Phase Contrast Microscopy Using Inclined Detection and Z-Stack Imaging
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Solution Overview
Problem
Existing phase contrast imaging methods require significant technical retrofitting and do not offer high specificity in imaging structures of light-transmissive samples.
Innovation Solution
The method involves capturing multiple image recordings of light-transmissive samples using the transport-of-intensity equation (TIE) and differential phase contrast (DPC) techniques while inclining the detection axis relative to the sample plane, followed by converting these recordings into a normalized z-stack for image combination, minimizing technical retrofitting and enhancing specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase contrast imaging methods are used to image light-transmissive samples, then structural visibility is improved, but technical complexity and retrofitting requirements increase
Solution Approach 1:
The detection optics unit is designed to perform both standard imaging and phase contrast imaging functions. By capturing multiple image recordings at different focal planes and processing them through the evaluation unit, the system achieves phase contrast capability without requiring separate dedicated hardware, thus reducing technical complexity while maintaining structural visibility improvement
Solution Approach 2:
Instead of modifying the optical path in complex ways, the invention captures images at multiple focal planes (z-dimension) and uses computational processing to extract phase contrast information. This dimensional approach transforms the problem from optical hardware modification to data processing, reducing device complexity while achieving the desired imaging enhancement
2Measurement precision
If multiple image recordings are captured and combined by calculation to obtain phase contrast images, then structural specificity is improved, but measurement time increases
Solution Approach 1:
The system captures multiple image recordings at different focal planes in advance, storing them for subsequent processing. This preliminary capture of data allows the evaluation unit to later combine these recordings through calculation to generate phase contrast images with high structural specificity, without requiring real-time processing that would extend measurement time
Solution Approach 2:
The invention creates multiple copies of the sample at different focal planes and combines them computationally to generate the phase contrast image. This copying approach allows parallel data collection that can be processed afterward, reducing the impact on measurement time while achieving improved structural specificity
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 allows for high-contrast imaging of light-transmissive samples with reduced technical modifications, improving structural specificity and usability with existing optical arrangements.
Implementation Method 1
the influence of the sample on the formation of the wavefronts of illumination radiation (change in the phase thereof) can be used for example to create and represent contrasts in an otherwise largely contrast-free sample
Implementation Method 2
It is also possible to cause a detection radiation, for example by virtue of molecules present in the sample being excited to emit specific wavelengths by means of an illumination radiation (fluorescence)
Data Source
AI summary
The difference between a well-focused image and a slightly defocused image contains information about the phase of the object. This paper describes how to retrieve this phase information from images, formed by a noncoherent imaging system. Experiments with white light from an extended source are shown. A theoretical explanation for partially coherent illumination is presented.