Two-photon microscopy through scattering media harnessing speckle autocorrelation

Area of Science:

• Biomedical Optics
• Microscopy Techniques
• Image Reconstruction

Background:

• Two-photon (2P) microscopy enables deep-tissue fluorescence imaging but is limited by light scattering.
• Conventional wavefront shaping (WFS) strategies struggle with computationally recovering 2P signals from scattering media.
• Advanced imaging techniques are needed to overcome scattering limitations in biological tissues.

Purpose of the Study:

• To demonstrate a novel method for reconstructing fluorescent objects behind scattering layers using 2P microscopy.
• To enhance the depth imaging capabilities of 2P microscopy in scattering environments.
• To address the computational challenges in recovering 2P images through scattering media.

Main Methods:

• Utilized the optical memory effect (ME) for image reconstruction.
• Employed speckle autocorrelation techniques to analyze scattered light.
• Applied a phase retrieval algorithm to recover object information.
• Integrated these methods within a 2P microscopy framework.

Main Results:

• Successfully reconstructed fluorescent objects located behind scattering layers.
• Demonstrated the effectiveness of the combined ME, speckle autocorrelation, and phase retrieval approach.
• Showcased significant improvements in depth imaging through scattering media using 2P microscopy.

Conclusions:

• The developed method offers a powerful solution for deep-tissue imaging in 2P microscopy.
• This technique significantly enhances the ability to visualize structures through scattering biological tissues.
• The findings hold substantial potential for advancing in vivo imaging and diagnostics.