MRI Coil Facility Actuator System for Dual-Frequency Switching
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Solution Overview
Problem
Current magnetic resonance imaging (MRI) systems face challenges in efficiently switching between different excitation frequencies due to interference issues and the need for resource-intensive coil changes, which affect clinical workflow and image quality.
Innovation Solution
A portable coil facility with a double-resonant transmit resonator and actuator system allows for the simultaneous operation of two receivers at different frequencies, enabling efficient switching between 1H and X-nucleus imaging without moving the coil or examination object, using a transmit/receive resonator and actuator system for precise positioning of receivers within the examination space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two high-channel receive arrangements are positioned simultaneously in a hybrid antenna for different frequencies, then both 1H and X-nucleus imaging can be performed, but unacceptable interference effects occur between the receive channels
Solution Approach 1:
The coil facility is divided into separate receive channels for different frequencies (1H and X-nucleus), with each channel having its own receive coil and signal processing path. This segmentation allows independent optimization and isolation of each frequency channel to prevent interference while maintaining multi-frequency capability
Solution Approach 2:
Frequency-selective elements such as bandpass filters and resonant circuits are introduced as intermediary components between the receive channels and the signal processing system. These intermediaries selectively pass only the intended frequency range to each receiver while blocking other frequencies, thereby eliminating cross-channel interference
2Reliability
If coil facilities are exchanged between different imaging types (1H to X-nucleus), then appropriate excitation can be achieved, but resource-intensive workflow disruption occurs and examination objects may move
Solution Approach 1:
The coil facility is designed as a universal system that can perform both 1H and X-nucleus imaging using a single multi-frequency transmit resonator combined with frequency-selective receive channels. This eliminates the need to exchange coils between different imaging types while maintaining optimized performance for each nuclear species
Solution Approach 2:
The system dynamically switches between different imaging modes (1H or X-nucleus) by activating the appropriate receive channel and adjusting frequency-selective components, rather than requiring physical reconfiguration. This dynamic switching maintains workflow efficiency while ensuring optimal imaging conditions for each type
3Object-affected harmful factors
If additional isolation and screening measures are implemented to reduce interference, then imaging quality improves, but device complexity increases
Solution Approach 1:
The system uses frequency-selective parameters (resonant frequencies, bandpass filter characteristics) to differentiate between channels. By designing receive channels with distinct frequency responses and using frequency as the primary separation parameter, effective isolation is achieved without requiring extensive physical screening or complex isolation structures
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 solution enhances imaging efficiency, reduces interference, and improves image quality by allowing concurrent operation of high-channel receivers for different frequencies within a single compact coil facility, eliminating the need for resource-intensive coil changes and minimizing patient exposure.
Implementation Method 1
a double-resonant transmit resonator for transmitting electromagnetic signals or fields of at least a first frequency and a second frequency differing therefrom into an examination space
Implementation Method 2
The first frequency and the second frequency may be resonance frequencies of the transmit resonator
Data Source
AI summary
A coil facility for a magnetic resonance installation and a magnetic resonance installation having such a coil facility are provided. The coil facility in this case includes a double-resonant transmit resonator for two frequencies and a first receiver and a second receiver, each for one of the two frequencies. The coil facility has an actuator system for effecting a relative spatial transposition of the transmit resonator, the first receiver, and the second receiver into various settings. In a first setting, only the first receiver, and in a second setting, only the second receiver, for receiving corresponding MR signals is arranged in an examination space that is at least sectionally surrounded by the transmit resonator.