Video-rate molecular imaging in vivo with stimulated Raman scattering

Area of Science:

• Biomedical Optics
• Molecular Imaging
• Vibrational Spectroscopy

Background:

• Optical imaging offers high resolution and sensitivity for biomedical applications.
• Stimulated Raman scattering (SRS) microscopy provides label-free imaging based on molecular vibrations.
• Current SRS limitations include poor signal collection and slow speeds, hindering in vivo applications.

Purpose of the Study:

• To overcome limitations of current SRS microscopy for in vivo applications.
• To develop a faster and more sensitive SRS technique for imaging in living subjects.
• To enable label-free, real-time optical imaging in vivo.

Main Methods:

• Enhanced collection of backscattered signals in SRS microscopy.
• Increased imaging speed by three orders of magnitude to video rate.
• Application of the improved SRS technique for in vivo imaging.

Main Results:

• Achieved significantly enhanced backscattered signal collection.
• Enabled SRS imaging at video rate, overcoming previous speed limitations.
• Demonstrated label-free in vivo imaging of water, lipid, and protein in skin.
• Successfully mapped topical drug penetration pathways in mice and humans.

Conclusions:

• The developed SRS microscopy technique significantly advances in vivo optical imaging capabilities.
• This method allows for label-free, high-speed visualization of biological tissues and molecular components in living subjects.
• The technique has potential applications in drug development and clinical diagnostics.