2.5D microscopy: Fast, high-throughput imaging via volumetric projection for quantitative subcellular analysis.

Area of Science:

• Biophotonics
• Cellular Imaging
• Molecular Biology

Background:

• Single-cell analysis using imaging is crucial for understanding biomolecule expression and function at subcellular resolution.
• Current fluorescence imaging methods suffer from low throughput, limiting the analysis of multiple cells and cellular features rapidly.
• High-resolution, high-throughput imaging is needed to advance cellular and molecular biology research.

Purpose of the Study:

• To develop a novel microscopy technique that significantly improves the throughput of fluorescence imaging systems.
• To maintain high-resolution and single-molecule sensitivity while increasing imaging speed.
• To enable rapid, quantitative analysis of cellular features across multiple cells.

Main Methods:

• Developed 2.5D microscopy by engineering emitted fluorescence light to project volumetric information onto a 2D image plane in a single shot, avoiding sequential z-scanning.
• Engineered the system for improved imaging speed and uniform focal response within a specific imaging depth.
• Integrated multi-color imaging, depth control, and super-resolution capabilities.

Main Results:

• Achieved quantitative single-molecule RNA measurements in mammalian cells over a 2×2 mm² region within a ~5 μm depth in under 10 minutes.
• Demonstrated immunofluorescence imaging at a volumetric frame rate exceeding 30 Hz with reduced photobleaching.
• Successfully implemented multi-color imaging, depth control, and super-resolution imaging functionalities.

Conclusions:

• 2.5D microscopy offers a significant throughput improvement for fluorescence imaging, enabling faster and more efficient single-cell analysis.
• The technique maintains high resolution and single-molecule sensitivity, making it suitable for quantitative studies of biomolecules.
• This advancement facilitates rapid, large-scale cellular imaging with applications in molecular biology and biophotonics.