Line-scanning Spatiotemporal Focusing Microscopy System
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Solution Overview
Problem
Conventional two-photon fluorescence microscopes using point-scanning methods face challenges in rapidly imaging large fields of view due to decreased scanning speed, which limits their ability to capture high-resolution images efficiently.
Innovation Solution
A structured illumination microscopy imaging system based on line-scanning spatiotemporal focusing, utilizing a femtosecond laser, acousto-optic modulator, line-scanning component, chromatic dispersion component, collimating lens, and synchronous control component to generate sinusoidal structured light for improved resolution and contrast, while reducing excitation lights outside the focal plane through sinusoidal intensity modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If point-scanning manner is employed, then imaging resolution can be maintained, but scanning speed decreases as field of view increases
Solution Approach 1:
The patent segments the illumination pattern into multiple lines that can be scanned simultaneously or in rapid succession, rather than scanning point-by-point. This line-scanning approach divides the field of view into manageable segments that can be imaged faster while maintaining resolution through the structured illumination pattern.
Solution Approach 2:
The patent employs periodic sinusoidal modulation of the laser intensity combined with line scanning to create structured illumination patterns. This periodic action enables the system to encode spatial frequency information that can be decoded to achieve super-resolution while maintaining high scanning speeds across large fields of view.
2Area of stationary object
If field of view increases, then coverage area improves, but scanning speed decreases
Solution Approach 1:
The patent introduces temporal dimension through periodic intensity modulation of the laser beam, creating structured illumination patterns in space-time. This allows the system to encode additional spatial frequency information that can be used to achieve super-resolution without increasing scanning speed requirements, effectively adding a dimension to the imaging process.
Solution Approach 2:
The patent changes the temporal parameter of laser intensity from constant to periodically modulated, creating sinusoidal structured illumination patterns. This parameter change enables the system to extract higher spatial frequency information from the sample, achieving super-resolution while maintaining fast scanning speeds across large fields of view.
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 enhances imaging resolution and contrast by rapidly modulating light intensity and scanning, allowing for high-speed imaging of large fields of view with improved robustness against sample scattering, and facilitates the collection of spatial frequencies beyond the cut-off frequency, thereby overcoming limitations of conventional point-scanning methods.
Implementation Method 1
an acousto-optic modulator, configured to periodically modulate an intensity of a laser light from the femtosecond laser
Implementation Method 2
a chromatic dispersion component, configured to generate spatial chirped laser pulses
Implementation Method 3
a collimating lens, configured to converge components with different wavelengths dispersed by the chromatic dispersion component to propagate in parallel
Implementation Method 4
A two-photon fluorescence microscope images through nonlinear effects excited by a fluorescence light. The fluorescent light with a relative short wavelength may be produced by a laser light with a relative long wavelength
Data Source
AI summary
A microscopy imaging system is disclosed. The system includes: a femtosecond laser; an acousto-optic modulator, configured to periodically modulate an intensity of a laser light; a line-scanning component, configured to focus the laser light to form a line-shaped beam and to scan in a direction perpendicular to the line-shaped beam; a chromatic dispersion component, configured to generate spatial chirped laser pulses; a collimating lens, configured to converge components with different wavelengths dispersed by the chromatic dispersion component to propagate in parallel; a microscope component, configured to guide light passing through the collimating lens to illuminate the sample and capture a fluorescence image at a focal plane; and a synchronous control component, configured to synchronously control the acousto-optic modulator to modulate the intensity of the laser light, the line-scanning component to scan and the microscope component to capture fluorescence images, such that a reconstructed image is obtained according to the images.