Multi-focal Light-sheet Microscopy with Wollaston Prism Structured Illumination
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Solution Overview
Problem
Conventional microscopy techniques face limitations in achieving high-resolution, three-dimensional imaging of thick cellular samples due to diffraction constraints, mechanical scanning issues, and the need for long data-acquisition times, which hinder the capture of dynamic biological processes and introduce distortions.
Innovation Solution
A multi-focal light-sheet structured illumination module using a Wollaston prism to generate tunable, axially-localized high-contrast structured illumination patterns, allowing simultaneous capture of 2D images from multiple planes within a 3D volume, employing incoherently-illuminated slits and a quasi-monochromatic light source to overcome diffraction limitations and achieve improved spatial and temporal resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wide-field microscopy is used to capture 3D structure by scanning sample volume axially, then 3D imaging capability is achieved, but acquisition speed becomes slow and mechanical scanning introduces distortions
Solution Approach 1:
The patent divides the single imaging task into multiple focal planes, with each sensor capturing a specific depth plane simultaneously. This segmentation of the imaging volume into discrete axial layers allows parallel capture of 3D information without mechanical scanning, resolving the contradiction between 3D imaging capability and acquisition speed.
Solution Approach 2:
The patent transitions from 2D single-plane imaging to 3D multi-plane imaging by adding the axial dimension through multiple sensors positioned at different focal depths. This dimensional expansion enables simultaneous capture of multiple z-planes, achieving 3D imaging capability without the slow mechanical scanning of conventional wide-field microscopy.
2Productivity
If multi-focal plane microscopy is used to image different sections using several sensors, then mechanical scanning is avoided, but imaging capability is limited by diffraction
Solution Approach 1:
The patent changes the illumination parameters by introducing structured illumination patterns (sinusoidal modulations) at multiple orientations and phases. This parameter modification enables the extraction of high-frequency spatial information that would otherwise be lost to diffraction limits, super-resolving the images beyond the conventional optical resolution barrier while maintaining fast multi-plane acquisition.
Solution Approach 2:
The patent employs periodic structured illumination patterns that modulate the excitation light intensity in a sinusoidal manner across the sample. By capturing multiple images with different illumination phases and orientations, the system retrieves high-frequency spatial information through computational reconstruction, overcoming diffraction limitations without sacrificing acquisition speed.
3Measurement precision
If conventional microscopy is used to image thick cellular samples, then diffraction limits spatial resolution, but high-resolution optically-sectioned images cannot be obtained
Solution Approach 1:
The patent modifies the illumination parameters by applying structured sinusoidal patterns at multiple orientations (0°, 60°, 120°) and phases. This parameter change enables the system to encode high-frequency spatial information into the illuminated sample, which is then captured by the multi-sensor array and computationally decoded to achieve both high spatial resolution and optical sectioning capability in thick samples.
Solution Approach 2:
The patent introduces structured illumination patterns as an intermediary between the light source and the sample. These patterns act as a spatial frequency modulator that encodes high-resolution information into the excitation light, enabling the retrieval of fine structural details from thick samples that would otherwise be obscured by diffraction and out-of-focus light.
4Loss of information
If light-sheet fluorescence microscopy is used to illuminate sample from side, then optical sectioning is achieved, but resolution is limited by diffraction and requires two objective lenses
Solution Approach 1:
The patent changes the illumination parameters by superimposing structured sinusoidal patterns onto the light-sheet illumination. This modification enables the system to encode high-frequency spatial information that would otherwise be filtered out by the optical transfer function, achieving super-resolution beyond the diffraction limit while maintaining the optical sectioning advantage of light-sheet microscopy with a single high-NA objective.
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 provides high-resolution, super-resolved images with optical-sectioning capability without mechanical scanning, reducing data-acquisition time and eliminating coherence noise, enabling accurate 3D imaging of live-cell specimens with enhanced spatial and temporal resolution.
Implementation Method 1
The illumination method of this invention employs a Wollaston prism, thereby allowing several axially-localized high-contrast structured illuminations patterns
Implementation Method 2
The illumination method of this invention employs a Wollaston prism
Implementation Method 3
These light-sheet structured patterns are generated by illuminating the Wollaston prism through the emerging spherical wavefront from a set of equidistant and parallel incoherently-illuminated slits
Implementation Method 4
Light-sheet fluorescence microscopy (LSFM) is an alternate technique that combines optical sectioning with multiple-view imaging to observe tissues and living organisms
Data Source
AI summary
A multi-focal light-sheet structured illumination system that can be implemented as a part of a commercial fluorescence microscope or a module that is adaptable to fit a number of commercially available microscopes. The system provides simultaneous capture of 2D images from multiple planes within a 3D volume, which are resolved laterally and axially to provide improved resolution along the three dimensions (x,y,z). A Wollaston prism allows several axially-localized high-contrast structured illumination patterns to be generated.