Conductive Phantom for Brain Electromagnetic Simulation
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Solution Overview
Problem
Current methods for localizing brain electrical activity using functional brain imaging systems lack a solid ground truth for the exact location of brain electrical activity, which hinders the development and improvement of source localization techniques and biomarker detection algorithms.
Innovation Solution
A physical head model, or phantom, is developed to simulate the electromagnetic properties of a human head, comprising a base, a simulated brain with embedded dipoles, a simulated skull, and a scalp layer, made from conductive materials mimicking human tissue conductivities. This phantom generates electrophysiological signals similar to those from a human brain, allowing for the evaluation of brain activity source localization methods and biomarker detection algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If functional brain imaging systems are used to localize brain electrical activity, then source localization and biomarker detection can be performed, but there is no solid ground truth for the exact location of brain electrical activity
Solution Approach 1:
The patent creates a physical phantom that copies the essential electromagnetic properties of the human head (brain, skull, scalp layers with specific conductivities) to serve as a ground truth model. This allows evaluation of source localization accuracy without requiring invasive measurement in real human brains.
Solution Approach 2:
The phantom acts as an intermediary between the complex biological system (human brain) and the measurement systems (EEG/MEG). It provides a controlled environment with known electromagnetic properties that mediates the evaluation of localization algorithms and biomarker detection methods.
2Reliability
If a physical phantom is created to simulate human head electromagnetic properties, then ground truth for source localization is provided, but the device complexity increases
Solution Approach 1:
The phantom is segmented into distinct layers (brain, skull, scalp) with different conductive properties. Each layer is modeled separately using appropriate conductive materials, allowing the complex electromagnetic simulation to be broken down into manageable components that can be fabricated and assembled systematically.
Solution Approach 2:
The patent uses composite conductive materials with specific resistivity values for different tissue types. By combining multiple materials with different electrical properties in a layered structure, the phantom accurately reproduces the electromagnetic characteristics of the human head while maintaining a manageable physical structure.
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
The phantom provides a reliable ground truth for evaluating the accuracy of brain activity source localization and biomarker detection, facilitating the development and assessment of functional brain imaging modalities like EEG and MEG, and enhancing the quality of recordings from deep to superficial brain sources.
Implementation Method 1
A physical head model, or phantom, is developed to simulate the electromagnetic properties of a human head... This phantom generates electrophysiological signals similar to those from a human brain
Implementation Method 2
comprising a base, a simulated brain with embedded dipoles, a simulated skull, and a scalp layer, made from conductive materials mimicking human tissue conductivities
Data Source
AI summary
Systems and methods according to which a plurality of dipoles embedded within a simulated human brain of a simulated human head are stimulated with electricity. In one or more embodiments, the electricity with which the plurality of dipoles are stimulated is based on a recording of an animate human head. In one or more embodiments, stimulating the plurality of dipoles with the electricity causes the simulated human head to generate one or more electromagnetic properties that simulate same of the animate human head. In one or more embodiments, the one or more electromagnetic properties are detected from the simulated human head via: a first non-invasive technique; a second non-invasive technique that is different from the first non-invasive technique; or both the first non-invasive technique and the second non-invasive technique. For example, the one or more electromagnetic properties may be detected via both the first and second non-invasive techniques simultaneously.