Structured illumination microscopy for high SNR 3D imaging from millimeter-thick tissues to cellular dynamics

Area of Science:

• Biomedical imaging
• Microscopy
• Cell biology

Background:

• Three-dimensional (3D) optical imaging provides physiological context for biological structures.
• Optical sectioning structured illumination microscopy (OS-SIM) offers high resolution, speed, and low phototoxicity.
• OS-SIM faces challenges in thick tissues due to low signal-to-noise ratio (SNR) and limited imaging depth caused by background and scattering.

Purpose of the Study:

• To develop a high SNR OS-SIM strategy for improved 3D imaging of biological samples.
• To overcome limitations of OS-SIM in thick tissues, enhancing SNR and imaging depth.

Main Methods:

• Developed a novel high SNR OS-SIM strategy.
• Implemented rapid processing to enhance SNR by approximately 10 dB.
• Applied the method to various biological samples including millimeter-thick tissues and live cells.

Main Results:

• Achieved high-quality 3D imaging of samples thicker than 2 mm.
• Doubled the imaging penetration depth compared to conventional OS-SIM.
• Enabled live-cell recording with a low light dose.

Conclusions:

• The developed high SNR OS-SIM strategy significantly enhances imaging capabilities for thick biological samples.
• This approach overcomes previous limitations, enabling deeper and clearer 3D visualization.
• The technique is anticipated to be powerful for researching cellular organelles and thick tissues in 3D morphology.