Oblique Light Sheet Microscopy for Large Tissue Imaging
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Solution Overview
Problem
Existing light sheet microscopy techniques face limitations in imaging large, intact biological samples due to restricted imaging depth and sample size, as well as issues with photobleaching and phototoxicity.
Innovation Solution
The Light Sheet Theta Microscopy (LSTM) instrument employs obliquely arranged illumination light sheets from the same side as the detection objective, allowing for larger sample imaging with high uniform resolution and reduced photo-damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If light sheet microscopy uses orthogonal illumination and detection, then imaging depth is improved, but sample size limitation occurs due to light sheet penetration requirements
Solution Approach 1:
The patent changes the illumination geometry from orthogonal (perpendicular) to oblique (at an angle θ between 0-45 degrees). This dimensional change in the illumination angle allows the light sheet to penetrate deeper into the sample while maintaining the ability to illuminate large lateral areas, effectively resolving the contradiction between imaging depth and sample size
2Area of stationary object
If detection objective is positioned at 45 degrees to sample surface, then sample size limitation is reduced, but imaging depth decreases due to reduced effective working distance
Solution Approach 1:
The patent systematically varies the illumination angle θ as a controllable parameter, optimizing it to balance between sample size coverage and imaging depth. By adjusting this angular parameter, the system achieves both large sample area imaging and sufficient imaging depth, resolving the contradiction between these two parameters
3Area of stationary object
If light sheet penetrates deep into tissue for illumination, then large sample imaging is enabled, but photobleaching and phototoxicity increase
Solution Approach 1:
The oblique illumination geometry concentrates the light sheet energy more efficiently along the propagation direction, creating a more localized illumination region. This reduces the total light exposure to the sample while maintaining adequate illumination of the target plane, thereby reducing photobleaching and phototoxicity effects
4Measurement precision
If detection objective has high numerical aperture for feature discrimination, then resolution is improved, but working distance is reduced limiting sample access
Solution Approach 1:
By changing from orthogonal to oblique illumination geometry, the patent creates additional spatial freedom that allows high-NA detection objectives to be positioned with adequate working distance. The oblique angle separates the illumination and detection paths in a way that maintains both high resolution capability and sufficient sample access space
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
LSTM achieves high-resolution, uniform imaging across large samples with minimal photobleaching and phototoxicity, enabling imaging of thick biological tissues and large animal brains without the limitations of conventional light sheet microscopy.
Implementation Method 1
an illumination objective forms a light sheet
Implementation Method 2
an orthogonally arranged objective detects the emitted signal from the illuminated plane
Data Source
Figure 1A~2
Figure 3A~4B
Figure 5A
AI summary
Light Sheet Theta (LS-θ) Microscopy achieves large sample imaging capabilities without affecting the imaging depth or the image quality. An optical layout places a detection objective normal to the sample surface, while placing the illumination objectives that generate light sheets at an angle (theta) significantly smaller than 90 degrees. In this configuration, the light sheets enter from same side of the sample as the detection objective. The intersection of the light-sheet and the detection focal plane results in a line illumination-detection profile that is discriminated by a camera.