Adjustable Wearable Optical Measurement System for Neural Signal Detection
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Solution Overview
Problem
Current methods for detecting neural activity in the brain, such as time-correlated single-photon counting (TCSPC), face challenges in consistently and accurately measuring neural signals due to variability in positioning and scattering of light pulses within turbid media like the brain, leading to inconsistent data acquisition.
Innovation Solution
The development of an optical measurement system with a wearable device that includes adjustable support assemblies and a position alignment system, allowing for precise and consistent positioning of light sources and detectors on the user's head, enabling reliable and repeatable acquisition of neural signals by using time domain-based optical measurement techniques like TCSPC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed positioning methods are used for light sources and detectors, then device simplicity is maintained, but measurement precision deteriorates due to positioning variability
Solution Approach 1:
The support assembly incorporates adjustable positioning mechanisms that allow the light sources and detectors to be dynamically repositioned along the support structure. This enables the system to adapt to different head sizes and shapes while maintaining precise optical coupling, resolving the contradiction between measurement precision and device complexity by making the positioning system adjustable rather than fixed
Solution Approach 2:
The wearable device is divided into modular components including multiple light sources, detectors, and support assemblies that can be independently adjusted. This segmentation allows each component to be optimized for its specific function while maintaining overall system precision without requiring the entire device to be complex
2Reliability
If adjustable positioning mechanisms are added to improve positioning consistency, then reliability improves, but device complexity increases
Solution Approach 1:
The support assembly includes adjustable mechanisms that allow positioning to be optimized for each user's anatomy. The adjustability is built into the support structure itself, using mechanical elements like sliding joints or adjustable straps that provide reliability through consistent reproducible positioning without requiring complex electronic control systems
Solution Approach 2:
The adjustable positioning system is designed to be easily configured by the user or operator without requiring complex calibration procedures. The mechanical adjustment mechanisms allow direct manual positioning, making the system self-configuring and reducing the need for complex control systems while maintaining reliability
3Measurement precision
If precise positioning is implemented, then data acquisition quality improves, but ease of operation deteriorates
Solution Approach 1:
The support assembly provides adjustable positioning that can be quickly configured for different users. The mechanical adjustment mechanisms are designed for easy manual operation, allowing precise positioning to be achieved without complex procedures, thus maintaining ease of operation while improving data acquisition quality
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 solution ensures consistent and reliable detection of neural activity by maintaining precise positioning of light sources and detectors, improving the accuracy and repeatability of data acquisition across multiple use sessions, facilitating better imaging and analysis of brain activity.
Implementation Method 1
One technique to measure such responses is time-correlated single-photon counting (TCSPC). Time-correlated single-photon counting detects single photons and measures a time of arrival of the photons with respect to a reference signal
Implementation Method 2
Detecting neural activity in the brain (or any other turbid medium) is useful for medical diagnostics... by measuring responses of tissue within the brain to light pulses
Data Source
AI summary
An optical measurement system includes a wearable device configured to be worn on a body of a user and a position alignment system. The wearable device includes a support assembly and a wearable assembly supported by the support assembly. The wearable assembly includes a plurality of light sources configured to emit a plurality of light pulses toward a target within the body of the user and a plurality of detectors each configured to receive a set of photons included in a light pulse included in the plurality of light pulses after the set of photons is scattered by the target. The position alignment system is configured to facilitate positioning of the wearable assembly at a same position on the body of the user during different use sessions of the wearable device.