Barcode-Based Geometrical Correction for Lateral Flow Assay Readers
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Solution Overview
Problem
Current lateral flow assays lack a general reader capable of processing cassettes of different shapes and colors, leading to inaccuracies due to geometrical distortion in scanned images, and require specific instruments for each type of cassette, limiting the use of low-cost measurement solutions.
Innovation Solution
Incorporating a proprietary barcode system on the test strips that allows for geometrical distortion correction and identification, enabling a scanner or camera-based system to accurately read test results by using database-stored information about the barcode and cassette geometry, and allowing for decentralized or centralized network architectures for image analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a scanner or camera-based system is used to read lateral flow cassettes, then the system can process cassettes of different shapes and colors, but geometrical distortion in the scanned images introduces measurement inaccuracies
Solution Approach 1:
A barcode is introduced as an intermediary element on the cassette that encodes geometrical reference information. This barcode serves as a mediator between the imaging system and the measurement process, providing distortion correction data that enables accurate measurements despite variations in cassette geometry and imaging conditions
Solution Approach 2:
The barcode with embedded geometrical information is placed on the cassette before imaging. This preliminary encoding of reference data allows the system to pre-calculate distortion correction parameters, enabling accurate measurements to be performed even when the cassette has non-standard shapes or colors
2Measurement precision
If multiple specific instruments are used for different cassette types, then measurement accuracy is maintained, but device complexity and the need for multiple instruments increases
Solution Approach 1:
The imaging system is designed with universal capability to read barcodes and perform measurements on any cassette type. The barcode provides cassette-specific geometrical information, allowing a single multi-functional instrument to replace multiple specialized instruments while maintaining measurement accuracy across different cassette formats
3Ease of manufacture
If low-cost measurement cassettes are used, then cost is reduced, but the lack of a general reader capability limits their usability
Solution Approach 1:
The barcode serves as a universal intermediary that enables compatibility between low-cost cassettes and the imaging system. By encoding geometrical reference information in the barcode, the system can accommodate diverse, low-cost cassette designs without requiring expensive specialized readers for each cassette type
Data Source
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AI summary
A method and system for analysis of immunoassays, and more specifically to an improved analysis of chromatographic assays, often referred to as a lateral flow assay is disclosed. These assays commonly employ a test strip utilizing visible particles as the labels for the analytes to be detected, where, as an additional feature, the analytical strip is removable for reading the quantity of analytes captured therein and for archival purposes. An image of the test strip is analysed automatically.