Optical Biometric System Probe Selection for Brain Activity Measurement
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Solution Overview
Problem
Existing optical brain function imaging apparatuses require multiple reference probes to calculate the amount of received light, making the process costly and inefficient.
Innovation Solution
The system acquires skin blood flow data in a pretest using multiple reference probes, then selects necessary probes for a main test to measure brain activity, reducing the number of reference probes needed and optimizing data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple reference probes are used to calculate the amount of received light, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies preliminary action by performing a pretest measurement before the actual brain activity measurement. During the pretest, skin blood flow data is acquired using multiple reference probes to identify and select only the necessary probes for the main measurement. This preliminary step allows the system to determine which reference probes are actually needed, reducing the number of probes required during the main measurement while maintaining measurement precision.
2Measurement precision
If multiple reference probes are used to acquire skin blood flow data, then measurement precision is improved, but loss of time increases due to data processing
Solution Approach 1:
The patent applies the extraction principle by separating the reference probe selection process into a distinct pretest phase. During this pretest, skin blood flow data is acquired using multiple reference probes, and necessary probes are identified and selected based on the quality and relevance of the data. This extraction of the selection process from the main measurement workflow allows for efficient data processing and reduces time loss during the actual brain activity measurement.
3Measurement precision
If a large number of reference probes are placed on the scalp, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent applies preliminary action by performing probe selection during a pretest phase before the actual measurement. Multiple reference probes are temporarily placed on the scalp during the pretest to acquire skin blood flow data, and the necessary probes are identified and selected based on the data quality. This preliminary selection process simplifies the operation during the main measurement, as only the selected necessary probes need to be used, reducing the complexity of probe placement and management.
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 method allows for accurate measurement of brain activity data with a reduced number of reference probes, lowering costs and improving efficiency in data acquisition.
Implementation Method 1
simultaneous equations are formed as shown in the relational expressions (1), (2) and (3) using a modified Beer Lambert law, for example, in order to find the product [oxyHb] of the change in the concentration of oxyhemoglobin in the brain blood flow and the optical path length
Data Source
AI summary
An optical biometric system (1) is characterized by being provided with: a first received light amount information acquisition unit (25) which acquires skin blood flow data relating to a skin blood flow in a wide range of the scalp of a subject by controlling the transmission/reception of light to/from a light transmission/reception unit (30) using a wide-range control table; and a selection control table creation unit (24) which causes a storage unit (23) to store a selection control table for acquiring X pieces of first received light amount information (ΔA1) selected from among N pieces of first received light amount information (ΔA1), and in that when acquiring multiple pieces of measurement data relating to the brain activity in a predetermined range of the brain of the subject by controlling the transmission/reception of light to/from the light transmission/reception unit (30) using a control table, a light transmission/reception control unit (21) acquires skin blood flow data relating to a skin blood flow in a predetermined position of the scalp of the subject by controlling the transmission/reception of light to/from the light transmission/reception unit (30) using the selection control table.