Brain Electrical Property Mapping for Targeted Transcranial Stimulation
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Solution Overview
Problem
Current transcranial electrical stimulation techniques for monitoring and therapeutic applications face challenges due to high voltages causing diffuse current spread, leading to unwanted side effects and limited precision in targeting specific brain areas, which hinders their effectiveness and safety, especially in surgical procedures and treatment of conditions like Parkinson's disease and depression.
Innovation Solution
A method utilizing MRI or CAT scan data to generate an electrical property map of the brain, allowing for the segmentation of tissue compartments and assignment of electrical characteristics, enabling the calculation of optimal electrical inputs for targeted transcranial or intracranial applications, thereby reducing current densities and improving the precision of electrical stimulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage electrical pulses are applied for transcranial stimulation, then the stimulation effect is achieved, but the current spread becomes diffuse causing unwanted side effects
Solution Approach 1:
The head is divided into multiple tissue compartments (scalp, skull, brain, etc.) with distinct electrical conductivity properties. This segmentation allows the model to track and control current distribution through each compartment, enabling precise targeting while minimizing diffuse spread to unwanted areas.
Solution Approach 2:
Different tissue compartments are assigned different electrical conductivity values based on their specific properties. This local quality differentiation allows the system to predict and control where current will concentrate versus where it will disperse, enabling high power stimulation at the target while minimizing side effects in surrounding tissues.
2Ease of operation
If conventional electrode placement is used, then the procedure is simple, but the precision in targeting specific brain areas is limited
Solution Approach 1:
The electrical property map is generated in advance using MRI or CT scan data before the actual stimulation procedure. This preliminary modeling allows the system to predict current distribution patterns for different electrode placements, enabling selection of optimal positions that achieve both simplicity and high targeting precision.
Solution Approach 2:
The system uses the generated electrical property map to provide feedback on predicted current distribution. This allows operators to adjust electrode placement and stimulation parameters based on modeled predictions, achieving precise targeting while maintaining procedural simplicity through iterative optimization.
3Power
If high voltage pulses are applied to overcome tissue resistance, then current reaches the brain, but muscle activation and patient movement occur causing risk factors
Solution Approach 1:
The model segments the head into distinct compartments including muscle tissues, allowing separate analysis of current distribution. This enables identification of stimulation parameters that deliver sufficient power to the brain while keeping current density in muscle tissues below activation thresholds, thereby preventing unwanted movements and improving safety.
Solution Approach 2:
The system optimizes multiple electrical parameters (voltage, pulse duration, frequency, electrode configuration) based on the individual's electrical property map. By changing these parameters within a multi-dimensional space, the system finds combinations that achieve reliable brain stimulation while maintaining procedure safety by avoiding muscle activation.
Data Source
AI summary
A method performed at a computer system having one or more processors and memory storing one or more programs for execution by the one or more processors is disclosed. The method includes accessing multiple images of a biological structure, generating an electrical property map of at least a portion of the biological structure in accordance with two or more of the multiple images, and providing at least a subset of the electrical property map.