Fluorescence Microscopy Super-Resolution via Spatial Modulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fluorescence laser scanning microscopes (LSMs) face challenges in visualizing super-resolution components due to reduced detection efficiency when attempting to achieve super-resolution, as the pinhole diameter needs to be smaller than the Airy disk diameter to exceed the optical system's cut-off frequency, leading to weak detection of high-frequency components.
Innovation Solution
A sample observation apparatus that includes an excitation light irradiation unit, modulation unit, and image processing unit to generate and emphasize high-frequency components beyond the cut-off frequency, utilizing a galvano mirror for spatial intensity modulation and a convolution filter to enhance image data, allowing for visualization of super-resolution components without significant reduction in detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pinhole diameter is made smaller than the Airy disk diameter to achieve super-resolution, then the resolution exceeds the cut-off frequency of the optical system, but the amount of fluorescent light detected by the detector decreases
Solution Approach 1:
The patent changes the parameter of pinhole diameter to a specific range (0.5-2.0 times the Airy disk diameter) to simultaneously achieve super-resolution and maintain adequate detection efficiency, resolving the contradiction between resolution improvement and light loss
Solution Approach 2:
The patent applies preliminary action by pre-processing the detected image data through deconvolution algorithms and iterative reconstruction methods to enhance super-resolution components before final image generation, allowing the use of larger pinhole diameters while still achieving high resolution
2Loss of energy
If the pinhole aperture diameter is set to a diameter on the order of the Airy disk diameter to maintain detection efficiency, then the detection efficiency is prioritized, but the super-resolution component cannot be effectively obtained
Solution Approach 1:
The patent optimizes the pinhole diameter parameter to fall within 0.5-2.0 times the Airy disk diameter, which is a broader range than conventional settings, allowing simultaneous achievement of both detection efficiency and super-resolution capability
Solution Approach 2:
The patent replaces purely mechanical optimization (pinhole size adjustment) with a combination of optical parameter optimization and computational image processing, using algorithms like deconvolution and iterative reconstruction to enhance super-resolution components in the final image
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 apparatus effectively visualizes super-resolution components by increasing the cut-off frequency and emphasizing high-frequency components, achieving high-resolution imaging while maintaining detection efficiency, allowing for real-time display and storage of super-resolution images.
Implementation Method 1
a photo detection unit to detect light emission from the sample caused by irradiation with the excitation light
Implementation Method 2
light that is condensed to one spot on a sample is moved by a scanning unit such as a galvano mirror to scan the sample
Data Source
AI summary
A sample observation apparatus includes excitation light irradiation unit to irradiate sample with excitation light; excitation light modulator to modulate spatial intensity distribution of the excitation light on the sample; excitation light modulation control unit to control the excitation light modulator according to modulation control signal; photo detection unit to detect light emission from the sample and to generate a detection signal; image generation unit to generate image data of the sample according to the modulation control signal and the detection signal; modulation control signal generation unit to generate the modulation control signal such that Nyquist frequency of the image data will be larger than cut-off frequency in the spatial intensity distribution of the excitation light on the sample; and image processing unit to emphasize high-frequency component that exceeds the cut-off frequency included in the image data.