Frequency-domain wide-field laser Doppler in vivo imaging

Area of Science:

• Biomedical Optics
• Neuroimaging
• Laser Doppler Flowmetry

Background:

• Accurate measurement of blood flow is crucial for understanding brain function and disease.
• Existing methods for wide-field blood flow imaging can be limited in resolution or speed.

Purpose of the Study:

• To introduce a novel wide-field laser Doppler instrument for in vivo blood flow mapping.
• To demonstrate the instrument's capability in visualizing blood flow dynamics in the mouse brain.

Main Methods:

• Utilized a low-frame-rate (8 Hz) CCD camera in a heterodyne optical-mixing configuration.
• Employed a frequency-shifting digital holography scheme for data acquisition.
• Acquired wide-field laser Doppler maps of blood flow in a mouse brain model.

Main Results:

• Successfully generated wide-field laser Doppler maps of blood flow.
• Demonstrated the clear Doppler signature indicative of blood flow in the mouse brain, in vivo.
• The instrument provided detailed visualization of blood flow patterns.

Conclusions:

• The developed instrument enables effective wide-field mapping of blood flow using laser Doppler and digital holography.
• This technology offers a promising approach for in vivo neuroscience research and potentially clinical applications.
• The system provides a valuable tool for studying microvascular dynamics in biological tissues.