Fluorescence Imaging Randomized Pinhole Mask Sequence
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Solution Overview
Problem
Conventional fluorescence imaging systems suffer from photobleaching, leading to uneven brightness across a sample due to over-illumination, which causes periodic visual artifacts in composite confocal images, affecting both qualitative and quantitative analysis.
Innovation Solution
A fluorescence imaging system that determines the physical locations of a pinhole mask relative to a sample, generates a randomized order for these locations, and adjusts image brightness based on a model of observed imaging effects to eliminate these artifacts, using a control module, motors, and sensors to capture and process images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a systematic order is used to capture images at discrete intervals, then the image capture process is efficient and straightforward, but periodic visual artifacts appear in the composite confocal image due to photobleaching
Solution Approach 1:
The system performs preliminary actions by capturing images in a randomized order rather than a systematic sequence. This preliminary randomization prevents periodic visual artifacts caused by photobleaching before composite image generation, eliminating the need for complex post-processing artifact removal while maintaining image quality
Solution Approach 2:
The invention changes the parameter of image capture sequence from systematic to randomized. By altering this procedural parameter, the system eliminates periodic visual artifacts inherent in systematic capture methods, achieving improved image quality without requiring complex artifact correction algorithms
2Illumination intensity
If excitation light is applied to illuminate the sample, then fluorescence signal is generated for imaging, but photobleaching occurs causing uneven brightness and visual artifacts
Solution Approach 1:
The system applies periodic action by using pulsed or intermittent illumination rather than continuous excitation light. This approach allows the sample to recover between illumination pulses, reducing cumulative photobleaching damage while maintaining sufficient fluorescence signal for high-quality imaging
Solution Approach 2:
The invention converts the harmful effect of photobleaching into a benefit by using it to guide adaptive illumination strategies. Areas that show signs of photobleaching receive reduced or no further illumination, while under-illuminated areas receive additional excitation, ultimately producing a composite image with uniform brightness and no visual artifacts
3Measurement precision
If multiple images are captured and combined using a fixed algorithm, then a composite confocal image is generated with improved resolution, but visual artifacts from photobleaching are amplified
Solution Approach 1:
The system implements feedback by measuring the brightness and quality of captured images in real-time and using this information to adjust subsequent illumination and capture parameters. This feedback mechanism ensures that images contributing to the composite are of high quality and uniformly illuminated, preventing photobleaching artifacts from being amplified in the final image
Solution Approach 2:
The invention introduces dynamics by making the image capture and combination process adaptive rather than static. The system dynamically adjusts illumination intensity, capture timing, and combination weighting based on real-time observations of sample response and photobleaching patterns, resulting in composite images with improved resolution and eliminated artifacts
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 reduces periodic visual artifacts by capturing images in a randomized order and adjusting brightness, resulting in improved image quality and reduced photobleaching effects, enhancing the accuracy and reliability of fluorescence imaging.
Implementation Method 1
In single-point confocal systems the illumination used to excite the dye is passed through a pinhole onto the sample, then the fluorescent emission from the sample is passed through another pinhole into a photodetector. The pinhole size and optics are designed to accept light back from only those photons emitted from the thin slice of the sample that is in focus.
Implementation Method 2
The light 802 is absorbed by fluorophores, which causes them to emit light 816
Data Source
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AI summary
A method for generating a composite image obtained in a fluorescence imaging system, comprising: determining the physical locations of a pinhole mask relative to a sample required to construct a full composite confocal image; generating in a control module a randomized order for the determined physical locations; moving the photomask or the sample to the determined physical locations in the randomized order under control of the control module and using a translation stage; illuminating the sample through the photomask using an excitation light; capturing a plurality of images at each of the physical locations using a sensor in order to generate a set of data points; using the randomized order to generate a composite image based on the set of data points and measuring the brightness of at least some of the data points; and adjusting the brightness of some of the set of data points.