Microscopy System Segmentation for FLIM Tissue Detection
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Solution Overview
Problem
Current methods for integrating fluorescence lifetime imaging (FLIM) in surgical microscopes for brain tumor resection face challenges such as low PpIX accumulation detection due to autofluorescence, high laser power requirements, and limitations in field of view, resolution, and laser safety, particularly in neurosurgery, where low-grade gliomas and weak tissue infiltration are common, and there is a need for precise tissue differentiation to avoid neurological deficits.
Innovation Solution
A method for operating a microscopy system that divides the field of view into region segments for targeted irradiation with specific wavelengths to enhance detection of PpIX fluorescence, reduces photobleaching, and selectively treats malignant tissue using photosensitizers, while minimizing exposure to nonpathological tissue, employing adjustable light doses and machine learning for image processing to optimize FLIM imaging and photodynamic therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high laser power is used to improve signal-to-noise ratio and penetration depth, then detection sensitivity is improved, but laser safety risks and tissue damage increase
Solution Approach 1:
The patent divides the field of view into multiple region segments that can be irradiated sequentially. This allows the use of high laser power for improved detection sensitivity in each segment while limiting the total exposure time and reducing cumulative tissue damage risk. The segmentation approach enables high power irradiation without proportionally increasing safety hazards.
Solution Approach 2:
The patent applies different irradiation parameters to different region segments based on their specific characteristics and PpIX accumulation levels. This localized approach allows optimization of laser power for each region, using higher power where needed for detection sensitivity and lower power where tissue damage risk outweighs detection benefit.
2Area of stationary object
If the field of view is increased to examine larger regions, then coverage area is improved, but resolution and detection precision deteriorate
Solution Approach 1:
The patent segments the large field of view into multiple smaller region segments, each of which can be processed at high resolution. This allows the system to maintain excellent resolution and detection precision in each segment while collectively covering a large area. The sequential processing of segments enables both wide coverage and high precision.
3Productivity
If scanning rate is increased to reduce examination time, then productivity is improved, but measurement precision and signal accumulation deteriorate
Solution Approach 1:
The patent divides the examination into sequential region segments, allowing the system to scan through multiple segments at high speed while dedicating sufficient time to each segment for optimal signal accumulation. This segmentation enables high overall productivity while maintaining measurement precision in each segment through adequate irradiation and detection time.
Solution Approach 2:
The patent uses periodic irradiation and detection cycles for each region segment, optimizing the timing to accumulate sufficient signal while maintaining high scanning rates. The periodic action allows efficient time management between scanning different regions and acquiring high-quality signals in each region.
4Length of stationary object
If laser power is increased to penetrate deeper tissue, then detection depth is improved, but photobleaching and tissue damage increase
Solution Approach 1:
The patent segments the tissue examination into separate region segments, allowing high laser power to be applied to each segment for deep tissue penetration without causing excessive photobleaching. By limiting the total irradiation time through sequential segment processing, the system achieves deep penetration while minimizing cumulative energy loss and tissue damage.
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 and efficient detection of PpIX accumulations, reduces treatment duration, minimizes exposure to nonpathological tissue, and improves surgical precision by selectively targeting malignant tissue, thereby reducing neurological risks and costs.
Implementation Method 1
PpIX accumulates selectively in the tumor and emits red fluorescence under blue light illumination
Implementation Method 2
determining a substance-specific parameter within the region segment as a response to being irradiated by the light source
Data Source
AI summary
A method for operating a microscopy system includes irradiating a region segment of a first region by a light source with light at a first wavelength λ1 and a first luminous intensity L1, determining a substance-specific parameter within the region segment as a response to being irradiated by the light source, and repeating the steps for all region segments within the first region. In addition, the disclosure relates to a microscopy system, and a calibration method for a microscopy system.