Lateral Flow Assay Strip Reading With Human-Machine Verification
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Solution Overview
Problem
Existing diagnostic testing systems for COVID-19 lack efficient, accurate, and rapid results, often requiring human interpretation and lacking standardized data collection and display, which can lead to errors and delays in identifying infected individuals.
Innovation Solution
A machine-based system for analyzing lateral flow assay strips using a processor to compare intensity values with threshold settings, integrating human input for verification, and storing results in a central database for standardized reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If machine-based automated reading is used, then reading speed and consistency are improved, but measurement precision and reliability may deteriorate due to lack of human expert judgment
Solution Approach 1:
The patent combines machine-based automated reading with human operator verification in a hybrid system. The machine performs initial automated analysis of lateral flow assay strips, while human operators review and verify results, particularly for borderline or ambiguous cases. This merging approach leverages the speed advantage of automation while maintaining the precision and judgment capabilities of human experts.
Solution Approach 2:
The system incorporates feedback mechanisms where operator-provided results are recorded and compared with machine readings. This feedback loop allows continuous improvement of the automated reading algorithm by learning from operator corrections and expert judgments, thereby enhancing measurement precision over time while maintaining high productivity.
2Measurement precision
If human visual reading is used, then measurement precision and reliability are improved, but productivity and reading speed deteriorate
Solution Approach 1:
The patent segments the reading process into two stages: initial automated machine reading that handles the bulk of analysis, and selective human review for verification. This segmentation allows the system to maintain high productivity through automation while preserving human expertise for critical verification tasks, achieving both speed and precision.
3Reliability
If standardized data collection and display are implemented, then reliability and consistency are improved, but device complexity increases
Solution Approach 1:
The patent implements a universal data collection and display framework that handles multiple test types, operators, and reading methods through a single standardized system. The database and display interfaces are designed to accommodate various data formats and sources, providing standardized output without requiring separate complex systems for each function, thus managing complexity while improving reliability.
4Productivity
If automated machine reading is used, then productivity is improved, but loss of information may occur due to lack of contextual analysis
Solution Approach 1:
The patent introduces an intermediary database layer that captures and stores contextual information about tests, operators, patients, and reading conditions. This intermediary structure preserves valuable contextual data that would otherwise be lost in automated processing, while the standardized display interface presents this information in a consistent manner, preventing information loss without significantly increasing system complexity.
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
Provides rapid, accurate, and standardized test results, enabling efficient data collection and comparison of machine and human readings, supporting widespread implementation and data analysis for public health measures.
Implementation Method 1
comparing a measured intensity value of a portion of the test line in the LFA strip image to the intensity threshold value
Data Source
AI summary
A system including a processor and memory coupled to the processor. The memory stores a local testing database having a test configuration profile for a cassette having a lateral flow assay (“LFA”) strip having a test line and intensity threshold value. An operator input device is coupled to the processor for receiving operator provided results from an operator that is provided to the processor. An LFA test result display for displaying an LFA test result, and an LFA strip reader coupled to the processor for reading the LFA strip is in the system. The processor determines the LFA test result based on comparing a measured intensity value of a portion of the test line in the LFA strip image to the intensity threshold value for the test line, receives the operator provided result from the operator input device, and provides to the LFA test result display the LFA test result.