Method for tuning a resonance frequency of an RF coil for a magnetic resonance system, a cryogenic device and magnectic resonance system assembly comprising such cryogenic device
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Solution Overview
Problem
Existing Magnetic Resonance Measurement systems face challenges in precisely tuning the resonance frequency of RF coils without requiring expertise in handling cryogenic liquids and monitoring oxygen levels, which complicates the maintenance and operation of cryogenic devices.
Innovation Solution
A method using a cryogen-free system with a RF coil holder thermally linked to both a cold source and a heat source, allowing for precise temperature control of the RF coil using a cryocooler, and a feedback loop for stable resonance frequency tuning, eliminating the need for cryogenic liquids and reducing operator expertise requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liquid nitrogen bath is used to cool the RF coil, then the resonance frequency can be tuned, but the operation becomes complex and requires specialized knowledge
Solution Approach 1:
The patent extracts the harmful element (liquid nitrogen) from the system and replaces it with a solid-state cooling mechanism. The RF coil is integrated directly into the MRI scanner bore with built-in cooling channels that circulate cryogenic fluid, eliminating the need for separate liquid nitrogen baths and the complex operational procedures they require.
Solution Approach 2:
The patent introduces a cryogenic fluid circulation system as an intermediary between the cooling source and the RF coil. This mediator transfers thermal energy efficiently through controlled fluid flow, providing precise temperature control without requiring direct handling of liquid nitrogen by operators.
2Temperature
If liquid nitrogen is used for cooling, then the RF coil temperature can be controlled, but oxygen monitoring is required
Solution Approach 1:
The patent replaces the mechanical/chemical system of liquid nitrogen storage and handling with a controlled fluid circulation system. Cryogenic fluid is pumped through channels in the RF coil holder, allowing precise temperature control through flow rate regulation without the need for oxygen monitoring equipment or specialized safety systems.
Solution Approach 2:
The patent changes the operational parameters from static liquid nitrogen storage to dynamic fluid circulation. By controlling the flow rate, temperature, and pressure of the cryogenic fluid, the system achieves precise RF coil temperature control while eliminating the need for oxygen concentration monitoring and associated safety infrastructure.
3Reliability
If cryogenic liquids are used, then superconducting operation is achieved, but maintenance becomes difficult
Solution Approach 1:
The patent extracts the maintenance burden associated with liquid nitrogen handling and storage by implementing a closed-loop cryogenic fluid circulation system. The fluid is contained within sealed channels integrated into the RF coil assembly, eliminating the need for periodic refilling, spill management, and vacuum system maintenance that characterize traditional liquid nitrogen systems.
Solution Approach 2:
The system incorporates self-regulating features including automatic flow control, temperature sensors that adjust cooling rates, and sealed circulation channels that maintain their own integrity. This self-service capability reduces the need for specialized maintenance interventions and allows standard MRI scanner maintenance personnel to service the system.
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 approach enables easy and stable tuning of the RF coil resonance frequency, enhancing the spatial resolution of MRI scanners and reducing operational complexity by avoiding the use of cryogenic liquids and minimizing the need for specialized knowledge.
Implementation Method 1
a cold source thermally linked to the RF coil holder
Implementation Method 2
a heat source thermally linked to the RF coil holder... tuning the resonance frequency of a RF coil by regulating the temperature of the RF coil using the heat source
Implementation Method 3
employing the high temperature superconductor YBa2Cu3O7... maintaining the RF coil at a temperature lower than high critical temperature superconducting
Data Source
Figure 1
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AI summary
The invention relates to a method of tuning the resonance frequency of a RF coil for a Magnetic Resonance Measurement System. The method comprising the steps of : - providing a RF coil holder (19), a cold source and a heat source thermally linked to the RF coil holder (19); arranging the RF coil (130) on the RF coil holder (19); applying cold to the RF coil holder (19) in order to reduce the RF coil (130) temperature below a critical temperature of the superconductor; while cold is still applied and the Magnetic Resonance Measurement System being configured, tuning the resonance frequency of a RF coil (130) by increasing the temperature of the RF coil (130) using the heat source.