Layered Index-Matching Structure for Paraffin-Embedded Tissue Imaging
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Solution Overview
Problem
Conventional methods for imaging paraffin-embedded histopathology slides face challenges due to optical rough surfaces and low-contrast features, leading to suboptimal imaging quality and the introduction of background noise from surface reflections, which complicates the diagnosis process.
Innovation Solution
A method involving a tissue section embedded in a solid material, such as paraffin, is positioned on a layered structure with an anti-reflective coating and index matching medium to reduce optical back reflections, allowing incident light to pass through with minimal reflection, enabling clear visualization of tissue features and artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional microscopy methods are used to image paraffin-embedded tissue sections, then the imaging process is simple and quick, but the imaging quality is poor due to optical rough surfaces and background light from surface reflections
Solution Approach 1:
A layered structure comprising a bottom layer and a top layer is introduced as an intermediary between the paraffin-embedded tissue section and the microscope. The bottom layer has a refractive index matched to paraffin, and the top layer has a refractive index matched to the immersion medium, creating gradient index matching that eliminates optical interfaces and reduces surface reflections, thereby improving imaging quality without requiring deparaffinization
Solution Approach 2:
The refractive indices of the layered structure materials are specifically selected and optimized to match the refractive indices of paraffin and immersion medium at the imaging wavelength. This parameter change in refractive index eliminates optical impedance mismatches at interfaces, reducing reflections and scattering while maintaining structural support for the tissue section
2Measurement precision
If deparaffinization and staining processes are performed to improve imaging quality, then imaging quality improves, but the process becomes laborious and complex, adding cost and time
Solution Approach 1:
The layered structure with optimized refractive indices is applied to the paraffin-embedded tissue section before imaging, performing the optical optimization step in advance. This preliminary action eliminates the need for subsequent deparaffinization and staining steps, as the layered structure enables direct high-quality imaging of the embedded section, thereby reducing process complexity while maintaining imaging quality
3Productivity
If light is applied to paraffin-embedded tissue sections for imaging, then imaging can be performed, but optical back reflection at interfaces creates artifacts that reduce imaging quality
Solution Approach 1:
The layered structure acts as an optical intermediary that eliminates sharp refractive index discontinuities at interfaces. By providing gradient index matching between paraffin and immersion medium, it prevents total internal reflection and reduces optical back reflection, thereby eliminating imaging artifacts while maintaining fast imaging speed
Solution Approach 2:
The layered structure comprises multiple materials with different refractive indices arranged in specific layers. This composite structure creates a gradual transition in refractive index from paraffin to immersion medium, reducing optical impedance mismatch and minimizing reflection artifacts at each interface while allowing rapid light transmission for high-speed imaging
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 imaging quality by reducing artifacts and background noise, allowing for accurate visualization and identification of tissue features, even without deparaffinization, and facilitates multi-color and multi-modal imaging for improved diagnostic capabilities.
Implementation Method 1
a layered structure configured to reduce optical back reflection at an interface between the tissue section embedded in the solid material and the layered structure
Implementation Method 2
The incident light passes the tissue section embedded in the solid material and the layered structure with reduced reflection at each of the interfaces
Data Source
AI summary
A method and device for visualizing a sample having a tissue section embedded in a solid material are provided. The method and device include applying an incident light to the tissue section embedded in the solid material. The tissue section embedded in the solid material is disposed on a layered structure configured to reduce optical back reflection at an interface between the tissue section embedded in the solid material and the layered structure. The incident light passes through the tissue section embedded in the solid material and the layered structure with reduced reflection at each of the interfaces such that visualizing one or more artifacts from reflecting the incident light from surfaces of the tissue section embedded in the solid material is reduced.