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Fast functional imaging of single neurons using random-access multiphoton (RAMP) microscopy.
Vijay Iyer1, Tycho M Hoogland, Peter Saggau
1Department of Neuroscience, One Baylor Plaza, S603, Houston, TX 77030, USA.
Journal of Neurophysiology
|October 14, 2005
Summary
Random-access multiphoton (RAMP) microscopy enables simultaneous monitoring of neuronal activity at multiple sites. This novel optical imaging technique significantly enhances experimental throughput for studying dendritic function.
Area of Science:
- Neuroscience
- Optical Imaging
- Cellular Biology
Background:
- Studying dendritic signaling requires monitoring neuronal activity at multiple sites.
- Conventional optical methods have limited spatio-temporal resolution for dendritic studies.
- Accessing submicron dendritic structures is challenging.
Purpose of the Study:
- To introduce a novel functional imaging technique, random-access multiphoton (RAMP) microscopy.
- To overcome limitations of current optical recording techniques for dendritic studies.
- To enable high-throughput investigation of dendritic structure and function.
Main Methods:
- Utilizes multiphoton excitation with an inertia-free scanning mechanism.
- Employs two-dimensional acousto-optic deflection for rapid beam positioning.
- Allows rapid site selection for focused laser beam dwell periods.
Main Results:
- RAMP microscopy maps neuronal activity in various compartments at high frame rates.
- Maintains signal-to-noise ratio comparable to conventional scanning microscopy.
- Preserves excellent structural imaging capabilities, including optical sectioning and high resolution in scattering tissue.
Conclusions:
- RAMP microscopy is a versatile tool for dendritic signaling and computation studies.
- Significantly enhances experimental throughput for correlating dendritic structure and function.
- Enables detailed investigation of neuronal activity in complex cellular structures.