Adaptive Mirror for 3D Fluorescence Microscopy Depth Resolution
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Solution Overview
Problem
Current high-resolution 3D microscopy methods face limitations in achieving accurate depth resolution and are prone to false depth position assignments due to image distortions from molecular dipoles and astigmatism, particularly in PALM and STORM techniques, which require complex calculations and numerous images.
Innovation Solution
The implementation of an adaptive mirror in the microscope's imaging beam path that introduces astigmatism to capture rotationally asymmetric images, allowing for depth position information derivation from rotational asymmetry, and switches to non-astigmatic mode for correction and suppression of false depth assignments, using the non-astigmatic images as a reference for accurate depth analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If astigmatism is introduced in the imaging beam path to enable depth position derivation, then depth resolution is improved, but image distortion increases causing false depth position assignments
Solution Approach 1:
The adaptive mirror is switched between astigmatic and non-astigmatic modes in a periodic sequence. Astigmatic images are captured for depth position derivation, then non-astigmatic images are captured for correction. This periodic alternation allows the system to benefit from both depth resolution enhancement and distortion correction without permanent compromise to either function.
Solution Approach 2:
Non-astigmatic images serve as reference data that provides feedback for correcting false depth position assignments derived from astigmatic images. The control device uses the non-astigmatic reference images to identify and correct erroneous depth positions, creating a feedback loop that improves overall measurement reliability.
2Measurement precision
If numerous images are captured to achieve high-resolution 3D localization, then measurement precision is improved, but acquisition time increases
Solution Approach 1:
Instead of continuously capturing images, the system uses periodic switching between astigmatic and non-astigmatic modes. This allows the same set of images to serve dual purposes: depth information extraction from astigmatic images and correction reference from non-astigmatic images, reducing the total number of images needed while maintaining localization accuracy.
3Measurement precision
If complex calculations are performed to correct image distortions, then measurement precision is improved, but processing time increases
Solution Approach 1:
Non-astigmatic images are captured in advance as reference data before depth position derivation is performed. This preliminary capture of correction references allows the control device to perform corrections more efficiently during the actual depth measurement process, reducing real-time processing requirements.
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 enhances depth resolution and accuracy beyond optical limits, corrects false depth positions, and allows for flexible adjustment of depth range and resolution, while avoiding chromatic aberrations and mechanical disturbances, enabling reliable tracking of dynamic processes.
Implementation Method 1
An adaptive mirror which produces an astigmatism when still images are produced by the microscope
Implementation Method 2
fluorescence emitters in a sample are repeatedly excited to emit fluorescence
Data Source
AI summary
In a sample, fluorescence emitters are repeatedly excited to emit fluorescence, and still images are produced of the sample by means of a microscope. At least a subset of the fluorescence emitters is isolated in each still image. The positions of the fluorescence emitters are localized in the still images with a location accuracy exceeding the optical resolution. A high-resolution composite image is generated therefrom. An adaptive mirror is arranged in the imaging beam path, and is adjusted in such a manner that it produces an astigmatism when at least one of the still images is produced. As a result, still images with astigmatism are captured. Depth position information for the fluorescence emitters is derived from the rotational asymmetry. The adaptive mirror is additionally adjusted in such a manner that it does not produce any astigmatism when some of the still images are produced.