Dual-Nuclear RF Coil With Orthogonal Dipole and Loop
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Solution Overview
Problem
Current dual-nuclear RF coils face challenges in achieving high signal-to-noise ratio and uniform RF magnetic fields, particularly in high magnetic field MRI systems, due to coupling between coils and non-uniformity of the RF magnetic field, which affects image quality.
Innovation Solution
A dual-nuclear RF coil device comprising a loop structure first RF coil and an electric dipole second RF coil, with a tuning and matching circuit, where the electric dipole is centered within the loop structure and an insulating layer separates them, allowing for perpendicular magnetic field directions to minimize coupling and enhance field uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two independent coil loops are used for dual-nuclear RF coils, then dual-nuclear resonance can be achieved, but coupling exists between the two coils which directly affects the signal-to-noise ratio of the image
Solution Approach 1:
An insulating layer is introduced as an intermediary between the electric dipole and the loop structure, serving as a physical barrier that reduces electromagnetic coupling between the two coil systems while allowing each to function independently for dual-nuclear resonance
2Reliability
If the primary magnetic field intensity is increased to improve signal-to-noise ratio and resolution, then better image quality is achieved, but the operating frequency of RF coils increases causing shorter RF wavelength and more apparent non-uniformity of RF magnetic field which seriously affects image contrast and quality
Solution Approach 1:
The patent combines two different coil structures (loop and electric dipole) with orthogonal orientations into a composite dual-nuclear RF coil system. This composite structure leverages the complementary characteristics of each coil type to generate more uniform RF magnetic fields at ultra-high field strengths, overcoming the limitations of single-coil designs
3Adaptability or versatility
If a fixed capacitor is connected in parallel with an inductor in a coil loop to achieve dual-nuclear resonance, then high and low frequency resonance can be achieved, but the signal-to-noise ratio of the high-frequency coil is low and difficulty in implementing a match circuit at high and low frequencies
Solution Approach 1:
The patent segments the dual-nuclear RF coil into two independent coil systems (loop structure and electric dipole) rather than using a single coil with parallel capacitors. This segmentation allows each coil to be optimized for its specific frequency range, improving signal-to-noise ratio and simplifying impedance matching circuits for each nucleus
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 configuration reduces coupling between RF coils, improves the uniformity of the RF magnetic field, and enhances the signal-to-noise ratio and image quality, especially in high magnetic field MRI systems.
Implementation Method 1
The first RF coil is configured to generate a first magnetic field
Implementation Method 2
The second RF coil is configured to generate a second magnetic field
Implementation Method 3
an insulating layer is disposed between the electric dipole and the first RF coil
Data Source
AI summary
A dual-nuclear radio frequency (RF) coil device includes a first RF coil and a second RF coil. The first RF coil includes at least one adjustment capacitor, the first RF coil is configured to generate a first magnetic field, and a direction of a primary magnetic field of the first magnetic field is a first direction. The second RF coil includes an electric dipole and a tuning and matching circuit connected between two conductors of the electric dipole. The second RF coil is configured to generate a second magnetic field and a direction of a primary magnetic field of the second magnetic field is a second direction; the electric dipole is disposed in a center line of the first RF coil and an insulating layer is disposed between the electric dipole and the first RF coil; and the first direction is perpendicular to the second direction.