Timing and operating mode design for time-gated fluorescence lifetime imaging microscopy.

Area of Science:

• Biophotonics
• Microscopy
• Spectroscopy

Background:

• Fluorescence imaging techniques, including steady-state and time-resolved methods, are crucial in research.
• Fluorescence lifetime imaging offers advantages over intensity-based methods due to its independence from excitation intensity, fluorophore concentration, and photobleaching.
• Time-gated fluorescence lifetime imaging microscopy (FLIM) represents a mature technology capable of high resolution and imaging frame rates.

Purpose of the Study:

• To introduce an abstract time-gated FLIM model.
• To design distinct operation modes and algorithms tailored for both steady-state and transient fluorescence imaging applications.
• To demonstrate the capability of achieving high resolution and high frame rates in FLIM.

Main Methods:

• Development of an abstract time-gated FLIM model detailing key temporal parameters.
• Design of two operation modes: one-excitation one-sampling for steady imaging and one-excitation two-sampling for transient imaging.
• Implementation of algorithms: least squares for steady-state and rapid lifetime determination for transient fluorescence processes.

Main Results:

• The proposed model and methods enable high-resolution and high-frame-rate imaging for steady-state fluorescence applications.
• The designed algorithms effectively support transient fluorescence situations, improving imaging speed and accuracy.
• The time-gated FLIM approach demonstrates versatility for diverse fluorescence imaging needs.

Conclusions:

• The developed time-gated FLIM model and associated operational modes provide a robust framework for advanced fluorescence imaging.
• This approach enhances imaging performance, offering significant improvements in resolution and speed for both steady and transient fluorescence phenomena.
• The study contributes to the advancement of FLIM techniques for various scientific applications.