells in droplets.

Main Results:

• The custom bifocal MLA significantly improved spatial resolution compared to uniform MLAs.
• Reconstruction artifacts were substantially minimized with the proposed bifocal MLA.
• Successful 3D imaging of microbeads and live cells demonstrated the technique's efficacy.

Conclusions:

• The developed staggered bifocal MLA is a cost-effective advancement for light-field microscopy.
• This technology enhances LFM's capability for high-resolution 3D live-cell imaging.
• The bifocal MLA promises to broaden the application of LFM in biological research.