RF Receiver Active Decoupling for Flexible Coil Arrays
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Solution Overview
Problem
Modern magnetic resonance imaging (MRI) systems with high channel count coils face significant residual coupling issues that traditional decoupling methods cannot address, especially in high-field applications and with flexible, thin arrays where coupling varies due to patient load and cannot be compensated by static means.
Innovation Solution
An RF receiver system with active decoupling using a transverse communication circuit and excitation paths to generate compensation signals that are coupled into each RF receive coil element, utilizing a fast bidirectional data bus and digital receive chains for efficient decoupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional decoupling methods like overlapping elements are used, then neighboring coil elements can be decoupled, but residual coupling from non-neighboring elements and patient load dependent coupling cannot be compensated
Solution Approach 1:
The patent implements dynamic decoupling by continuously adjusting the decoupling state of each coil element based on real-time detection of coupling conditions. The system determines when coupling occurs between coil elements and dynamically switches the decoupling state accordingly, rather than using fixed static decoupling structures. This allows the system to adapt to varying patient loads and coupling conditions that traditional static methods cannot address.
Solution Approach 2:
The system employs feedback mechanisms where the coupling state between coil elements is continuously monitored and detected. Based on this feedback information, the control unit adjusts the decoupling state of individual coil elements to maintain optimal performance. This closed-loop feedback approach enables compensation for residual coupling that traditional open-loop static decoupling methods cannot handle.
2Adaptability or versatility
If flexible and thin coil arrays are used to improve patient comfort and coverage, then coil coupling varies widely due to proximity to tissue and foldability, but classical static decoupling means like overlap and transformers cannot compensate
Solution Approach 1:
The patent makes the decoupling mechanism dynamic by enabling individual coil elements to switch between coupled and decoupled states based on real-time conditions. This dynamic control allows flexible coil arrays to maintain reliable performance despite varying coupling conditions caused by patient movement, breathing, or coil folding, which static decoupling structures cannot accommodate.
Solution Approach 2:
The system divides the coil array into individually controllable coil elements, each capable of independent decoupling control. This segmentation allows precise control over each element's coupling state, enabling the system to handle the varying coupling conditions inherent in flexible arrays without requiring a completely rigid static decoupling structure for the entire array.
3Productivity
If high channel count coils are used to improve image quality and speed, then residual coupling increases that cannot be compensated by traditional decoupling methods
Solution Approach 1:
The system uses feedback-based detection to monitor coupling between individual coil elements in high channel count arrays. Based on this feedback, the control unit dynamically adjusts decoupling states to minimize residual coupling effects, enabling the system to maintain high imaging performance with reduced interference between the numerous coil channels.
Solution Approach 2:
The dynamic decoupling capability allows each coil element in the high channel count array to be independently controlled, switching between coupled and decoupled states as needed. This dynamic control prevents residual coupling from accumulating across multiple channels, maintaining signal integrity and imaging quality that would otherwise deteriorate with increased channel count.
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
Effectively compensates for residual coupling in flexible and foldable RF coils, improving image quality by reducing interference and adapting to varying patient loads.
Implementation Method 1
an excitation path (4), wherein the excitation path (4) is configured to couple the compensation signal into the RF receive coil element (2)
Data Source
AI summary
For a radio frequency (RF) receiver system (1) for use in a magnetic resonance (MR) imaging system, a solution for compensating residual coupling of RF receive coil elements (2) in the radio frequency (RF) receiver (1) system shall be created. This is achieved by a radio frequency (RF) receiver system for use in a magnetic resonance (MR) imaging system, the RF receiver system (1) comprising at least two simultaneously used RF receive coil elements (2), wherein the RF receive coil element (2) comprises a signal generator (3) for providing a compensation signal and an excitation path (4), wherein the excitation path (4) is configured to couple the compensation signal into the RF receive coil element (2), for reducing residual coupling in the RF receiver system (1) by means of the compensation signal coupled into the RF receive coil element (2). The present invention also refers to a magnetic resonance (MR) imaging system, a method for active decoupling of a radio frequency (RF) receiver system (1) of a magnetic resonance (MR) imaging system, a software package for a magnetic resonance (MR) imaging system, a software package for upgrading a magnetic resonance (MR) imaging system and a computer program product comprising instructions which, when the program is executed by a computer, cause the computer to carry out the steps of the method as described in the claims.