Fluorescence laminar optical tomography for brain imaging: system implementation and performance evaluation.

Area of Science:

• Biomedical optics
• Neuroimaging
• Fluorescence tomography

Background:

• Noninvasive imaging of fluorescence proteins in rodent brains is crucial for neuroscience research.
• Existing methods may lack the resolution or depth required for studying brain circuit dynamics.

Purpose of the Study:

• To implement a fluorescence laminar optical tomography (FLOT) scanner for high-resolution, 3D in vivo imaging of fluorescence proteins in small rodent brains.
• To develop and validate image reconstruction algorithms for accurate light-tissue interaction modeling.

Main Methods:

• Utilized a laser beam scanned via a cylindrical lens for surface illumination.
• Employed epi-fluorescence optics and an electron multiplication CCD sensor for signal detection.
• Developed image reconstruction algorithms using Monte Carlo simulations and iterative simultaneous algebraic reconstruction technique (SART).

Main Results:

• Successfully imaged microfabricated silicon microchannels in a brain-mimicking phantom.
• Demonstrated in vivo imaging of rodent brain tissue.
• Validated the hardware design and reconstruction algorithms through experimental results.

Conclusions:

• The developed FLOT system provides a noninvasive tool for 3D fluorescence imaging in rodent brains.
• This technology can significantly facilitate neuroscience experiments studying brain circuitries using molecular genetic methods.
• The system's performance in phantoms and in vivo suggests its potential for advancing our understanding of neural dynamics.