Gradient Coil Grouping for MRI Field Versatility
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Solution Overview
Problem
Current methods for generating gradient magnetic fields in MRI systems are inefficient, leading to challenges in creating uniform gradient magnetic fields, which affects the quality of magnetic resonance imaging.
Innovation Solution
A gradient magnetic field generation module comprising a gradient coil and a gradient amplifier that controls the shape, strength, and slew rate of the magnetic field by grouping coils and independently controlling current flow, allowing for the generation of various gradient magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single uniform gradient magnetic field generation method is used, then the system structure is simple, but the ability to generate various gradient magnetic fields is limited
Solution Approach 1:
The gradient coil is divided into multiple independent coil groups (first, second, third, and fourth coil groups) that can be independently controlled. Each coil group can generate gradient magnetic fields with different characteristics, allowing the system to produce various gradient magnetic field patterns by selectively activating and combining different coil groups, thereby achieving versatility without requiring entirely separate coil systems.
Solution Approach 2:
The system employs dynamic control of current flow through the coil groups via the gradient amplifier, which can independently adjust the magnitude and direction of current in each coil group. This dynamic control capability enables the system to adaptively generate different gradient magnetic field configurations (e.g., linear, non-linear, asymmetric gradients) by varying current parameters in real-time, achieving versatility through dynamic parameter adjustment rather than fixed structural configurations.
2Adaptability or versatility
If multiple independent coils are used to generate various gradient magnetic fields, then the versatility is improved, but the control complexity increases
Solution Approach 1:
Multiple coil groups are electrically connected to a single gradient amplifier that provides unified control for all coil groups. The gradient amplifier integrates the control functions for generating different gradient magnetic field patterns, allowing the operator to control the entire multi-coil system through a single device interface. This merging of control functions simplifies the ease of operation while maintaining the versatility of generating various gradient magnetic fields through coordinated activation of different coil groups.
3Manufacturing precision
If conventional gradient field generation is used, then the system is simple to operate, but the image quality and uniformity are insufficient
Solution Approach 1:
Different coil groups are positioned and configured to provide locally optimized gradient magnetic field characteristics. The first and second coil groups can generate gradients in one direction while the third and fourth coil groups generate gradients in perpendicular directions, with each group tailored to provide uniform field distribution in its specific spatial region. This local optimization approach enables the system to achieve high overall uniformity by combining multiple locally-optimized gradient fields, overcoming the limitations of conventional single-configuration gradient coils.
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
Enables efficient generation of various gradient magnetic fields, improving the quality of MRI images by precisely controlling the magnetic field characteristics.
Implementation Method 1
a gradient coil formed inside a main magnet and generating a gradient magnetic field and including a plurality of coils
Data Source
AI summary
Provided is a gradient magnetic field generation module using multiple coils to generate a gradient magnetic field. Provided is a gradient magnetic field generation module including: a gradient coil formed inside a main magnet and generating a gradient magnetic field and including a plurality of coils; and a gradient amplifier controlling at least one of a shape of the gradient magnetic field, a strength of the gradient magnetic field, and slew rate of the gradient magnetic field generated by the gradient coil, in which the plurality of coils is grouped into a plurality of coil groups and current which flows in the plurality of coils is independently controlled by the unit of a group by the gradient amplifier.