Optogenetic ROI Illumination Using TDM Spatial Modulation
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Solution Overview
Problem
Existing optogenetic techniques face challenges in high-throughput, space- and time-resolved, and cell-type-specific control and monitoring of cellular activity due to limitations in microscopy modalities such as high cost, single-wavelength operation, and slow acquisition rates of conventional cameras.
Innovation Solution
Implementing a spatio-temporally modulated illumination using a time-division-multiplexed (TDM) scheme with digital micromirror devices (DMDs) for optogenetic systems, allowing simultaneous activation and monitoring of multiple regions of interest (ROIs) with synchronized pattern switching rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional pixel-based cameras are used to measure fluorescence signals from voltage reporters, then the system is simple and cost-effective, but the acquisition rate is too slow to capture fast membrane potential variations
Solution Approach 1:
The patent segments the illumination field into multiple independently controllable regions using digital micromirror devices (DMDs), allowing each region to be illuminated and detected separately at high speed. This segmentation enables the system to achieve high acquisition rates for voltage reporter measurements by focusing resources on specific regions of interest rather than attempting to capture entire fields simultaneously with conventional cameras.
Solution Approach 2:
The system employs dynamic spatial light modulation using DMDs that can rapidly reconfigure illumination patterns at high switching rates. This dynamic capability allows the system to adapt illumination and detection to match the temporal characteristics of fast voltage reporter signals, achieving the necessary acquisition rates while maintaining system flexibility.
2Productivity
If multiple regions of interest are activated and monitored simultaneously, then the throughput and efficiency improve, but the system complexity and cost increase
Solution Approach 1:
The patent merges multiple illumination and detection functions into a single integrated system using two synchronized DMDs. One DMD handles activation light spatial modulation while the other handles excitation light spatial modulation, allowing simultaneous multi-ROI activation and monitoring through coordinated operation rather than requiring separate systems for each function.
Solution Approach 2:
The DMD-based spatial light modulation system serves multiple functions: it can activate different ROIs with activation light, excite different ROIs with excitation light, and route emitted light from multiple ROIs to detectors. This multi-functional capability enables high-throughput simultaneous monitoring of multiple ROIs using a unified platform rather than requiring specialized equipment for each task.
3Adaptability or versatility
If single-wavelength operation is used, then the system is simpler, but the versatility for different optogenetic actuators and reporters is limited
Solution Approach 1:
The system enables wavelength flexibility by using DMDs that can spatially modulate multiple wavelengths of light independently. The activation light source and excitation light source can be tuned to different wavelengths to match various optogenetic actuators and reporters, and the DMDs can independently control the spatial distribution of each wavelength to accommodate different experimental requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-throughput, space- and time-resolved control and monitoring of cellular activity, improving the efficiency and versatility of optogenetic systems by enabling parallel activation and detection of multiple ROIs.
Implementation Method 1
The activation light and the excitation light may have illumination spectra that are different from each other. The activation light may be used to activate optogenetic actuators disposed in the specimen to cause conformational changes in the actuators
Implementation Method 2
The excitation light may be used to excite optogenetic reporters disposed in the specimen. The optogenetic reporters may be configured to emit fluorescence light when cell activity is stimulated or inhibited through optical activation
Implementation Method 3
The system may also include a spatial light modulator configured to spatially modulate the activation light and the excitation light to produce spatially patterned activation and spatially patterned excitation
Data Source
AI summary
Optogenetic systems and methods for probing a specimen using spatio-temporally modulated illumination light are disclosed. A method may include generating illumination light, the illumination light including a plurality of illumination protocols temporally sampled and interleaved with one another at a time-division-multiplexed (TDM) sampling rate, each illumination protocol being for illuminating a respective region of interest (ROI) of a plurality of ROIs of the specimen. The illumination light may include either activation or excitation light, or both. The method may also include applying a spatio-temporal modulation to the illumination light and directing the resulting modulated illumination light onto the specimen. The modulation may include repeatedly imparting, at a pattern switching rate matched and synchronized with the TDM sampling rate, a sequence of a plurality of spatial modulation patterns to the plurality of temporally sampled and interleaved illumination protocols, each spatial modulation pattern mapping to a respective one of the ROIs.