Ultrathin Light Sheet Imaging for Fast High-Resolution 3D Cell Scans
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Solution Overview
Problem
Current optical techniques for high-resolution 3D biological imaging, such as confocal microscopy and light sheet imaging, suffer from low spatial resolution along the optical axis, slow imaging speed, and require specialized lenses and mechanical stages, making them unsuitable for rapid biomedical testing.
Innovation Solution
A far-field optical ultrathin light sheet imaging system using a laser device, beam modulation module, objective lens, microfluidic chip, and imaging device to generate ultrathin light sheets with high spatial resolution and fast imaging speed by modulating a single laser beam into a Bessel-Gaussian spot array and controlling fluid flow with a microfluidic chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scanning microscopes (confocal, stimulated emission depletion) are used for biological imaging, then high-resolution measurement of 3D structure is achieved, but imaging speed becomes slow due to line-by-line scanning
Solution Approach 1:
The patent segments the single laser beam into multiple parallel beams using a beam splitter and spatial light modulator, creating multiple illumination spots that scan simultaneously across different regions of the sample. This parallel processing approach maintains high spatial resolution while dramatically improving imaging speed by acquiring multiple lines or planes concurrently rather than sequentially
Solution Approach 2:
The patent introduces a temporal dimension to the imaging process by rapidly switching between multiple pre-positioned beams and utilizing the fast scanning capability in the fast scanning direction. This transforms the traditional 2D spatial scanning into a 3D space-time optimization, where multiple spatial positions are illuminated and detected in rapid succession, effectively increasing imaging throughput without sacrificing resolution
2Measurement precision
If confocal or stimulated emission depletion microscopy is used, then 3D structure measurement is achieved, but spatial resolution along the optical axis deteriorates due to depth of focus influence
Solution Approach 1:
The patent divides the optical axis into multiple discrete focal planes and uses independent beams focused at each plane to illuminate and detect fluorescence simultaneously. This segmentation of the depth dimension allows each beam to maintain optimal focus at its designated plane, achieving high spatial resolution along the optical axis that would be impossible with a single beam subject to depth of focus limitations
Solution Approach 2:
The patent creates a multi-functional imaging system where a single optical path can simultaneously perform high-resolution imaging at multiple depth levels. Each beam serves multiple purposes: illumination, fluorescence excitation, and detection at its specific focal plane, enabling the system to capture 3D structural information with high precision along the optical axis without requiring separate microscopy techniques for different depth ranges
3Productivity
If light sheet imaging technique is used to improve imaging speed, then faster 3D imaging is achieved, but specialized lenses and mechanical translation stages are required, increasing device complexity
Solution Approach 1:
The patent creates a multi-functional optical system where the objective lens performs multiple roles: it focuses each beam at a different plane along the optical axis, serves as the detection objective for fluorescence collection, and enables rapid scanning in the fast scanning direction. This eliminates the need for separate specialized light sheet lenses and mechanical translation stages, reducing device complexity while maintaining fast 3D imaging capability
Solution Approach 2:
The patent replaces the mechanical translation stage with an optical scanning system using spatial light modulator and fast scanning mirrors. Instead of physically moving the sample or detector through space to achieve z-stack imaging, the system uses rapidly switchable optical beams to illuminate and detect at different focal planes, substituting mechanical motion with optical switching that is faster and requires no physical translation hardware
4Manufacturing precision
If light sheet thickness is reduced to micrometer order for high resolution, then spatial resolution improves, but working distance decreases and specially designed lenses are required
Solution Approach 1:
The patent segments the illumination into multiple thin light sheets, each with micrometer-order thickness for high spatial resolution. By using multiple segmented beams instead of a single thick light sheet, the system achieves high resolution while maintaining a longer effective working distance, as each individual beam can be focused independently at different depths without requiring the sample to be positioned extremely close to the 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
Enables continuous, high-resolution, and high-throughput light sheet imaging of biological samples, suitable for fast 3D reconstruction and biomedical applications like biophysics and cancer cell screening.
Implementation Method 1
the beam modulation module modulates the incident single laser beam, and the incident single laser beam is incident on a pupil aperture plane of the objective lens; the objective lens focuses the incident beam on the pupil aperture plane, converging the incident beam to generate an ultrathin light sheet
Implementation Method 2
the microfluidic chip controls a flow of fluorescent dyes through the control box of the microfluidic chip; the control box of the microfluidic chip controls a flow of fluorescently labeled cell samples
Implementation Method 3
fluorescence emitted by the cells is collected onto the imaging device through the narrow bandpass filter and the imaging lens
Data Source
AI summary
A far-field optical ultrathin light sheet imaging system and method are provided. The imaging system comprises a laser device, a beam modulation module, an objective lens, a control box of the microfluidic chip, a microfluidic chip, a narrow bandpass filter, an imaging lens, and an imaging device, wherein the beam modulation module modules a single laser beam emitted by the laser device, and the single laser beam is incident on a pupil aperture plane of the objective lens and then being converged to generate an ultrathin light sheet inside a channel of the microfluidic chip; the microfluidic chip controls a flow of fluorescently labeled cell samples through the control box of the microfluidic chip; fluorescence emitted by the cells is collected onto the imaging device through the narrow bandpass filter and the imaging lens.