Multiphoton Microscopy Single Detector Signal Integration
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Solution Overview
Problem
Conventional multiphoton microscopy systems face challenges with slow imaging rates, complex optical setups, and reduced signal strength due to the use of multiple detectors and optical components, which lead to blurred images and prolonged imaging times, especially when switching between different imaging modes.
Innovation Solution
A multiphoton microscopy system with a single detector capable of integrating multiple multiphoton signals at different wavelengths, utilizing a resonant scanner and a simplified optical path that eliminates the need for secondary dichroic mirrors and filters, allowing for real-time optimization of excitation wavelengths and increased signal sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple detectors and optical components are used to detect different multiphoton signals, then measurement precision is improved, but device complexity increases and signal strength decreases
Solution Approach 1:
The patent combines multiple detection functions into a single detector by using a spectral splitter that separates different wavelength ranges and directs them to the same detector. This merging approach maintains the ability to detect different multiphoton signals (TPF, SHG, THG) while eliminating the need for multiple separate detectors and their associated optical components, thereby reducing device complexity and optical path length.
Solution Approach 2:
The single detector is designed to handle multiple imaging modes universally. The spectral splitter enables one detector to perform the functions of multiple detectors by routing different wavelength bands to the detector at different times or simultaneously, allowing the system to detect TPF, SHG, and THG signals without requiring mode-specific detection hardware.
2Measurement precision
If multiple optical components are placed in the light path to separate signals, then measurement precision is improved, but loss of energy increases due to absorption and reflection
Solution Approach 1:
By merging multiple signal detection paths into a single optical path that leads to one detector, the system minimizes the number of optical interfaces. The spectral splitter uses reflective and transmissive properties to direct different wavelengths to the same detector with minimal loss, avoiding the energy losses that would occur at multiple separate detector interfaces.
Solution Approach 2:
The patent extracts only the essential wavelength separation function needed for signal discrimination, implementing it through a spectral splitter rather than through multiple complex optical component assemblies. This extraction approach removes unnecessary optical components that would otherwise cause energy loss through absorption and reflection.
3Measurement precision
If conventional MPM systems use dedicated PMTs for each imaging mode, then measurement precision is improved, but productivity decreases due to slow imaging rates
Solution Approach 1:
The system merges multiple imaging mode detection into a single detector setup, which enables faster frame rates. The spectral splitter rapidly directs different wavelength signals to the single detector without the mechanical switching or sequential detection required by multiple dedicated PMTs, achieving imaging rates of 100-1000 fps compared to conventional slower rates.
Solution Approach 2:
The spectral splitter dynamically routes different wavelength signals to the detector based on the imaging mode being used, allowing rapid switching between TPF, SHG, and THG imaging without physical component changes. This dynamic routing maintains measurement precision while enabling high-speed imaging capable of capturing real-time physiological processes.
4Measurement precision
If optical components such as mirrors and filters are used to separate signals, then measurement precision is improved, but device complexity increases and requires component changes for wavelength switching
Solution Approach 1:
The spectral splitter is designed as a universal wavelength routing component that can direct multiple wavelength bands (corresponding to different multiphoton signals) to the single detector. This universal design eliminates the need to change or adjust optical components when switching between imaging modes, as the spectral splitter inherently handles all required wavelength separations through its fixed optical architecture.
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
This approach enables faster imaging rates, reduced blurring, and improved diagnostic efficiency by enhancing signal sensitivity and operator convenience, while allowing for real-time switching between imaging modes without the need to adjust complex optical components.
Implementation Method 1
A multiphoton microscopy system with a single detector capable of integrating multiple multiphoton signals at different wavelengths, utilizing a resonant scanner
Implementation Method 2
an objective for irradiating the sample with the excitation beam scanned by the scanner and for collecting an emission beam from the sample
Implementation Method 3
Multiphoton fluorescence occurs when two or more photons of relatively lower energy are simultaneously absorbed by and excite a fluorophore, causing emission of a fluorescence photon at a higher energy than the excitation photons
Implementation Method 4
Sum frequency generation occurs when two or more photons interact with a nonlinear material and combine to form a new photon with a multiple of the frequency and a fraction of the wavelength of the initial photons
Data Source
AI summary
A multiphoton microscope is provided. The microscope includes: an excitation source for providing an optical excitation beam at an excitation wavelength λ; a scanner for scanning the excitation beam on a sample; an objective for irradiating the sample with the excitation beam scanned by the scanner and for collecting an emission beam from the sample; a first detector for detecting a plurality of multiphoton signals; and an emission light path allowing transmission from the objective to the first detector a wavelength band limited to greater than or equal to λ/2 and less than λ, wherein the plurality of multiphoton signals have wavelengths within the wavelength band; wherein the plurality of multiphoton signals com-prises a first multiphoton signal and a second multiphoton signal of different types. Fast image capture rate multiphoton microscopes for in vivo imaging, as well as photothermolysis methods using the microscopes are also provided.