MRI RF Antenna Detuning via Electroluminescent Feedback
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Solution Overview
Problem
Current RF antenna elements for MRI lack precise control over detuning, which affects the accuracy of magnetic resonance imaging processes.
Innovation Solution
An RF antenna element with a detuning system that incorporates an electroluminescent switching element coupled to a resonant electrically conductive loop, utilizing a photo-electric conversion element to detect an electroluminescent signal and provide electronic feedback for precise control of the detuning state, enhancing the accuracy of the detuning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an RF antenna element uses a conventional detuning system, then the structure is simpler, but the control precision of detuning is insufficient
Solution Approach 1:
The patent implements a feedback control mechanism where a photodetector monitors the detuning state of the RF antenna element and provides real-time feedback signals to a control unit. The control unit adjusts the detuning by controlling the conductivity of a switching element based on this feedback, thereby achieving precise detuning control. This closed-loop feedback system directly addresses the precision issue while managing complexity through automated control.
Solution Approach 2:
The patent replaces conventional mechanical or electrical detuning mechanisms with an optically controlled detuning system. An optical source modulates the conductivity of a switching element (such as a PIN diode) through optical signals, which in turn controls the detuning of the RF antenna element. This optical control mechanism provides more precise and rapid detuning adjustment compared to traditional methods.
2Reliability
If an RF antenna element implements precise detuning control, then the MRI imaging accuracy improves, but the device complexity increases
Solution Approach 1:
The patent integrates multiple functions into a single compact detuning system. The switching element serves both as a conductivity control component and as part of the RF antenna circuitry. The photodetector simultaneously monitors the detuning state and provides feedback for control. This multi-functional integration achieves reliable MRI imaging accuracy while minimizing the increase in overall device complexity.
Solution Approach 2:
The patent introduces an optical field as an intermediary between the control signal and the RF antenna element. An optical source converts electrical control signals into optical signals that modulate the switching element's conductivity, which then affects the RF antenna's detuning. This optical intermediary provides precise control while isolating the RF and control circuits, improving reliability without proportionally increasing 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
The solution allows for more accurate control of the RF antenna element's detuning state, improving the precision of MRI imaging by providing a significant difference in signal levels between open and closed circuit conditions, and enabling effective monitoring of the load on the electrically conductive loop.
Implementation Method 1
An RF antenna element with a detuning system incorporates an electroluminescent switching element coupled to a resonant electrically conductive loop, utilizing a photo-electric conversion element to detect an electroluminescent signal
Implementation Method 2
a photo-electric conversion element to detect an electroluminescent signal from the electroluminescent switching element
Data Source
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AI summary
An RF antenna element with a detuning system in which the RF antenna element comprises a resonant electrically conductive loop. The (de)tuning system comprising a switching element to (de)tune the resonant electrically conductive loop. The (de)tuning system element includes an electroluminescent element coupled to the resonant electrically conductive loop. The (de)tuning system includes a photo-electrical conversion element to detect an electro-luminescent signal from the electroluminescent element.