Synchronized strobed phase contrast and fluorescence microscopy: the interlaced standard reimagined

Area of Science:

• Microscopy
• Live-cell imaging
• Biophotonics

Background:

• Simultaneous phase contrast and fluorescence imaging is crucial for live-cell studies.
• Existing methods can be complex, costly, or require optical path modifications.

Purpose of the Study:

• To present a simple, cost-effective method for synchronized phase contrast and fluorescence video acquisition.
• To enable real-time, spatially aligned imaging of live samples using standard fluorescence microscopes.

Main Methods:

• Utilized counter-phased pulses of phase contrast illumination and fluorescence excitation light.
• Synchronized illumination pulses with the exposure of interlaced camera sensor fields.
• Separated the combined video frames into independent phase contrast and fluorescence videos via de-interlacing.

Main Results:

• Achieved real-time acquisition and display of synchronized phase contrast and fluorescence image sequences.
• Generated video sequences where each frame contains both imaging modes in spatially distinct pixel regions.
• Demonstrated the method's compatibility with standard fluorescence microscopes without optical modifications.

Conclusions:

• The proposed method offers a simple and cost-effective solution for dual-mode live-sample imaging.
• Enables simultaneous visualization of morphology (phase contrast) and specific structures (fluorescence) in live biological samples.
• Provides a versatile tool for researchers without requiring specialized or modified microscopy equipment.