MRI Shielding Element Placement for Electrical Component Protection
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Solution Overview
Problem
Magnetic resonance imaging devices face challenges in shielding electrical components from strong magnetic fields generated by coil arrangements, which can affect the correct operation of these components and the imaging process, especially when complete or partial shielding outside the device is not feasible or desired.
Innovation Solution
A magnetic resonance imaging device with a magnetic shielding element placed centrally between two coil rings outside the inner volume, which shields electrical components from the magnetic field, minimizing interference with the imaging process and allowing for a compact, efficient shielding design that reduces material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic shielding element is used to shield electrical components from stray magnetic fields, then the electrical components are protected from magnetic field interference, but the shielding element may influence the imaging process
Solution Approach 1:
The magnetic shielding element is designed with non-magnetic openings that allow magnetic field lines to pass through, creating local variations in magnetic permeability. This local quality approach enables the shielding element to provide magnetic shielding where needed while maintaining magnetic field homogeneity in the imaging region, thus protecting electrical components without significantly degrading imaging quality.
2Reliability
If the entire magnetic resonance imaging device is arranged in a shielded room, then electrical components are protected from magnetic field interference, but the device complexity and space requirements increase
Solution Approach 1:
Instead of implementing a complete shielded room, the magnetic shielding is segmented into individual magnetic shielding elements placed only where electrical components are located. These discrete shielding elements provide the necessary magnetic protection without requiring a comprehensive shielding structure, thereby reducing device complexity and space requirements while maintaining electrical component reliability.
3Reliability
If electrical components are arranged outside the shielded room, then magnetic field interference is avoided, but the device complexity and connection requirements increase
Solution Approach 1:
The magnetic shielding element acts as an intermediary structure that allows electrical components to be positioned within the magnetic field environment while still providing protection. This intermediary approach enables components to remain integrated into the device structure without requiring external placement, thus avoiding the complexity of external connections while maintaining electrical component operation reliability.
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 effectively shields electrical components from stray magnetic fields while maintaining the homogeneity of the magnetic field within the imaging region, reducing unwanted magnetization and forces on components, and minimizing the shielding's influence on the imaging process.
Implementation Method 1
the shielding element shields the electrical component from the magnetic field outside of the inner volume
Data Source
AI summary
A magnetic resonance imaging device includes at least one magnetic shielding element, an electrical component and a coil arrangement including at least two coil rings. In an embodiment, the coil rings are arranged offset along a longitudinal direction of a patient receptacle and the coil arrangement is embodied to form a magnetic field in an inner volume surrounded partially by the coil rings and at least partially including the patient receptacle. Further, in an embodiment, the shielding element and the electrical component outside of the inner volume are arranged in the longitudinal direction centrally between the coil rings and the shielding element shields the electrical component from the magnetic field outside of the inner volume.