RF Coil Array Decoupling via Adjustable Transformers
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Solution Overview
Problem
Existing RF coil arrays for magnetic resonance imaging systems face challenges in effectively decoupling RF coils, leading to suboptimal performance due to mutual inductance and coupling issues, which affect the accuracy and sensitivity of magnetic resonance signal detection.
Innovation Solution
The RF coil array employs sets of transformers with adjustable coupling strengths and geometrical overlap between coils, allowing for precise decoupling of RF coil elements in a two-dimensional pattern, providing additional degrees of freedom to fully decouple the coils without adding complex components, and allowing for optimization of coil sensitivity and adjustment for individual patients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional RF coil arrays are used without additional decoupling mechanisms, then the device complexity is low, but the decoupling performance and signal detection accuracy deteriorate due to mutual inductance between adjacent coils
Solution Approach 1:
Transformers are introduced as intermediary components between adjacent RF coil elements to mediate the electromagnetic coupling. The transformers provide controlled mutual inductance that enables active decoupling of the coils, improving signal detection accuracy while managing the complexity through a systematic intermediate structure.
Solution Approach 2:
The coupling strength between transformers is made adjustable, allowing dynamic modification of the decoupling parameters. This enables optimization of the decoupling effect for different imaging scenarios and patient anatomies, improving measurement precision without being constrained by fixed structural complexity.
2Adaptability or versatility
If fixed decoupling structures are used in RF coil arrays, then the device complexity is reduced, but the adaptability to different patients and examination scenarios deteriorates
Solution Approach 1:
The decoupling structure transitions from a fixed configuration to a dynamic, adjustable system. The coupling strength between transformers can be modified to adapt to different patient anatomies, coil array deformations during examination, and various imaging protocols, thereby enhancing versatility despite increased structural complexity.
3Reliability
If transformers with adjustable coupling are added to decouple RF coils, then the decoupling performance improves, but the device complexity and component count increase
Solution Approach 1:
The decoupling function is segmented and distributed across multiple transformer pairs, each responsible for decoupling specific adjacent coil elements. This modular approach improves decoupling effectiveness locally while organizing the overall complexity into manageable, repetitive units that can be systematically implemented across the coil array.
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 the decoupling of RF coils, improving the sensitivity and accuracy of magnetic resonance signal detection, enabling better image resolution and compensation for coil array deformation during examinations.
Implementation Method 1
The RF coil array employs sets of transformers with adjustable coupling strengths... configured for electromagnetically decoupling coils offset along the first diagonal axis
Data Source
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AI summary
A radio frequency (RF) coil array with multiple RF coil elements for a magnetic resonance examination system is disclosed. The decoupling of RF coil elements involves sets (pairs) of transformers and may also include geometrical overlap of adjacent coils. The mutual coupling between the transformers is adjustable. This provides additional degrees of freedom to fully decouple the RF coil elements from each other.