Super-resolution imaging using multi-wavelength dye activation
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Solution Overview
Problem
Current high spatial resolution imaging methods, such as RESOLFT, PALM, and STORM, face limitations due to the rarity and sensitivity of switchable fluorescent dyes, which are mutually competitive and have limited brightness, making it difficult to achieve high spatial resolution imaging of structures in specimens.
Innovation Solution
A method that selects substances which can be repeatedly switched between two states, with at least 10% of molecules in each state being at a distance greater than the spatial resolution limit from their neighbors, allowing for precise determination of molecule positions using a sensor array, and utilizing non-switchable fluorescent dyes by converting them into a dark state for improved resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If switchable fluorescent dyes are used for high spatial resolution imaging, then resolution beyond diffraction limit is achieved, but the dyes are rare, sensitive, and have limited brightness
Solution Approach 1:
The patent changes the fundamental parameter of the fluorescent marker from switchable dyes to non-switchable dyes, while compensating by changing the illumination parameter to use multiple wavelengths. This allows the use of abundant, stable non-switchable dyes while achieving super-resolution through multi-wavelength illumination that selectively activates subsets of dyes in each frame.
Solution Approach 2:
The patent creates multiple copies of the imaging process by using multiple wavelengths of illumination simultaneously. Each wavelength activates a different subset of fluorescent dyes, creating parallel copies of the same structure imaged through different spectral channels, thereby achieving high resolution without relying on the rarity of switchable dyes.
2Quantity of substance
If the intensity of switching signal is increased to convert more molecules into the second state, then more molecules are available for imaging, but molecules closer than the spatial resolution limit from neighbors cannot be separated
Solution Approach 1:
The patent segments the population of fluorescent dyes into multiple spectrally distinct subsets using multi-wavelength illumination. Each wavelength activates a different segment of the dye population, allowing independent imaging of each segment with sufficient spacing to avoid overlap, while all segments together provide complete coverage of the structure.
Solution Approach 2:
The patent adds a spectral dimension to the imaging process by using multiple wavelengths simultaneously. This spectral dimension allows separation of molecules that are spatially close but have different activation characteristics, enabling high spatial resolution even when molecules are densely packed.
3Reliability
If non-switchable fluorescent dyes are used, then availability and stability improve, but spatial resolution beyond diffraction limit cannot be achieved
Solution Approach 1:
The patent changes the illumination parameter from single-wavelength to multi-wavelength illumination to compensate for using non-switchable dyes. By selectively activating different subsets of dyes with different wavelengths, the system achieves super-resolution capability while using the abundant and stable non-switchable dye molecules.
4Measurement precision
If multiple wavelengths of light are used to activate different subsets of dyes, then spatial resolution improves, but the complexity of the imaging system increases
Solution Approach 1:
The patent merges multiple imaging functions into a single simultaneous operation by using multi-wavelength illumination that activates different dye subsets in parallel. This combines what would traditionally require sequential imaging steps into one unified measurement process, reducing overall system complexity despite the advanced capabilities.
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 imaging with a resolution finer than the diffraction limit by isolating and determining the positions of individual molecules with high accuracy, even with conventional non-switchable dyes, by controlling the intensity and state of the fluorescent dyes to separate their signals effectively.
Implementation Method 1
selecting a substance from a group of substances which can be converted repeatedly by a switching signal from a first state into a second state, which can return from the second state into the first state, and which provide an optical measurement signal in one of their first and second states only
Implementation Method 2
converting the substance into the second state by the switching signal... converting fractions of the substance into the second state by the switching signal
Data Source
AI summary
For imaging of a structure, the structure is marked with a substance which can be converted by a switching signal from a first into a second state, and which provides an optical measurement signal in one of its states, only. The switching signal is applied such that at least 10% of the molecules of the substance being in the measurement signal providing state are at a distance from their closest neighbors, which is greater than the spatial resolution limit of imaging the specimen onto a sensor array, which in turn is greater than an average distance between the molecules of the substance. From an intensity distribution of the measurement signal recorded with the sensor array, the position is only determined for those molecules of the substance which are at a distance from their closest neighboring molecules in the measurement signal providing state, which is greater than the spatial resolution limit.