Exploring the Interplay of Wavelength, Quantum Yield, and Penetration Depth in In Vivo Fluorescence Imaging

Area of Science:

• Biomedical Optics
• Fluorescence Imaging
• Computational Biology

Background:

• In vivo fluorescence imaging relies on understanding fluorophore behavior, including quantum yield (QY) and penetration depth.
• Wavelength-dependent variations in QY and imaging depth significantly affect imaging accuracy and efficiency in biological tissues.

Purpose of the Study:

• To investigate the influence of irradiation wavelength on fluorophore quantum yield (QY) and imaging depth in vivo.
• To analyze the complex dynamics of fluorescence in biological tissues using Monte Carlo simulations.
• To explore multiplexing capabilities in fluorescence imaging across different depths and wavelengths.

Main Methods:

• Utilized Monte Carlo simulations to model wide-field fluorescence imaging conditions.
• Examined the impact of varying wavelengths on dye QY and penetration depth.
• Analyzed the exponential decay of emission depth exponents and wavelength-dependent QY variations.

Main Results:

• Observed a transition in emission depth exponent decay around 500-600 nm, indicating depth's variable influence.
• Identified significant wavelength-dependent variations in fluorophore QY, particularly between 600-700 nm.
• Gained insights into the spacing of identical spots in multiplexing images at various depths and wavelengths.

Conclusions:

• Wavelength is a critical factor influencing both fluorophore QY and imaging depth in vivo.
• The observed transition zone (500-600 nm) and peak QY impact range (600-700 nm) are crucial for optimizing fluorescence imaging.
• Findings provide a foundation for enhanced multiplexing strategies in fluorescence imaging applications.