3D Interferometric Lattice Light-Sheet Microscopy for Sub-Cellular Imaging
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Solution Overview
Problem
Current methods for live-cell imaging struggle to achieve high spatio-temporal resolution and high detection sensitivity, particularly in extracting high-resolution 4D information from weak and dynamic fluorescence signals.
Innovation Solution
The development of a 3D interferometric lattice light-sheet (3D-iLLS) imaging system, which combines 4Pi interferometry with selective plane illumination, uses two opposed detection lenses and an excitation lens orthogonal to them to deliver low excitation light levels and suppress background.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional light-sheet microscopy is used, then imaging speed and temporal resolution are improved, but axial resolution and detection sensitivity deteriorate
Solution Approach 1:
The patent merges 4Pi interferometry with lattice light-sheet microscopy to create a hybrid system that achieves both high axial resolution (comparable to confocal microscopy) and fast imaging speeds (comparable to light-sheet microscopy). The two opposed detection lenses are combined with orthogonal lattice excitation to achieve this synergistic effect.
Solution Approach 2:
The patent introduces a new dimensional approach by using two opposed detection lenses in an interferometric arrangement, adding axial interference information to the conventional light-sheet detection geometry. This enables resolution enhancement without sacrificing imaging speed.
2Speed
If conventional light-sheet microscopy is used, then imaging speed is improved, but detection sensitivity worsens
Solution Approach 1:
The patent combines the advantages of confocal microscopy (high detection sensitivity) with light-sheet microscopy (fast imaging speed) by implementing an interferometric detection scheme with two opposed lenses that enhances signal detection while maintaining rapid volumetric imaging capability.
3Measurement precision
If confocal microscopy is used, then axial resolution is improved, but imaging speed deteriorates
Solution Approach 1:
The patent transitions from point-by-point confocal scanning to a wide-field interferometric light-sheet approach, using the third dimension (axial interference) to achieve high resolution without mechanical scanning, thereby enabling fast volumetric imaging.
4Reliability
If epi-illumination is used, then detection sensitivity is improved, but background signal worsens
Solution Approach 1:
The patent inverts the conventional epi-illumination geometry by using orthogonal side-illumination with light-sheet excitation, which eliminates out-of-focus background while maintaining high detection sensitivity through the interferometric detection scheme.
5Illumination intensity
If high excitation light levels are used, then signal intensity is improved, but phototoxicity worsens
Solution Approach 1:
The patent merges the efficiency of confocal detection (high signal intensity) with the gentle illumination of light-sheet microscopy (low phototoxicity), achieving both strong fluorescence signals and reduced photodamage through interferometric detection of orthogonally excited light sheets.
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
3D-iLLS achieves improved axial resolution and single-particle localization precision, with axial resolution of approximately 100 nm (FWHM) and localization precision of less than 10 nm (1σ), facilitating the analysis of biological processes at the sub-cellular level.
Implementation Method 1
The light detection apparatus may comprise an interferometer configured to combine light received via the two opposed detection lenses
Implementation Method 2
the excitation lens may be configured to deliver lattice light-sheet (LLS) excitation to the sample from which fluorescence beams are detected
Implementation Method 3
The beam splitter may be arranged such that fluorescence beams from the two detection lenses interfere at the beam splitter
Data Source
AI summary
Disclosed is three-dimensional interferometric lattice light-sheet (3D-iLLS) imaging, an approach that overcomes limitations of prior microscopy techniques. 3D-iLLS provides, by virtue of selective-plane illumination (SPIM), low light levels and photobleaching, while providing increased background suppression and significantly improved volumetric imaging/sectioning capabilities through 4Pi interferometry. An example setup demonstrated 3D-iLLS with axial resolution and single-particle localization precision down to <100 nm (FWHM) and <10 nm (1σ), respectively. 3D-iLLS enables a fuller elucidation of sub-cellular phenomena by enhanced 4D resolution and improved SNR during live imaging.