Atomic Magnetometer Brain Impedance Tomography
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Solution Overview
Problem
Non-invasive electrical impedance tomography techniques face challenges in measuring brain electrical properties due to the high impedance of the skull, which lowers signal-to-noise ratio and image resolution, making it difficult to effectively image brain function or detect pathologies like stroke or tumors.
Innovation Solution
The use of magnetic detection electrical impedance tomography (MD-EIT) with atomic magnetometers, such as optically pumped magnetometers, to measure magnetic fields arising from electrical currents applied through electrodes, allowing for non-invasive imaging of brain function and detection of fast neural activity, blood flow changes, and pathologies without the need for cryogenic cooling, and enabling portable devices for use in various environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrical impedance tomography is used to measure brain electrical properties, then non-invasive measurement is achieved, but the high impedance of the skull significantly lowers signal-to-noise ratio and image resolution
Solution Approach 1:
The patent introduces magnetic field detection as an intermediary measurement method. Instead of directly measuring electrical currents through the skull (which suffers from high impedance), the system applies electrical currents via electrodes and detects the resulting magnetic fields using magnetometers. This intermediary magnetic field measurement bypasses the skull's impedance barrier, significantly improving signal-to-noise ratio while maintaining non-invasive operation.
2Reliability
If conventional EIT electrodes are placed around the body part, then electrical signals can be applied, but the skull's high impedance prevents effective signal penetration and measurement
Solution Approach 1:
The patent replaces direct electrical measurement (mechanical/electrical system) with magnetic field detection. By using magnetometers to detect magnetic fields generated by applied currents rather than measuring currents directly through the skull, the system eliminates the harmful effect of skull impedance. This substitution of measurement methodology removes the primary barrier to reliable brain imaging.
3Ease of operation
If atomic magnetometers are used for magnetic field detection, then portable non-invasive imaging is enabled, but the requirement for cryogenic cooling in traditional magnetometers limits portability
Solution Approach 1:
The patent employs atomic magnetometers that operate at room temperature, fundamentally changing the temperature parameter from cryogenic requirements to ambient conditions. This parameter change enables portable, non-invasive brain imaging devices that can be deployed in clinical and field settings without complex cryogenic cooling infrastructure, while maintaining high sensitivity for detecting neural activity.
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
This approach provides high-resolution, non-invasive imaging of brain electrical properties, including fast neural changes and blood flow, with improved signal-to-noise ratio and the ability to detect pathologies like stroke, enabling imaging in non-specialist environments and remote locations, and can be used to inform medical practice.
Implementation Method 1
detecting magnetic fields arising from the imposed electrical currents using a plurality of magnetometers disposed about the subject
Implementation Method 2
atomic magnetometers may be used, for example optically pumped magnetometers, since these do not require any cryogenic cooling
Data Source
AI summary
A non-invasive method of determining electrical properties within the brain of a human or animal subject is disclosed. Electrodes are disposed across the scalp of the subject, and atomic magnetometer sensors are disposed around the scalp. Then, for each of a plurality of combinations of the electrodes, a probe electrical signal is applied to the electrodes of the combination and magnetic field signals arising from the probe electrical signals are measured at each of a plurality of the atomic magnetometer sensors. The measured magnetic field signals may then be used to determine electrical properties within the brain.