pH-Step Electroscopic Imaging on ChemFET Arrays for Cell Localization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for analyzing cells on sensor arrays lack efficient techniques for visualizing and segmenting cell regions from background regions based on electrochemical signals, limiting the ability to accurately monitor cellular responses and metabolic activities.
Innovation Solution
A method involving a ChemFET sensor array that generates electroscopic image data through a pH step change in solution flow, followed by image segmentation to distinguish cell and background regions, allowing for precise localization and analysis of cellular activities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to analyze cells on sensor arrays, then the analysis can be performed, but the ability to accurately monitor cellular responses and metabolic activities is limited due to lack of efficient visualization and segmentation techniques
Solution Approach 1:
The patent applies electroscopic imaging that converts electrochemical signals into visual image data, where different regions (cell vs. background) are differentiated by signal intensity characteristics. This enables accurate visualization and segmentation of cell regions without requiring complex mechanical or optical systems, thereby improving measurement precision while avoiding excessive device complexity
Solution Approach 2:
The patent replaces traditional mechanical or optical microscopy systems with an electrochemical sensing approach. By using ChemFET sensors to generate electroscopic images based on pH step changes, the system achieves accurate cell region segmentation through electrical signal processing rather than complex mechanical imaging systems
2Loss of information
If electroscopic imaging is implemented to visualize cell regions, then the ability to differentiate cell and background regions is improved, but the device complexity increases due to additional sensing and processing requirements
Solution Approach 1:
The ChemFET sensor array serves multiple functions: it acts as both the pH sensing element and the imaging device. The same sensors that measure pH changes also generate the electroscopic image data, eliminating the need for separate imaging systems and reducing overall device complexity while preventing information loss about cell locations
Solution Approach 2:
The patent uses pH step changes in the solution as an intermediary to reveal cell locations. The pH change acts as a probe that interacts with cells, and the resulting electrochemical signals serve as a mediator to generate visual image data, enabling information acquisition without direct optical or mechanical imaging
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
Enables high-resolution, subcellular monitoring of cellular responses and metabolic activities by providing clear differentiation between cell and background regions, enhancing the accuracy and efficiency of cell analysis.
Implementation Method 1
a plurality of ChemFET sensors of the ChemFET sensor array generate a plurality of signals in response to the step change in pH of the flowed solution
Data Source
AI summary
Analyzing cells disposed on a sensor array surface of a ChemFET sensor array, may include flowing a solution having a step change in pH across the sensor array surface, wherein ChemFET sensors of the sensor array generate signals in response to the step change in pH to produce electroscopic image data. Multiple frames of the electroscopic image data are acquired during an acquisition time interval. Each frame corresponds to signal samples generated by the sensor array measured at a sampling time during the acquisition time interval. Each frame comprises pixels, wherein a given pixel in the frame corresponds to a signal sample from a given sensor in the sensor array. The electroscopic image data is segmented, based on characteristics of the signal samples, into cell regions corresponding to locations of the cells on the sensor array surface and background regions corresponding to areas on the sensor array having no cells.