High-speed multifocal array scanning using refractive window tilting.

Area of Science:

• Microscopy and Imaging Technologies
• Biophysics and Molecular Imaging
• High-Content Screening (HCS) for Drug Discovery

Background:

• Confocal microscopy offers advantages over wide-field microscopy, including out-of-focus light suppression and 3D sectioning.
• Multiplexed confocal microscopy is crucial for high-throughput applications like high-content screening (HCS) in drug discovery.
• Fluorescence lifetime imaging microscopy (FLIM) is a powerful HCS modality for studying protein-protein interactions via Förster resonant energy transfer (FRET).

Purpose of the Study:

• To develop a novel scanning method for multiplexed confocal FLIM suitable for high-throughput applications.
• To overcome the limitations of traditional scanning methods in achieving high resolution and throughput for FLIM-FRET in HCS.
• To demonstrate the benefits of the new scanning method compared to conventional galvanometer scanners.

Main Methods:

• Development of a novel foci array scan method using stationary lenslet arrays and optical flats for 2D foci steering via refraction.
• Integration of the foci array scanning scheme into a multiplexing confocal FLIM system.
• Comparison of the new scanning method with traditional mirror galvanometer scanners.

Main Results:

• The foci array scan method enables uniform multiplex confocal acquisition for high-resolution and high-throughput FLIM.
• The developed system demonstrates clear benefits over traditional mirror galvanometer scanners.
• Advantages include improved scan linearity, uniformity, reduced cost, and lower complexity.

Conclusions:

• The novel foci array scan method is a significant advancement for multiplexed confocal FLIM systems.
• This technology enhances the suitability of FLIM-FRET for high-content screening in drug discovery.
• The method offers a more efficient, cost-effective, and simpler alternative to existing scanning technologies.