Resonant Circuit Cables for Multi-Nuclear MR Safety
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Solution Overview
Problem
Existing MR systems are not safe for multinuclear magnetic resonance applications due to the induction of RF currents in electrically conductive components and cables, which can impair image quality and pose safety risks.
Innovation Solution
Incorporation of resonant circuits with high impedance poles at specific magnetic resonance frequencies to block RF current induction in electrical cables and components, allowing safe operation in multi-nuclear MR systems by tuning inductance and capacitance values to match the frequencies of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electric cables and conductive components are used in MR systems, then electrical connectivity is provided, but RF currents are induced during multi-nuclear MR procedures which impairs image quality and poses safety risks
Solution Approach 1:
A resonant circuit is introduced as an intermediary component between the RF transmission system and the electric cable. This resonant circuit is tuned to the specific nuclear frequency (e.g., 31P frequency) and presents a high impedance at that frequency, thereby blocking RF currents from inducing in the cable while allowing safe operation in multi-nuclear MR systems
Solution Approach 2:
The impedance characteristics of the cable system are changed by introducing a resonant circuit with specific inductance and capacitance values. The resonant circuit is tuned to have a high impedance pole at the target nuclear frequency, transforming the cable from being RF-conductive at all frequencies to being RF-blocking at specific frequencies while maintaining electrical connectivity
2Reliability
If resonant circuits are added to block RF currents, then safety and image quality are improved, but device complexity increases
Solution Approach 1:
The resonant circuit serves multiple functions simultaneously: it blocks RF currents at the specific nuclear frequency, maintains electrical connectivity for signal transmission, and can be integrated into existing cable structures. This multi-functionality reduces the need for separate protective components, thereby limiting the increase in overall device complexity
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
Ensures the safety and reliability of components and cables during multi-nuclear MR procedures by preventing substantial electric current induction, thereby maintaining image quality and ensuring component safety.
Implementation Method 1
Existing MR systems are not safe for multinuclear magnetic resonance applications due to the induction of RF currents in electrically conductive components and cables
Implementation Method 2
Incorporation of resonant circuits with high impedance poles at specific magnetic resonance frequencies to block RF current induction
Data Source
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AI summary
An apparatus for use in a magnetic resonance system, the apparatus comprising: an operative component (22, 26) configured to perform a useful operation in a magnetic resonance system; an electrical cable (24, 28) connected with the operative component to provide electrical communication with the operative component; and a resonant circuit (30, 32) including at least a portion of the electrical cable, the resonant circuit having a first impedance pole at a first magnetic resonance frequency and a second impedance pole at a second magnetic resonance frequency different from the first magnetic resonance frequency.