Dual-Channel Laser Confocal Microscope Crosstalk Elimination
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Solution Overview
Problem
Existing dual-channel confocal microscope systems suffer from color-crosstalk issues due to the excitation of fluorescence signals by laser beams with different wavelengths, leading to inaccurate and unreliable dual-color imaging results.
Innovation Solution
A dual-channel laser confocal microscope system is designed to eliminate crosstalk by using dual-wavelength parallel laser beams with interleaved pulses, a scanning-imaging module for point-by-point fluorescence excitation and collection, and an acquisition module with dichroic mirrors and adjustable filters to separate and filter fluorescence signals, ultimately reconstructing confocal images without crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different wavelengths of laser are used to excite different fluorescent dyes for multi-color confocal imaging, then multi-color imaging capability is achieved, but color-crosstalk occurs between different detection channels
Solution Approach 1:
The patent employs periodic pulsed laser excitation with different repetition rates for different wavelengths (e.g., 40 MHz for 488nm laser, 20 MHz for 561nm laser). This periodic action with distinct frequencies allows temporal separation of excitation events, enabling the detection system to distinguish between different fluorescent channels and eliminate color-crosstalk while maintaining multi-color imaging capability
2Measurement precision
If sequential excitation and scanning by different wavelengths is used to achieve dual-color imaging, then color-crosstalk is reduced, but acquisition time is doubled
Solution Approach 1:
The patent implements continuous parallel scanning where multiple wavelengths excite the sample simultaneously during a single scan pass. The detection system continuously receives and temporally sorts fluorescence signals from different channels, maintaining continuous useful action throughout the scanning process. This eliminates the need for sequential scanning, reducing acquisition time while effectively eliminating color-crosstalk through temporal signal separation
3Productivity
If parallel scanning by different wavelengths is used for synchronous dual-color imaging, then acquisition time is reduced, but color-crosstalk between channels occurs
Solution Approach 1:
The patent uses periodic pulsed excitation with different repetition rates for different wavelengths during parallel scanning. The detection system employs temporal gating synchronized to these different pulse frequencies, allowing it to distinguish and separate fluorescence signals from different channels in real-time. This maintains the high imaging speed of parallel scanning while eliminating color-crosstalk through frequency-based temporal separation
Solution Approach 2:
The patent implements a feedback mechanism where the detection system monitors the temporal characteristics of fluorescence signals and uses this information to dynamically sort photons into the correct detection channels. The system feedbacks timing information from the interleaved pulse trains to the photon sorting algorithm, enabling real-time correction and accurate channel assignment, thus eliminating color-crosstalk while maintaining parallel scanning speed
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 effectively separates fluorescence signals by wavelength, eliminating color crosstalk and ensuring accurate dual-color imaging with faster imaging speed, allowing for simultaneous study of interaction between different subcellular organelles labeled with different fluorescent markers.
Implementation Method 1
laser module (4), which is connected to the delay signal generator (3) and configured to emit dual-wavelength laser beams under control of the delay signal generator (3)... converge the dual-wavelength parallel laser beams on a to-be-tested sample (14)... to excite fluorescence signals
Implementation Method 2
acquisition module (103)... configured to separate the fluorescence signals into different acquisition channels of the acquisition module (103), respectively
Data Source
AI summary
A dual-channel laser confocal microscope system for crosstalk elimination is provided, which includes an illumination module, a scanning-imaging module, an acquisition module and a control and reconstruction module. The illumination module is configured to emit dual-wavelength parallel laser beams. The scanning-imaging module is configured to scan the to-be-tested sample point by point to excite and collect the fluorescence signal. The acquisition module is configured to separate the fluorescence signals into different acquisition channels and complete the optical signal acquisition. The control and reconstruction module is configured to control the pulse interleaved excitation of the illumination module and scanning imaging, and is also configured to decouple and reconstruct the fluorescence signals in the different acquisition channels to obtain confocal images without crosstalk for different wavelengths.