Magnetic Resonance Antenna Dynamic Frequency Tuning
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Solution Overview
Problem
Magnetic resonance antennas with a birdcage structure face challenges in efficiently and cost-effectively detuning their resonant frequency to accommodate patients of different weights and to excite various atomic nuclei, as existing methods are either inefficient or require complex adjustments.
Innovation Solution
Incorporating capacitive and inductive oscillating circuit antenna elements with radio-frequency switching elements that can switch between permeable and impermeable states to dynamically adjust the resonant frequency, allowing for efficient adaptation to changing loads and nuclear species.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional detuning methods are used for birdcage antennas, then the resonant frequency can be shifted, but the process is complex and inefficient
Solution Approach 1:
The patent changes the electrical parameters of the antenna by switching capacitive and inductive elements between permeable and impermeable states. This allows the resonant frequency to be adjusted by changing the effective capacitance and inductance values through the switching elements, providing a simple and efficient detuning mechanism without complex mechanical or structural modifications.
Solution Approach 2:
The patent introduces dynamically switchable elements that can change the antenna's electrical characteristics in real-time. The radio-frequency switching elements allow the antenna to transition between different operational states (permeable/impermeable), enabling dynamic adjustment of the resonant frequency to accommodate different patient weights and nuclear species without requiring physical reconfiguration.
2Adaptability or versatility
If the resonant frequency is fixed, then the antenna structure is simple, but it cannot adapt to patients of different weights or different atomic nuclei
Solution Approach 1:
The patent makes the birdcage antenna universal by enabling it to serve multiple functions: it can be tuned to different resonant frequencies to accommodate patients of various weights and to excite different atomic nuclei (such as hydrogen, phosphorus, or sodium). The switching elements allow a single antenna structure to replace multiple fixed-frequency antennas, achieving multi-functionality without proportionally increasing complexity.
3Adaptability or versatility
If switching elements are added to adjust resonant frequency, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent applies switching elements at specific strategic locations within the birdcage antenna structure - at the antenna ferrules connecting the longitudinal rods. By placing the switching elements locally at these key junction points rather than throughout the entire structure, the patent achieves effective frequency control with minimal added complexity. The local modification at critical points allows global tuning of the resonant frequency.
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 enables optimal adaptation of the resonator's function to varying loads and nuclear species, improving efficiency and homogeneity of power distribution, and allowing for precise tuning of resonant frequencies for different applications.
Implementation Method 1
a magnetic resonance antenna with capacitive and inductive oscillating circuit antenna elements, at least one radio-frequency switching element with which at least one of the oscillating circuit antenna elements that determines the resonant frequency of the antenna can be switched at radio frequency
Data Source
AI summary
A magnetic resonance antenna has capacitive and inductive oscillating circuit antenna elements at least one radio-frequency switching element with which at least one of the oscillating circuit antenna elements that determine the resonant frequency of the magnetic resonance antenna, can be switched at radio frequency between a permeable state and an impermeable state to change the resonant frequency of the magnetic resonance antenna, so the antenna can be detuned simply, cost-effectively and efficiently.