Depth-enhanced fluorescence imaging using masked detection of structured illumination

Area of Science:

• Biomedical optics
• Fluorescence imaging
• In vivo imaging

Background:

• Imaging fluorescence contrast at depth in living tissues is challenging.
• Current methods require multiple image acquisitions and postprocessing.
• Existing techniques offer either depth-sectioned or tomographic fluorescence information.

Purpose of the Study:

• To introduce a novel method for enhancing deep-tissue fluorescence imaging.
• To enable real-time fluorescence imaging at depth without postprocessing.
• To improve the detection of fluorescence information within scattering media.

Main Methods:

• Masked detection of structured illumination (MDSI) technique.
• Scanning a collimated beam onto a turbid medium.
• Physical masking of the point spread function before CCD camera acquisition.
• Preferential collection of diffuse photons at a specific source-detector range.

Main Results:

• MDSI enhances fluorescence imaging at depth.
• The method operates without the need for postprocessing.
• Potential for real-time image formation is demonstrated.
• Improved collection of diffuse photons aids depth penetration.

Conclusions:

• MDSI is a promising technique for deep-tissue fluorescence imaging.
• The method simplifies fluorescence imaging by eliminating postprocessing steps.
• MDSI offers real-time imaging capabilities for in vivo applications.
• This approach advances optical imaging in biological tissues.