Scanning thin-sheet laser imaging microscopy (sTSLIM) with structured illumination and HiLo background rejection

Area of Science:

• Microscopy
• Biophotonics
• Optical Imaging

Background:

• Light-sheet fluorescence microscopy enables imaging of large specimens.
• Traditional thin-sheet laser imaging microscopes (TSLIM) use static illumination.
• Improving contrast and reducing background noise are critical for high-resolution imaging.

Purpose of the Study:

• To modify a TSLIM for structured illumination (SI) and HiLo image demodulation.
• To enhance background rejection and improve image contrast.
• To develop an optimized light-sheet microscope for large samples.

Main Methods:

• Replaced one static illumination side of a TSLIM with an intensity-modulated laser scanner.
• Implemented SI and HiLo techniques for image demodulation.
• Characterized the static and scanned light-sheet thicknesses and imaging resolution.

Main Results:

• The modified system, sTSLIM, integrates static and scanned light-sheets.
• SI and HiLo techniques yielded superior contrast compared to uniform illumination.
• HiLo imaging provided higher contrast, faster acquisition (2/3rds time), and fewer artifacts than SI.

Conclusions:

• sTSLIM offers enhanced contrast and background rejection for large specimen imaging.
• HiLo demodulation is a robust and efficient technique for light-sheet microscopy.
• The developed system achieves subcellular resolution for specimens up to 15 mm.