EEG Electrode Array Positioning With Optical-Electrical 3D Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing EEG systems face challenges in accurately positioning electrodes on a subject's head, particularly outside clinical settings, due to the complexity and cost of current methods, which are cumbersome and require qualified personnel, making home use difficult.
Innovation Solution
A system utilizing a stereo camera pair and electrical components to construct 3D models of the EEG electrode array and couplant distribution, enabling accurate electrode positioning by capturing images and measuring voltage responses, suitable for non-qualified users in non-clinical environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a 3D scanning system with multiple synchronized cameras is used to determine electrode positions, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent divides the electrode positioning task into two independent phases: a calibration phase where a 3D model of the head is created using multiple cameras, and an operation phase where a single camera captures images for electrode position determination. This segmentation allows the system to achieve high measurement precision during calibration while using a simple single-camera system during actual use, thereby reducing overall device complexity.
Solution Approach 2:
The patent performs preliminary 3D modeling of the subject's head using multiple cameras during a first session. This pre-computed 3D model serves as a reference framework that enables accurate electrode position determination in subsequent sessions using a single camera. The preliminary action of creating the 3D model eliminates the need for complex multi-camera systems during actual electrode positioning.
2Measurement precision
If multiple pictures are taken from different angles for 3D model reconstruction, then measurement precision is improved, but loss of time increases due to repeated scanning when subject moves
Solution Approach 1:
The patent creates a 3D model of the subject's head during an initial calibration session using multiple cameras. This pre-computed 3D model serves as a reference framework that enables accurate electrode position determination in subsequent sessions using a single camera. The preliminary action of creating the 3D model eliminates the need for time-consuming multi-angle scanning during actual electrode positioning.
Solution Approach 2:
The patent uses a 2D image captured by a single camera and relates it to the pre-computed 3D model through coordinate transformation. Instead of capturing multiple 2D images from different angles and performing complex 3D reconstruction in real-time, the system uses the pre-existing 3D model as a template and transforms the single 2D image coordinates into the 3D space, significantly reducing time loss.
3Reliability
If a technician performs electrode positioning in a clinical environment, then reliability is improved, but ease of operation deteriorates for home use by non-qualified persons
Solution Approach 1:
The patent enables the system to automatically determine electrode positions using a single camera and pre-computed 3D model without requiring technician intervention. The system captures images of the electrode array, transforms the coordinates using the stored 3D model, and automatically identifies electrode positions, allowing non-qualified users to perform EEG testing at home with reliable positioning accuracy.
Solution Approach 2:
The patent replaces the manual mechanical process of technician-based electrode positioning with an automated optical-electrical system. Instead of relying on human skill and physical placement, the system uses a single camera to capture images and computational algorithms to automatically determine electrode positions, making the process accessible to non-qualified users while maintaining reliability.
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 cost-effective, simple, and accurate electrode positioning for EEG systems, allowing home use and reducing user discomfort by simplifying the process of electrode placement.
Implementation Method 1
a stereo camera pair which captures at least one image of the head of the subject wearing the EEG electrode array carrier
Implementation Method 2
an electrical system which constructs a 3D electrical model of the EEG electrode array and an electrical model of a couplant spreading of the couplant which couples the electrodes to the head of the subject
Data Source
AI summary
Disclosed herein are methods and systems for identifying a position of a plurality of electrodes in an EEG electrode array embedded to an EEG electrode array carrier when the EEG electrode array carrier is worn on a head of a subject. A first system is an optical system containing a stereo camera pair which captures at least one image of the head of the subject wearing the EEG electrode array carrier. A second system is an electrical system which constructs a 3D electrical model of the EEG electrode array and an electrical model of a couplant spreading of the couplant which couples the electrodes to the head of the subject. The two systems may be integrated to one electro-optical system for identifying a position of electrodes in an EEG electrode array on a head of a subject.