Optical Polarization Imaging for In Vivo Collagen Structure Assessment
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Solution Overview
Problem
Current imaging techniques for skin and skin tumors, such as reflectance confocal microscopy and optical coherence tomography, face limitations in depth penetration, accuracy, and field of view, making it challenging to accurately determine surgical margins preoperatively in Mohs surgery, leading to inefficient and prolonged procedures.
Innovation Solution
The use of optical polarization imaging (OPI) with visible light at 440 nm for cross-polarization, providing a non-invasive, rapid, and quantitative assessment of dermal collagen structure, allowing for accurate visualization and delineation of tumor boundaries in vivo, using a polarization-sensitive, wide-field reflectance imaging instrument with an imaging detector and light source to capture cross-polarized images at different depths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If confocal microscopy is used for imaging skin structure, then cellular resolution is achieved, but imaging depth is insufficient and collagen structure cannot be visualized in vivo
Solution Approach 1:
The patent changes the imaging parameters by using non-linear optical microscopy techniques (two-photon microscopy and second harmonic generation) that operate at different optical parameters compared to confocal microscopy. These techniques use longer wavelengths and non-linear optical processes to achieve both deep tissue penetration and high resolution imaging of collagen structure in vivo.
2Measurement precision
If non-linear microscopy techniques (two photon microscopy, second harmonic generation) are used, then high-resolution morphological detail and deeper light penetration depth are achieved, but high power densities are required and field of view is very small
Solution Approach 1:
The patent utilizes the non-linear optical effects of two-photon absorption and second harmonic generation, which occur at the focus of a high numerical aperture objective lens. By carefully controlling the laser parameters and using the inherent optical sectioning capability of these non-linear techniques, the patent achieves high resolution imaging with reduced overall power requirements compared to linear microscopy techniques.
3Length of stationary object
If non-linear microscopy techniques are used, then deeper light penetration depth is achieved, but field of view is very small making in vivo visualization impractical
Solution Approach 1:
The patent employs optical sectioning capability inherent in non-linear microscopy to capture images at different depths, which can then be reconstructed into three-dimensional representations of the tissue. This segmentation of the imaging volume into optical sections allows comprehensive visualization of deep tissue structures while maintaining a manageable field of view at each section.
4Measurement precision
If histopathological and immunohistochemical studies are used for diagnosing diseases, then accurate diagnosis is achieved, but biopsy is required causing discomfort, scarring and infection
Solution Approach 1:
The patent replaces the mechanical biopsy procedure with non-linear optical microscopy techniques that use light to image tissue structures in vivo. This substitution eliminates the need for physical tissue removal, thereby avoiding discomfort, scarring, and infection risks while maintaining diagnostic capability through visualization of collagen structure and tissue morphology.
5Ease of operation
If simple visual inspection is used to identify tumor boundaries, then the procedure is simple, but accuracy is insufficient leading to multiple surgical stages
Solution Approach 1:
The patent utilizes the differential optical properties and light scattering characteristics of normal versus tumor tissue to create contrast in the images. Tumor tissue exhibits altered collagen structure and cellular organization that affect light propagation, allowing visual differentiation from healthy tissue through image analysis without requiring complex staining or contrast agents.
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 enables more accurate preoperative determination of surgical margins, reducing the number of surgical stages, streamlining the procedure, and minimizing tissue removal, thereby improving surgical efficiency and patient outcomes.
Implementation Method 1
optical polarization imaging (OPI) with visible light at 440 nm for cross-polarization
Implementation Method 2
polarization-sensitive, wide-field reflectance imaging instrument
Data Source
AI summary
Instruments and methods for wide-field polarized imaging of the skin to determine an outer lesion margin objectively in vivo to provide guidance to a surgeon. Quantitative characterization of collagen structures in the skin can be used to determine the outer lesion margin or monitor skin treatment.