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A Guide to Structured Illumination TIRF Microscopy at High Speed with Multiple Colors

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High-throughput spatial light modulation two-photon microscopy for fast functional imaging.

Paolo Pozzi¹, Daniela Gandolfi², Marialuisa Tognolina³

¹University of Milan-Bicocca , Department of Physics, Piazza della Scienza 3, 20126 Milano, Italy.

|July 10, 2015

Summary

This summary is machine-generated.

A new holographic microscopy technique enables high-speed, parallel optical monitoring of neural activity. This digital setup simplifies complex transformations for accurate laser beam placement, improving stability and acquisition rates for neuroscience research.

Keywords:

calcium imaging cerebellum spatial light modulators two-photon microscopy

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Area of Science:

Neuroscience
Optical Microscopy
Biophysics

Background:

Monitoring single neuron activity requires high-throughput, millisecond temporal resolution.
Holographic two-photon microscopy (2PM) using spatial light modulators (SLMs) has been developed but involves complex coordinate transformations.
Existing methods can be limited by mechanically moving parts and complex setups.

Purpose of the Study:

To present a simpler, fully digital holographic two-photon microscopy setup (SLM-2PM).
To enable high-speed, parallel acquisition of neural signals with improved stability and accuracy.
To demonstrate the application in high-speed calcium imaging.

Main Methods:

A simplified, fully digital setup (SLM-2PM) utilizing only SLMs for optical monitoring.
Accurate placement of laser beamlets for precise focal volume illumination, eliminating mechanical parts.
Acquisition of 3D two-photon images and high-resolution structural images via raster-scanning.
Interactive, operator-guided selection of structures for investigation.
Functional signal collection by illuminating preselected points with a single hologram.

Main Results:

The SLM-2PM system allows accurate laser beamlet placement, enhancing stability for long acquisitions.
Diffraction-limited fluorescence signals are acquired, with acquisition rate limited by the pixelated detector.
High-resolution structural images enable targeted selection of regions for functional imaging.
High-speed (up to 1 kHz) two-photon calcium imaging was successfully demonstrated on acute cerebellar slices.

Conclusions:

The presented SLM-2PM system offers a simplified and stable approach for high-throughput optical monitoring of neural activity.
This digital holographic microscopy technique facilitates accurate, high-speed functional imaging.
The method is suitable for studying neuronal dynamics in various biological samples, including brain slices.