Gapped Multi-Birdcage MRI RF Coil Design
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Solution Overview
Problem
The complexity and cost associated with achieving simultaneous use of two birdcage coils in MRI systems due to the need for decoupling, which increases complexity and expense.
Innovation Solution
A gapped multi-birdcage MRI RF coil design featuring short-length birdcage coils separated by large gaps, allowing for good signal-to-noise ratio (SNR) and transmit efficiency, with the option to use multiple birdcage coils in both transmit and receive modes, and the use of phase shifters for coupling when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two birdcage coils are used simultaneously in MRI systems, then the functionality and versatility are improved, but the device complexity and cost increase due to the need for decoupling mechanisms
Solution Approach 1:
The patent divides the MRI coil system into multiple independent birdcage coil units that can operate simultaneously without requiring complex decoupling mechanisms. Each birdcage coil is designed as a separate, self-contained unit with short length and specific geometric parameters, allowing them to function independently while maintaining system versatility.
Solution Approach 2:
The patent changes the geometric parameters of the birdcage coils, specifically using short-length designs with optimized dimensions and spacing. By adjusting the length, diameter, and separation distance between coils, the system achieves simultaneous operation without needing additional decoupling components, thereby reducing complexity while maintaining functionality.
2Reliability
If two birdcage coils are used simultaneously with decoupling mechanisms, then the independence of coil operation is improved, but the device complexity and cost increase
Solution Approach 1:
The patent segments the MRI coil system into multiple independent birdcage units that naturally operate independently through their physical separation and optimized geometric parameters. This segmentation eliminates the need for additional decoupling mechanisms while maintaining operational independence and reliability of each coil unit.
Solution Approach 2:
The patent extracts and removes the decoupling mechanisms from the system by designing birdcage coils with specific geometric parameters and spacing that inherently provide sufficient isolation. This extraction simplifies the overall system while preserving the independence of each coil's operation.
3Measurement precision
If birdcage coils are separated by large gaps, then the signal-to-noise ratio and transmit efficiency are improved, but the coil length increases
Solution Approach 1:
The patent optimizes the geometric parameters of the birdcage coils, specifically the ratio of diameter to length and the spacing between coils. By using short-length designs with larger diameters and appropriate spacing, the system achieves high signal-to-noise ratio and transmit efficiency without requiring excessive coil length, as the efficiency gains come from the geometric configuration rather than increased size.
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 design achieves high SNR and transmit efficiency while reducing complexity and cost by allowing independent operation of birdcage coils and enabling efficient use in various anatomical applications, including whole-body coils.
Implementation Method 1
the birdcage coil has become one of, if not, the most popular magnetic resonance imaging (MRI) transmit (Tx) coil
Implementation Method 2
it often includes a radio frequency (RF) shield separating it from gradient coils
Data Source
AI summary
Various embodiments of the present disclosure are directed towards a magnetic resonance imaging (MRI) radio frequency (RF) coil configured to operate in at least one of a transmit mode or a receive mode. A first birdcage coil includes a pair of first-birdcage end rings and at least four first-birdcage rungs circumferentially arranged along the first-birdcage end rings. A second birdcage coil including a pair of second-birdcage end rings and at least four second-birdcage rungs circumferentially arranged along the second-birdcage end rings. The first and second birdcage coils neighbor and are spaced by a first non-zero distance along an axis. The axis is surrounded by the first-birdcage end rings and the second-birdcage end rings, and the first non-zero distance is greater than individual lengths of the first and second birdcage coils along the axis.