Quantitative cerebral blood flow imaging with extended-focus optical coherence microscopy

Area of Science:

• Neuroscience
• Biomedical Optics
• Medical Imaging

Background:

• Quantitative 3D blood flow imaging is crucial for understanding brain physiology.
• Two-photon microscopy (2PM) offers high resolution but requires long acquisition times for 3D volumes.
• Fourier domain optical coherence tomography (FDOCT) provides fast 3D acquisition but lacks spatial resolution.

Purpose of the Study:

• To introduce and validate extended-focus optical coherence microscopy (xfOCM) for high-resolution 3D brain blood flow imaging.
• To overcome the trade-off between speed and resolution in current blood flow imaging techniques.
• To demonstrate the capability of xfOCM for quantitative velocity vector imaging in the murine brain.

Main Methods:

• Development and application of extended-focus optical coherence microscopy (xfOCM).
• xfOCM combines high volume acquisition rates with resolution comparable to two-photon microscopy.
• Quantitative imaging of blood flow velocity vector magnitude in the adult murine brain.

Main Results:

• xfOCM achieved high-resolution quantitative imaging of blood flow velocity in the adult murine brain.
• The technique successfully combined the high volume acquisition rate of FDOCT with the resolution of 2PM.
• Demonstrated the feasibility of xfOCM for detailed investigation of cerebral hemodynamics.

Conclusions:

• xfOCM is a powerful new tool for high-resolution, quantitative 3D blood flow imaging in the brain.
• This method overcomes previous limitations, enabling faster and more detailed studies of brain physiology.
• xfOCM holds significant potential for advancing neuroscience research and understanding brain function.