Flexible MRI Coil Parallel Conductors Reduce Cross-Coupling Artifacts
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Solution Overview
Problem
Flexible MRI coils face challenges in maintaining consistent antenna positioning, leading to unwanted artifacts due to overlapping antennas, which restricts their ability to conform to complex patient geometries and requires multiple coil configurations for varying anatomical regions.
Innovation Solution
A flexible local coil with multiple conductors extending in parallel, connected at both ends and arranged to bend in multiple non-parallel axes, forming parallel conduction paths to reduce resistance and improve the quality factor, thereby increasing the signal-to-noise ratio and reducing artifact susceptibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If antennas are overlapped to detect NMR signals from the entire region, then the coverage area is improved, but cross-coupling artifacts occur between overlapping antennas
Solution Approach 1:
Each antenna is divided into multiple parallel conductors that are electrically connected at both ends, creating multiple parallel conduction paths. This segmentation reduces the resistance of each antenna while maintaining the overlapping configuration for full coverage, thereby improving signal detection across the entire region without compromising coverage area.
Solution Approach 2:
The electrical parameters of the antennas are modified by introducing multiple parallel conductors with reduced resistance. This parameter change allows the antennas to maintain consistent electrical characteristics even when overlapped, reducing cross-coupling artifacts while preserving the ability to detect NMR signals from the entire region of interest.
2Stability of the object's composition
If a rigid housing is used to maintain consistent antenna positioning, then the spatial relationship between antennas is preserved, but the coil cannot conform to complex anatomical shapes
Solution Approach 1:
The rigid housing is replaced with a flexible substrate that allows the coil to conform to complex anatomical shapes while maintaining antenna positioning. The flexible substrate enables the coil to adapt to various body contours without compromising the consistent spatial relationship between overlapping antennas, thereby resolving the contradiction between stability and adaptability.
Solution Approach 2:
The housing transitions from a static rigid structure to a dynamic flexible substrate that can adapt its shape to match different anatomical regions. This dynamic flexibility allows the coil to maintain consistent antenna positioning while conforming to various body shapes, improving both patient comfort and imaging quality across different applications.
3Measurement precision
If antennas are positioned closer to the anatomical region, then the signal-to-noise ratio is improved, but the coil design becomes more complex to accommodate various sizes
Solution Approach 1:
The flexible substrate with multiple parallel conductor antennas creates a universal coil design that can be adapted to various anatomical sizes and shapes. This single flexible configuration can conform to different body regions and patient sizes while maintaining optimal antenna positioning close to the anatomical region, thereby improving signal-to-noise ratio without requiring multiple specialized coil designs.
Solution Approach 2:
The flexible substrate allows for parameter changes in the coil's physical dimensions and shape to accommodate different anatomical regions. By maintaining the same fundamental design with multiple parallel conductors that can be flexed and positioned, the system achieves high signal-to-noise ratio across various applications without increasing device complexity through multiple configurations.
4Reliability
If multiple parallel conductors are used to reduce resistance, then the quality factor is improved, but the manufacturing complexity increases
Solution Approach 1:
Multiple parallel conductors are merged into a single integrated antenna structure on the flexible substrate. This merging approach reduces resistance and improves quality factor while simplifying manufacturing, as the parallel conductors are formed as part of the same fabrication process rather than being separate components that require assembly.
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
The solution enhances the signal-to-noise ratio and reduces the susceptibility to artifacts from overlapping antennas, allowing the coil to conform better to complex anatomical shapes with fewer coil configurations, improving imaging quality and reducing the need for multiple coil sizes.
Implementation Method 1
Each of the electrical conductors for one of the antennas are mounted together on the flexible substrate such that they bend along each of the non-parallel axes in tandem. Each of the electrical conductors for one of the antennas is electrically connected at both the first end and the second end... The parallel conduction paths reduce the resistance of the antenna which, in turn, improves the quality factor, Q, of the antenna.
Implementation Method 2
an MRI scanner generates a strong magnetic field which aligns nuclei in the presence of the magnetic field and then detects the faint nuclear magnetic resonance (NMR) signals given off as radio frequency signals by nuclei returning to a normal state in the absence of the magnetic field.
Data Source
AI summary
A flexible coil with improved tolerance for overlapping antennas and with reduced susceptibility to the introduction of image artifacts as a result of overlapping antennas utilizes antennas with multiple conductors extending in parallel for the length of the antenna. Each conductor is connected to the other conductor at each end creating parallel conduction paths for the length of the antenna. The parallel conduction paths reduce the resistance of the antenna which, in turn, improves the quality factor of the antenna. The improved quality factor results in antennas that are less susceptible to image artifacts being induced in the antenna due to coupling from an overlapping antenna.