Single-Molecule Microscopy With Dynamic Patterned Illumination
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Solution Overview
Problem
Conventional single-molecule localization microscopy (SMLM) techniques like PAINT are limited by high background noise and slow acquisition speed, especially when imaging at depth in conventionally mounted samples.
Innovation Solution
Implementing dynamic masking with a spatial light modulator (SLM) for patterned illumination, combined with confocal optical sectioning, to enhance signal-to-background ratio and acquisition speed by selectively illuminating regions containing fluorescent emitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If widefield detection is used for SMLM at depth, then single molecule localizations can be achieved, but background light contamination increases and acquisition speed is limited
Solution Approach 1:
The patent segments the field of view into multiple regions of interest (ROIs) based on detected emitter positions. By applying patterned illumination only to these specific ROIs rather than the entire field, the system reduces background light contamination while maintaining localization precision. This segmentation allows parallel monitoring of multiple regions, improving acquisition speed without sacrificing measurement precision.
2Measurement precision
If confocal optical sectioning is used to reduce out-of-focus background, then signal-to-background ratio improves, but device complexity increases
Solution Approach 1:
The patent introduces a spatial light modulator (SLM) as an intermediary device to generate patterned illumination. The SLM modulates the excitation light based on detected emitter positions, creating regions of enhanced illumination only where needed. This intermediary approach achieves confocal-like optical sectioning and background reduction without requiring a fully complex confocal microscope setup, balancing signal-to-background improvement with manageable device complexity.
3Measurement precision
If patterned illumination with SLM is implemented, then signal-to-background ratio increases, but device complexity and cost increase
Solution Approach 1:
The patent implements dynamic patterned illumination that adapts in real-time based on detected emitter positions. The illumination pattern is continuously updated to match the spatial distribution of fluorescent emitters, creating regions of enhanced illumination only where needed. This dynamic approach maximizes signal-to-background ratio while minimizing the illumination area, thereby reducing overall system complexity compared to static or full-field illumination methods.
4Measurement precision
If sparse detection is used to limit background contamination, then background light is reduced, but acquisition speed is limited
Solution Approach 1:
The patent performs preliminary detection of emitter positions using initial widefield imaging to identify regions of interest. Based on this preliminary information, the system pre-configures patterned illumination to target specific ROIs before正式 acquisition begins. This preliminary action allows the system to transition from sparse detection to targeted parallel monitoring of multiple regions, thereby reducing background contamination while significantly improving acquisition speed through parallel processing of multiple ROIs.
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
Achieves a several-fold improvement in signal-to-background ratio and acquisition speed by reducing out-of-focus background light, enabling faster and more precise single molecule localization.
Implementation Method 1
modulating excitation light from at least one light source to establish patterned illumination based on the regions
Implementation Method 2
a solution containing a fluorophore-labeled probe is applied to a biological sample. SMLM with PAINT is then achieved by recording a series of microscopic images of the sample
Implementation Method 3
confocal optical sectioning using a spinning disk or a programable array microscope (PAM), allowing for faster acquisition
Data Source
AI summary
Methods for single molecule localization microscopy may use a patterned illumination over the field of view. The patterned illumination may be dynamically adapted to the approximate positions of the detected fluorescent molecule emitters, allowing for increased signal-to-background for their single molecule localization.