Movable MRI RF Coil Layout for Stable Coupling and Sensitivity
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Solution Overview
Problem
Existing high-frequency coil devices for MRI apparatuses face challenges in maintaining a regular arrangement of coil units, leading to electromagnetic interference and reduced sensitivity due to varying subject sizes and mounting methods, particularly in movable coil units.
Innovation Solution
A high-frequency coil device with movable coil units that maintain a predetermined trajectory and positional relationship, ensuring consistent electromagnetic coupling and sensitivity by adjusting the distance and overlapping area between coil units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If coil units are made movable to adapt to varying subject sizes, then adaptability is improved, but electromagnetic interference increases due to changing positional relationships
Solution Approach 1:
The coil units are designed to be movable relative to each other, allowing the RF coil to adapt to different subject sizes and shapes. The movable configuration enables the coil units to maintain optimal positioning while accommodating variations in patient anatomy, thus improving adaptability without compromising electromagnetic interference suppression through the maintained regular arrangement.
2Adaptability or versatility
If coil units are made movable to improve adaptability, then adaptability is improved, but sensitivity decreases due to changes in magnetic coupling
Solution Approach 1:
The movable coil units are designed to maintain their regular arrangement and overlapping relationships during movement, ensuring that magnetic coupling between adjacent coils remains consistent. This dynamic design allows adaptation to different subject sizes while preserving the sensitivity required for high-quality imaging.
3Object-affected harmful factors
If elements are regularly arranged to suppress electromagnetic interference, then electromagnetic interference is reduced, but adaptability to varying subject sizes deteriorates
Solution Approach 1:
The RF coil incorporates movable coil units that can adjust their positions while maintaining the regular arrangement of conductor loops. This dynamic structure enables the coil to adapt to different subject sizes and shapes without disrupting the regular element arrangement, thereby suppressing electromagnetic interference while improving adaptability.
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 suppresses fluctuations in electromagnetic interference, allows for uniform sensitivity distribution, and enhances close contact with the subject, achieving high sensitivity regardless of subject size.
Implementation Method 1
maintaining electromagnetic coupling between a conductor loop of the first coil unit and an adjacent conductor loop of the second coil unit
Data Source
AI summary
A high-frequency coil device can maintain a distance between coils at any mounting position in an RF coil including a movable coil unit and can achieve a uniform sensitivity distribution and high sensitivity. A first coil unit configured to move along a substantially circular trajectory and a second coil unit fixed within the substantially circular trajectory are provided, the first coil unit and the second coil unit are disposed at substantially point-symmetric positions, and magnetic coupling between conductor loops provided in both the coil units is maintained substantially constant in a movable range of the first coil unit.