Fluorescence Microscopy Aberration Correction for Deep 3D Imaging
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Solution Overview
Problem
Existing methods for correcting aberrations in three-dimensional microscopy, such as confocal laser fluorescence and STED-microscopy, are inadequate in effectively addressing aberrations that occur in samples extending in three dimensions, particularly those caused by refractive index mismatches, leading to reduced image quality and resolution.
Innovation Solution
A method and apparatus that involves recording sectional images parallel to the optical axis, evaluating these images to define new aberration correction parameters, and iteratively refining these parameters to enhance aberration correction, using an adjustable correction device to focus excitation light distribution and detect fluorescence light, with a scanning fluorescence microscope equipped with a correction device and evaluation unit to optimize image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional aberration correction methods are used in three-dimensional microscopy, then image quality can be maintained at shallow depths, but image quality and resolution deteriorate significantly at greater depths due to refractive index mismatches
Solution Approach 1:
The patent applies preliminary action by measuring aberrations at multiple predetermined axial positions before actual imaging, and storing correction parameters for each position. This allows the system to pre-compensate for depth-dependent aberrations by selecting appropriate correction parameters based on the imaging depth, thereby maintaining image quality throughout the three-dimensional sample volume.
Solution Approach 2:
The patent implements parameter changes by adjusting correction device parameters (such as deformable mirror surface shape or adaptive lens focal length) according to the axial position in the sample. The system measures aberrations at different depths and modifies correction parameters accordingly, enabling dynamic compensation for refractive index mismatches that vary with depth in the sample.
2Manufacturing precision
If manual aberration correction adjustment is used, then correction can be optimized for specific conditions, but the process is time-consuming and requires user expertise
Solution Approach 1:
The patent applies self-service by implementing automated aberration measurement and correction parameter determination. The system automatically measures aberrations at multiple axial positions using test objects or reference samples, calculates optimal correction parameters, and stores them for subsequent imaging. This eliminates the need for manual adjustment by operators while maintaining high correction accuracy.
Solution Approach 2:
The patent implements feedback by measuring actual aberrations in the optical path and using this information to determine appropriate correction parameters. The system continuously monitors wavefront distortions and adjusts correction device parameters accordingly, creating a closed-loop control system that automatically optimizes image quality without user intervention.
3Adaptability or versatility
If correction parameters are optimized for each axial position, then image quality throughout the sample volume is improved, but the complexity of the correction system increases
Solution Approach 1:
The patent applies segmentation by dividing the three-dimensional sample space into multiple axial positions or depth ranges, each with its own optimized correction parameters. The system measures and corrects aberrations at discrete axial positions independently, then interpolates or selects appropriate parameters for intermediate depths. This segmented approach simplifies the overall correction strategy compared to attempting continuous correction throughout the entire volume.
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 significantly improves image quality and resolution in three-dimensional samples by effectively correcting aberrations, allowing for clearer and more detailed imaging of samples with refractive index mismatches.
Implementation Method 1
a excitation light distribution, which is focused by means of a microscope objective lens
Implementation Method 2
the excitation light distribution is corrected by means of an adjustable correction device
Implementation Method 3
fluorescence light emitted out of the first sample is detected for each scanning position
Data Source
AI summary
Scanning fluorescence microscopes and related methods are described for microscopically recording images of samples extending in three dimensions. In particular embodiments, the microscopes are configured for recording a first sectional image that is parallel to an optical axis of a microscope objective lens by scanning a sample with a focused excitation light distribution in a sectional area parallel to the optical axis of the microscope objective. The excitation light distribution may be corrected by a correction device according to initial adjustment values for adjustment parameters of an aberration correction function. The first sectional image is then evaluated and new adjustment values for the adjustment parameters are defined. Further image data are then recorded by scanning the sample with the focused excitation light distributions, with the excitation light distribution corrected by the correction device according to the new adjustment values for the adjustment parameters of the aberration correction function.