Multilayered Phantom Tissue Test Structure for OCT Calibration
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Solution Overview
Problem
Current methods lack a standardized and uniform approach for calibrating medical imaging devices, particularly for axial resolution, which is crucial for depth-resolving optical systems like OCT and confocal microscopy, and there is a need for a phantom test structure that achieves optical uniformity to enhance precision and accuracy in calibration.
Innovation Solution
A multilayer phantom test target structure is created using a process that forms monolayers of light-scattering microspheres with interspersed transparent polymer layers, achieved through polyelectrolyte multilayers and convective particle flux on a glass substrate, allowing for precise spatial calibration and independent validation of OCT devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional calibration methods are used, then calibration can be performed, but the precision and accuracy are insufficient due to lack of standardized phantom structures
Solution Approach 1:
The patent applies parameter changes by systematically varying the size, spacing, and material composition of microsphere inclusions within the phantom layers. This allows optimization of optical scattering properties to achieve precise axial resolution calibration while maintaining standardized structural parameters for reliable inter-laboratory comparison.
Solution Approach 2:
The patent employs composite materials by combining transparent polymer matrices with dispersed light-scattering microspheres of controlled sizes and compositions. This composite structure creates well-defined optical interfaces that enhance measurement precision while the standardized composition ratios ensure reliability across different phantom instances.
2Measurement precision
If complex phantom structures are created to achieve optical uniformity, then calibration accuracy improves, but the fabrication complexity and cost increase
Solution Approach 1:
The patent applies segmentation by dividing the phantom into multiple discrete layers, each containing microspheres of specific sizes and concentrations. This modular approach achieves optical uniformity through controlled layer stacking while simplifying fabrication by allowing independent preparation and quality control of each layer before assembly.
Solution Approach 2:
The patent uses parameter changes to optimize the balance between accuracy and complexity by systematically adjusting microsphere size distributions, layer thicknesses, and inter-layer spacing. These controlled parameter variations create the necessary optical contrast for accurate calibration without requiring overly complex fabrication procedures.
3Reliability
If standardized phantom structures are implemented, then inter-laboratory comparison becomes feasible, but the adaptability to different imaging modalities is reduced
Solution Approach 1:
The patent applies universality by designing a phantom structure with standardized geometric parameters and optical properties that can serve multiple imaging modalities including OCT, confocal microscopy, and other depth-resolving techniques. The modular layer design allows the same phantom to be used across different systems while maintaining reliable inter-laboratory comparison capabilities.
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 method produces a stable, portable phantom test target that replicates axial resolution and contrast, enabling precise spatial calibration and accurate quantitative measurements, addressing the lack of standards for axial resolution calibration and enhancing the precision of OCT imaging.
Implementation Method 1
heating a glass substrate to induce convective particle flux
Implementation Method 2
polyelectrolyte multilayers (PEMs) for particle-substrate binding
Data Source
AI summary
A multilayered optical tissue phantom fabrication approach and inherently produced test target structure which address the issues of of optical conformity known in the art by controlling the formation of micrometer scale monolayers embedded with light-scattering microspheres.