MRI Electromagnet Coil Design to Reduce Mutual Inductance
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Solution Overview
Problem
Magnetic resonance imaging (MRI) systems face issues with magnetic coupling between electromagnets, leading to imaging artifacts and increased complexity and cost due to the need for additional coils or amplifiers to mitigate mutual inductance.
Innovation Solution
A computing device is used to design electromagnet coils by generating a coil surface representation, defining performance metric functions including mutual inductance, optimizing the performance functional, and obtaining coil windings to minimize mutual inductance between coils, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If additional coils or amplifiers are added to mitigate mutual inductance, then magnetic coupling interference is reduced, but device complexity and cost increase
Solution Approach 1:
The patent applies preliminary action by optimizing the coil winding geometry during the design phase to minimize mutual inductance. The coil surface representation and windings are specifically configured before assembly to reduce magnetic coupling effects, eliminating the need for additional corrective coils or amplifiers that would increase system complexity.
2Object-affected harmful factors
If additional coils or amplifiers are added to mitigate mutual inductance, then magnetic coupling interference is reduced, but manufacturing cost increases
Solution Approach 1:
The invention performs preliminary optimization of the coil windings on the coil surface representation to minimize mutual inductance effects. This upfront design optimization eliminates the need for additional corrective components, thereby reducing manufacturing costs while effectively mitigating magnetic coupling interference.
3Measurement precision
If coil windings are optimized to minimize mutual inductance, then image quality improves, but coil design complexity increases
Solution Approach 1:
The patent replaces complex mechanical coil design and adjustment processes with computational optimization. By using computer-based optimization of the coil surface representation and windings, the system achieves minimal mutual inductance and high image quality without requiring complex manual design iterations or adjustments.
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 approach effectively reduces mutual inductance between coils, improving image quality without the need for additional coils or amplifiers, thus simplifying the MRI system and reducing costs.
Implementation Method 1
a pair of electromagnets may induce current in one another (referred to as magnetic coupling, or mutual inductance)
Data Source
AI summary
A method of manufacturing an electromagnet coil for use in a magnetic resonance imaging (MRI) system includes: generating a coil surface representation defining a surface to contain the electromagnet coil; defining a set of performance metric functions, the set including a mutual inductance function defining mutual inductance between the electromagnet coil and a second electromagnet coil; defining a performance functional based on the coil surface representation and the set of performance metric functions; optimizing the performance functional; generating a current density pattern over the coil surface representation based on the optimized performance functional; and obtaining coil windings defining the electromagnet coil from the current density pattern.