Multi-focal SIM Microscopy Beam Splitting for Resolution and Noise
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Solution Overview
Problem
Current microscopy techniques, such as confocal and structured illumination microscopy, face limitations in achieving high resolution without sacrificing scanning speed or signal strength, particularly when dealing with thick or highly stained samples, where shot noise and crosstalk issues arise.
Innovation Solution
A multi-focal structured illumination microscopy system that generates a multi-focal excitation pattern using a single light beam split into multiple beams, with a scanner to create focal points on the sample, a focusing component to block out-of-focus emissions, and a processing system to scale and sum in-focus emissions for enhanced resolution and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If confocal microscopy uses a tightly closed pinhole to eliminate out-of-focus emission light, then optical resolution beyond the diffraction limit is achieved, but the signal level of emitted light is diminished to impractical levels
Solution Approach 1:
The patent divides the single light beam into multiple beams using a beam splitter, creating multiple focal points that simultaneously illuminate different regions of the sample. This segmentation allows parallel acquisition of multiple confocal images, increasing the effective signal level while maintaining resolution enhancement through subsequent image processing and deconvolution.
Solution Approach 2:
The patent combines multiple confocal images acquired simultaneously from different spatial locations into a single composite image. By merging the signal from multiple detectors or image channels, the system recovers signal levels that would be insufficient in traditional single-point confocal microscopy, while maintaining super-resolution through deconvolution algorithms.
2Measurement precision
If confocal microscopy uses a tightly closed pinhole to achieve super-resolution, then resolution is improved, but misalignment between excitation beam and pinhole/detector causes reduced light signal
Solution Approach 1:
By segmenting the illumination into multiple beams and using an array of detectors, the system creates multiple aligned detection channels that are less sensitive to misalignment. The parallel architecture distributes the alignment requirements across multiple channels, reducing the criticality of perfect alignment compared to single-point confocal systems.
Solution Approach 2:
The patent creates multiple copies of the confocal detection system through the array of detectors, where each detector or detector element processes a portion of the multi-focal pattern. This redundancy provides tolerance against misalignment, as the overall image can be reconstructed even if individual channels experience slight alignment variations.
3Measurement precision
If structured illumination microscopy uses spatially modulated excitation to achieve double the lateral resolution, then resolution is improved, but temporal resolution is sacrificed due to multiple raw images required
Solution Approach 1:
The patent segments the illumination pattern into multiple focal points that can be simultaneously activated, allowing parallel acquisition of multiple spatial samples within a single excitation cycle. This multi-focal approach maintains the resolution enhancement benefits of SIM while reducing the number of sequential pattern acquisitions needed.
Solution Approach 2:
The system performs preliminary spatial sampling across multiple focal points simultaneously within each illumination cycle, rather than sequentially scanning through patterns. This preliminary parallel acquisition reduces the total number of cycles required to achieve the same resolution enhancement, improving temporal resolution.
4Measurement precision
If structured illumination microscopy performs computational optical sectioning, then out-of-focus blur rejection is achieved, but shot noise from background fluorescence overwhelms the in-focus signal in thick samples
Solution Approach 1:
By dividing the sample into multiple illuminated focal regions simultaneously, the system collects signal from in-focus planes at different depths in parallel. The multi-focal confocal architecture inherently provides optical sectioning at each focal point, and the combined images maintain higher signal-to-noise ratios compared to computational sectioning of single wide-field images.
Solution Approach 2:
The patent creates multiple copies of the confocal detection process across different focal points and detector elements. This multi-channel confocal approach provides inherent optical sectioning through the pinhole aperture at each channel, physically rejecting out-of-focus light before detection and eliminating shot noise from background fluorescence that plagues computational SIM methods.
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
The system achieves high-resolution imaging at high scanning rates with minimal signal loss, capable of handling thicker samples and reducing shot noise, resulting in improved image quality and resolution compared to conventional methods.
Implementation Method 1
a beam splitter for splitting the single light beam into a plurality of light beams forming a multi-focal pattern
Implementation Method 2
a scanner scans the plurality of light beams that forms the multi-focal pattern onto a sample
Implementation Method 3
the sample generates a plurality of fluorescent emissions resulting from each multi-focal pattern
Implementation Method 4
a focusing component then defines an aperture configured to physically block out-of-focus fluorescence emissions of the plurality of fluorescent emissions
Data Source
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AI summary
A multi-focal selective illumination microscopy (SIM) system for generating multi-focal patterns of a sample is disclosed. The multi-focal SIM system performs a focusing, scaling and summing operation on each multi-focal pattern in a sequence of multi-focal patterns that completely scan the sample to produce a high resolution composite image.