Dome Illumination Mitigates Specular Highlights in Tissue Imaging
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Solution Overview
Problem
Existing multi-spectral autofluorescence imaging systems face issues with specular highlights, which saturate pixels and inhibit accurate reflection measurements in tissue samples, due to specular reflections that dominate images and interfere with the detection of autofluorescence signatures.
Innovation Solution
A system utilizing a dome with highly reflective and photometrically non-reactive interior surfaces to surround the tissue sample, ensuring uniform illumination and reducing specular highlights by reflecting light at predetermined wavelengths, allowing for effective detection of autofluorescence and reflectance without fluorescence interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a point source illumination is used to illuminate the tissue sample, then the autofluorescence detection is enabled, but specular highlights occur that saturate pixels and inhibit accurate reflection measurements
Solution Approach 1:
The illumination is divided into multiple discrete sources arranged in a circular pattern around the tissue sample, rather than using a single point source. This segmentation of the illumination into multiple spatially distributed sources eliminates the concentrated specular reflection that occurs with point source illumination, while maintaining sufficient total illumination intensity for autofluorescence detection.
Solution Approach 2:
The illumination sources are arranged asymmetrically in a circular pattern at different positions around the tissue sample, rather than using symmetric point source illumination. This asymmetric arrangement ensures that no single location on the tissue surface receives direct specular reflection from a single source, distributing the reflected light across multiple directions and preventing pixel saturation.
2Device complexity
If a point source illumination is used, then the system structure is simple, but specular highlights dominate portions of the image and saturate pixels
Solution Approach 1:
The illumination system is segmented into multiple discrete light sources arranged in a circular pattern, which distributes the illumination across different angles. This segmentation prevents any single location from receiving concentrated specular reflection, thereby preventing information loss due to pixel saturation while maintaining reasonable system complexity.
Solution Approach 2:
A circular diffuser or reflective surface is introduced as an intermediary element between the light sources and the tissue sample. This intermediary distributes the light from multiple sources uniformly across the tissue surface, eliminating specular highlights and preventing information loss without significantly increasing the overall system complexity.
3Measurement precision
If conventional microscopy is used for tissue analysis, then detailed imaging is achieved, but the system is expensive and requires complex transmission optics
Solution Approach 1:
The tissue sample itself serves as the light source through its inherent autofluorescence properties. By illuminating the tissue with multiple light sources and detecting the emitted fluorescent light, the system eliminates the need for complex transmission optics and expensive microscopy equipment, while still achieving detailed tissue imaging through the tissue's own optical properties.
Solution Approach 2:
The system replaces complex mechanical transmission optics with a simpler arrangement of multiple light sources and detectors. Instead of using expensive microscope optics to transmit and focus light, the system uses direct illumination and detection of autofluorescence, substituting mechanical optical complexity with a simpler photometric measurement approach.
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 system significantly reduces or eliminates specular highlights, enabling more uniform and accurate imaging of tissue samples, similar to high-end microscopes, while avoiding the need for transmission optics and providing cost-effective, label-free diagnostics.
Implementation Method 1
The one or more interior surfaces are configured to reflect the light at one or more predetermined wavelengths
Implementation Method 2
The biomolecules present in different tissues provide discernible and repeatable autofluorescence spectral patterns
Data Source
AI summary
A system and method for imaging a tissue sample is provided. The system includes a dome, at least one excitation light source, and at least one light detector. The dome is configured to surround at least a portion of a tissue sample. The dome has interior surfaces that define a dome interior cavity. The excitation light source is configured to produce light at one or more wavelengths. The excitation light source is in photometric communication with the dome. The dome interior surfaces are configured to reflect the light at the one or more predetermined wavelengths. The dome is configured to cause the light at the one or more predetermined wavelengths to be incident to the exposed surface of the tissue sample in a substantially uniform manner. The light detector is in photometric communication with the dome and configured to detect light emitted or reflected from the tissue sample.