Brain Measurement System Using Multi-Coil Resonance Tuning
Solution Overview
Problem
Brain measurement systems face challenges in achieving both high detection sensitivity and a sufficient field of view (FOV), as improving sensitivity typically narrows the detectable frequency band.
Innovation Solution
The system incorporates a static magnetic field coil, gradient magnetic field coil, transmission coil, receiving coils, resonance adjustment circuits, and detection units, where the resonance frequency of each receiving coil is set based on its position and the magnetic field gradient, allowing for improved sensitivity and a broader FOV by arranging multiple coils with different resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection sensitivity is improved by using a resonance adjustment circuit, then signal detection capability is enhanced, but the frequency band becomes limited to about several kHz
Solution Approach 1:
The system divides the frequency detection task into multiple segments by using multiple receiving coils, each tuned to a different resonance frequency. Each coil handles a specific frequency range, and the results are combined to achieve both high sensitivity in each band and broad overall coverage.
Solution Approach 2:
The patent transitions from a single-frequency detection approach to a multi-frequency parallel detection system. By arranging receiving coils with different resonance frequencies along the Z-axis and utilizing the magnetic field gradient, the system expands the detection capability from one frequency dimension to multiple frequency dimensions simultaneously.
2Device complexity
If a single receiving coil is used, then the system configuration is simple, but both detection sensitivity and field of view cannot be achieved simultaneously
Solution Approach 1:
Each receiving coil is positioned at a specific location along the Z-axis and tuned to a specific resonance frequency, creating local optimization. The magnetic field gradient ensures that each coil's resonant frequency corresponds to its position, allowing each component to operate at peak sensitivity while collectively covering a broad field of view.
3Measurement precision
If multiple receiving coils with different resonance frequencies are arranged according to the magnetic field gradient, then both detection sensitivity and field of view are ensured, but the device complexity increases
Solution Approach 1:
Multiple receiving coils serve dual purposes: each coil is optimized for high sensitivity at its specific resonance frequency while collectively providing broad frequency band coverage. This multi-functional arrangement allows the system to achieve both narrowband sensitivity and broadband capability simultaneously.
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 configuration enhances detection sensitivity while maintaining a sufficient FOV, allowing for more comprehensive brain measurements with improved signal detection and reduced electrical interference.
Implementation Method 1
a static magnetic field coil for applying a static magnetic field
Implementation Method 2
a gradient magnetic field coil for applying a gradient magnetic field
Implementation Method 3
a transmission coil for transmitting a transmission pulse having a predetermined frequency
Implementation Method 4
a plurality of receiving coils for detecting a nuclear magnetic resonance signal generated by transmission of the transmission pulse and converting the nuclear magnetic resonance signal into a current
Implementation Method 5
a plurality of resonance adjustment circuits provided corresponding to each of the plurality of receiving coils for outputting a signal having a predetermined resonance frequency of a current output from the receiving coil
Data Source
AI summary
Provided is a brain measurement system including: a geomagnetic correction coil; a geomagnetic gradient correction coil; a transmission coil; a receiving coil; a plurality of resonance adjustment circuits; a plurality of OPM modules provided corresponding to each of the plurality of resonance adjustment circuits for detecting a signal having a resonance frequency output from the resonance adjustment circuit; and a control device for generating an MR image based on the signal detected by the OPM module, wherein, when a direction parallel to a central axis of a head portion of a subject is defined as a Z-axis direction, the resonance frequency related to each of the plurality of resonance adjustment circuits is set according to a magnetic field gradient in the Z-axis direction generated by control of a position of the corresponding receiving coil in the Z-axis direction and a tilted magnetic field.