Frequency-Modulated Illumination for Multi-Color Super-Resolution Microscopy
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Solution Overview
Problem
Existing multi-color super-resolution microscopy techniques face limitations due to color cross-talk, unavailability of spectrally distinct photo-switchable fluorophores, and long acquisition times, which hinder the practical application of multi-color imaging in biology.
Innovation Solution
The method employs frequency-modulated illumination, where electromagnetic radiation with different wavelengths is modulated with distinct frequencies, allowing for simultaneous multi-color imaging without the need for spectral filtering, enabling higher signal throughput and reduced acquisition time by shifting measurements to the frequency domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sequential multi-color imaging is used, then color cross-talk is reduced, but acquisition time increases significantly
Solution Approach 1:
The patent applies periodic action by modulating each excitation wavelength at a distinct frequency, creating periodic intensity variations that encode color information. This allows simultaneous multi-color imaging because each fluorophore's emission contains frequency-encoded information that can be decoded independently, eliminating the need for sequential imaging while maintaining color discrimination accuracy.
Solution Approach 2:
The patent transitions from time-domain sequential imaging to frequency-domain parallel imaging by adding the frequency dimension. Instead of separating colors in time (sequential acquisition), the invention separates colors in frequency space, allowing all colors to be acquired simultaneously and then distinguished through frequency analysis.
2Measurement precision
If spectral filtering is used for multi-color imaging, then color discrimination is achieved, but signal throughput is reduced
Solution Approach 1:
The patent extracts color information from the frequency domain rather than using spectral filtering in the optical path. By removing spectral filters and instead using frequency modulation and demodulation, the system captures the full emission spectrum for each fluorophore without loss, then separates colors computationally through frequency analysis.
Solution Approach 2:
The patent replaces the mechanical/optical spectral filtering system with an electronic frequency modulation and demodulation system. Instead of using physical filters to separate wavelengths, the invention uses electronic control of excitation frequencies and corresponding demodulation to achieve color separation, thereby maximizing signal throughput.
3Measurement precision
If spectrally distinct photo-switchable fluorophores are used, then color cross-talk is minimized, but availability of suitable fluorophores is limited
Solution Approach 1:
The patent changes the parameter used for color discrimination from spectral properties (wavelength) to temporal properties (modulation frequency). This allows the use of any fluorophores with distinct excitation spectra rather than requiring rare photo-switchable fluorophores, significantly expanding the available fluorophore selection while maintaining color cross-talk reduction.
4Loss of time
If camera field-of-view is split into sub-regions for simultaneous multi-color imaging, then acquisition time is reduced, but experimental throughput is reduced
Solution Approach 1:
The patent makes the full camera field-of-view serve multiple color channels simultaneously through frequency multiplexing. Instead of dividing the field-of-view into sub-regions for different colors, the entire field captures all colors at once, with color information encoded in the frequency domain, thereby maintaining both fast acquisition and high experimental throughput.
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 achieves high-resolution multi-color imaging with improved throughput and accuracy, reducing color cross-talk and acquisition time, enabling faster imaging speeds while maintaining high image resolution comparable to or exceeding conventional methods.
Implementation Method 1
modulating each wavelength with a different modulation frequency
Implementation Method 2
sensing electromagnetic radiation emitted from the target, in particular the luminescence, more in particular the fluorescence
Data Source
AI summary
The disclosure relates to a method and an imaging device for multi-color imaging using frequency-modulated illumination. The method comprises a step of providing electromagnetic radiation with a plurality of different wavelengths, comprising a step of modulating each wavelength with a different modulation frequency, a step of illuminating a target with the modulated electromagnetic radiation, in particular for excitation of a target, a step of sensing electromagnetic radiation emitted from the target, in particular the luminescence, more in particular the fluorescence, and a step of processing the data obtained in the step of sensing.