Scanning Microscope With Pulsed Illumination for Multi-Fluorophore Imaging
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Solution Overview
Problem
Existing scanning microscopes face challenges in efficiently imaging large specimens with multiple fluorophores due to difficulties in predicting exposure times, bleaching, and overlapping emission bands, especially in fluorescence microscopy, which requires separate scans for each fluorophore and results in under- or over-exposed images.
Innovation Solution
A scanning instrument using a pulsed illumination source synchronized with a computer-controlled scanning stage and a monochrome or color area detector array, combined with Moving Specimen Image Averaging (MSIA), allows simultaneous imaging of multiple fluorophores by adjusting exposure time through pulsed illumination and averaging pixel data to enhance signal-to-noise ratio and dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate scans are performed for each fluorophore, then exposure can be optimized for each fluorophore, but imaging time increases and fluorophore bleaching worsens
Solution Approach 1:
The illumination source emits light in periodic pulses at different wavelengths, with each pulse corresponding to a specific fluorophore excitation wavelength. The detector captures images synchronously with each pulse, enabling multiple fluorophores to be imaged in a single periodic scanning cycle rather than requiring separate scans for each fluorophore.
Solution Approach 2:
Multiple fluorophore imaging channels are merged into a single scan by using a pulsed illumination source that sequentially excites different fluorophores. The detector integrates signals from all fluorophores during one scan, combining what would traditionally require multiple separate scans into a single operation, thereby reducing total imaging time and minimizing fluorophore bleaching.
2Measurement precision
If separate scans are performed for each fluorophore, then exposure can be optimized for each fluorophore, but fluorophore bleaching increases
Solution Approach 1:
The illumination source emits light in periodic pulses at different wavelengths, with each pulse corresponding to a specific fluorophore excitation wavelength. The detector captures images synchronously with each pulse, enabling multiple fluorophores to be imaged in a single periodic scanning cycle rather than requiring separate scans for each fluorophore.
Solution Approach 2:
Multiple fluorophore imaging channels are merged into a single scan by using a pulsed illumination source that sequentially excites different fluorophores. The detector integrates signals from all fluorophores during one scan, combining what would traditionally require multiple separate scans into a single operation, thereby reducing total imaging time and minimizing fluorophore bleaching.
3Measurement precision
If exposure time is increased to improve signal-to-noise ratio, then image quality improves, but fluorophore bleaching worsens
Solution Approach 1:
The illumination source emits light in periodic pulses at different wavelengths, with each pulse corresponding to a specific fluorophore excitation wavelength. The detector captures images synchronously with each pulse, enabling multiple fluorophores to be imaged in a single periodic scanning cycle rather than requiring separate scans for each fluorophore.
Solution Approach 2:
The system changes the temporal parameter of illumination from continuous to pulsed, and adjusts the pulse duration and frequency to optimize exposure. By controlling the duty cycle and pulse width, the system achieves sufficient signal integration for high signal-to-noise ratio while limiting the total exposure time to prevent fluorophore bleaching.
4Loss of time
If multiple fluorophores are imaged simultaneously, then imaging time is reduced, but exposure control becomes more difficult
Solution Approach 1:
The illumination source emits light in periodic pulses at different wavelengths, with each pulse corresponding to a specific fluorophore excitation wavelength. The detector captures images synchronously with each pulse, enabling multiple fluorophores to be imaged in a single periodic scanning cycle rather than requiring separate scans for each fluorophore.
Solution Approach 2:
The system uses feedback control to adjust illumination intensity and detector gain for each fluorophore channel based on preliminary measurements or reference standards. This enables automatic optimization of exposure parameters for multiple fluorophores simultaneously, eliminating the need for manual adjustment and simplifying the imaging process.
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 method enables efficient, single-pass imaging of large specimens with multiple fluorophores, reducing bleaching and exposure time errors, and enhancing image quality by increasing signal-to-noise ratio and dynamic range without the need for separate scans for each fluorophore.
Implementation Method 1
A scanning instrument using a pulsed illumination source synchronized with a computer-controlled scanning stage and a monochrome or color area detector array, combined with Moving Specimen Image Averaging (MSIA), allows simultaneous imaging of multiple fluorophores
Data Source
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AI summary
According to one aspect, an instrument for scanning a specimen. The instrument includes a scanning stage for supporting the specimen, a detector having a plurality of pixels, the scanning stage and the detector movable relative to each other to move the specimen in a scan direction during a scan, and a pulsed illumination source synchronized with the motion of the specimen on the scanning stage. At least some of the pixels of the detector are operable to collect light emitted from the specimen during the scan due to the pulsed illumination source and generate corresponding image data. The instrument may further include a processor operable to perform MSIA on the image data to generate an image of the specimen.