Decoupling Inductor Assembly for MRI RF Coil Noise Reduction
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Solution Overview
Problem
Existing MRI systems face challenges in reducing noise and increasing the signal-to-noise ratio (SNR) due to inductive coupling between RF phased array coils, which current decoupling methods struggle to effectively address, especially in adjusting coupling inductance without redesigning existing decoupling inductor assemblies.
Innovation Solution
A decoupling inductor assembly is designed with overlapping solenoids and port pairs, allowing for adjustment of coupling inductance by connecting capacitors or inductors in parallel, and optionally using microstrip lines, to optimize the decoupling of adjacent coil units in RF receiving coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inductive decoupling is employed by connecting decoupling inductor assemblies to coil units, then inductive coupling between coil units is reduced and noise is decreased, but the coupling inductance cannot be adjusted without redesigning the entire decoupling inductor assembly
Solution Approach 1:
The decoupling inductor assembly is segmented into a fixed solenoid portion and an adjustable inductor portion. The fixed solenoid provides stable inductive decoupling, while the adjustable inductor (with selectable windings or taps) allows independent adjustment of coupling inductance without redesigning the entire assembly. This segmentation enables both noise reduction and adaptability.
Solution Approach 2:
The decoupling inductor assembly incorporates dynamic adjustability through multiple inductor windings with selectable connections (taps). The coupling inductance can be dynamically adjusted by selecting different winding configurations or connection points, allowing the system to adapt to different coil unit configurations and spacing without physical redesign.
2Reliability
If the cross-sectional area, number of turns, and winding density of inductive coils are adjusted to vary coupling inductance, then decoupling performance is improved, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The inductor is divided into multiple discrete windings or sections with standardized geometries. Each winding has predetermined characteristics, and the desired coupling inductance is achieved by selecting and connecting appropriate sections rather than customizing the entire inductor structure. This reduces manufacturing complexity while maintaining decoupling performance.
Solution Approach 2:
Instead of changing the physical geometry (cross-sectional area, winding density) of the entire inductor, the coupling inductance is adjusted by changing the electrical connection configuration (selecting different taps or windings). This parameter change approach maintains simple, standardized inductor structures while achieving variable decoupling performance.
3Adaptability or versatility
If existing decoupling inductor assemblies are modified to adjust coupling inductance, then adaptability is improved, but extensive redesign is required
Solution Approach 1:
The decoupling inductor assembly is manufactured in advance with multiple pre-configured inductor windings and connection points (taps). This preliminary preparation allows the assembly to be adapted to different applications by simply selecting the appropriate pre-built configuration, eliminating the need for extensive redesign or custom manufacturing for each application.
Solution Approach 2:
The decoupling inductor assembly is designed as a universal component with multiple inductor windings that can serve different coupling inductance requirements. The same physical assembly can be configured for various applications by selecting different winding combinations, reducing the need for multiple specialized designs and simplifying manufacturing.
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 effectively adjusts coupling inductance, reducing noise and enhancing the signal-to-noise ratio in MRI systems, while allowing for flexibility in modifying existing decoupling inductor assemblies without extensive redesign.
Implementation Method 1
Inductive coupling will exist between any two coil units (e.g., surface coil units) that are close to each other, and inductive coupling will give rise to noise. Inductive decoupling is achieved by connecting inductively coupled coil units to a decoupling inductor assembly separately to eliminate the inductive coupling.
Implementation Method 2
A capacitor may be connected in parallel at a first port pair of the first inductor and/or at a second port pair of the second inductor.
Data Source
AI summary
A decoupling inductor assembly, an RF receiving coil, and an MRI apparatus are provided. The decoupling inductor assembly includes a first inductor and a second inductor. The first inductor includes a first solenoid and a first port pair located at two ends of the first solenoid, and the second inductor includes a second solenoid and a second port pair located at two ends of the second solenoid. The first solenoid and the second solenoid are wound partially or completely overlapped. The first port pair includes at least one pair of first parallel connection interfaces, and the second port pair includes at least one pair of second parallel connection interfaces.