MR Coil Assembly With Frequency-Selective Antenna Blocking
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Solution Overview
Problem
Existing coil arrangements for MRI systems, particularly those used in ultra-high-field MRI, face challenges in efficiently tuning and operating to detect both 1H and X nuclei due to the need for complex control equipment and difficulty in achieving suitable capacitance and inductance values, leading to reduced signal-to-noise ratio and increased operational effort.
Innovation Solution
A coil arrangement with connecting elements featuring frequency-selective blocking circuits that automatically block at specific frequencies, allowing dipole antennas to be electrically isolated or connected, enabling independent operation for 1H and X nucleus detection with ease, using larger capacitance and inductance values, and avoiding the need for complex control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If connecting elements are used to switch between electrically connecting and disconnecting states to enable multi-frequency operation, then adaptability for detecting different nuclei (1H and X nuclei) is improved, but device complexity increases due to the need for control equipment
Solution Approach 1:
The connecting elements are designed to automatically switch between electrically connecting and disconnecting states based on the input signal frequency, eliminating the need for external control equipment. The system serves itself by using the signal characteristics to trigger the appropriate state changes in the connecting elements.
Solution Approach 2:
The connecting elements utilize frequency-selective blocking circuits that change their electrical state based on the frequency parameter of the input signal. By detecting the frequency and automatically adjusting their connection state, the system achieves multi-frequency operation without complex control mechanisms.
2Adaptability or versatility
If complex control equipment is used to manage connecting elements for multi-frequency operation, then adaptability is improved, but ease of operation deteriorates
Solution Approach 1:
The connecting elements automatically adjust their connection state based on the signal frequency without requiring user intervention or complex control interfaces. This self-regulating mechanism maintains ease of operation while enabling multi-frequency functionality.
3Reliability
If conventional coil arrangements are used for ultra-high-field MRI, then detection capability for 1H and X nuclei is attempted, but signal-to-noise ratio deteriorates due to operational difficulties
Solution Approach 1:
The frequency-selective blocking circuits automatically identify and respond to the signal frequency, ensuring optimal connection states are achieved without manual tuning. This automated optimization maintains high signal-to-noise ratio by eliminating operational errors and suboptimal configurations.
4Reliability
If conventional coil arrangements are used for ultra-high-field MRI, then detection capability is attempted, but ease of manufacture deteriorates due to difficulty in achieving suitable capacitance and inductance values
Solution Approach 1:
The frequency-selective blocking circuits automatically adjust the electrical parameters of the connecting elements based on the signal frequency, simplifying the manufacturing process. This automated parameter adjustment eliminates the need for manual tuning of capacitance and inductance values during 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 provides a high signal-to-noise ratio and efficient operation for both 1H and X nucleus detection, reducing operational effort and maintaining sensitivity comparable to monofrequency arrangements without significant losses or the use of lossy components.
Implementation Method 1
The connecting elements comprise connecting element blocking circuits which automatically block when a high-frequency alternating voltage with a frequency corresponding to the blocking frequency of the connecting element blocking circuits is applied to the coil arrangement
Implementation Method 2
The high-frequency alternating electromagnetic field has a frequency that resonates with the Lamor frequency fL of the atomic nuclei to be excited
Implementation Method 3
This precessing transverse magnetization ultimately induces a high-frequency alternating voltage in a combined high-frequency transmitting and receiving coil arrangement
Data Source
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AI summary
The invention relates to a coil assembly (1) for use as a transmission and/or receiving coil in an MR system which comprises a dipole antenna assembly (2) with multiple dipole antennas 2a-d which are connected together via connection elements 3a-h. The connection elements 3a-h are designed to be converted from an electrically conductive state to an electrically non-conductive state and vice versa, and the assembly is designed such that in the electrically conductive state of the connection elements 3a-h, the dipole antennas 2a-d form at least one part of a preferably cylindrical volume coil and/or a conductor loop assembly of the coil assembly (1), in particular a flat conductor loop assembly, with at least one conductor loop 20a-c, wherein the connection elements 3a-h comprise connection element blocking circuits 4a-h which automatically block when a high-frequency alternating voltage with a frequency corresponding to the blocking frequency of the connection element blocking circuits 4a-h is applied to the coil assembly (1). The invention additionally relates to an MR system comprising such a coil assembly (1) and to the use of such a coil assembly (1).