MRI Transmission Cable Traps with Opposite Helical Coils
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Solution Overview
Problem
Existing traps for suppressing common-mode currents in MRI transmission cables are either too large and heavy due to their design, or they generate significant heat, making them inefficient for advanced MRI systems with thicker cables.
Innovation Solution
A transmission cable assembly with detachable traps featuring a first coil and a second coil wound in opposite helical directions, forming a resonant circuit to reduce common-mode currents, and optionally including tuning capacitors and a bracket for support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cable traps are designed with large inductance to suppress common-mode currents, then interference suppression performance is improved, but the trap volume and weight increase significantly
Solution Approach 1:
The trap is divided into multiple independent coil units (first coil, second coil, third coil, fourth coil) that can be separately wound and assembled. Each coil contributes to the overall inductance, allowing the trap to achieve high inductance through cumulative effect rather than requiring a single large coil, thus reducing weight and volume.
Solution Approach 2:
The coils are wound in a nested configuration where inner coils are positioned within the structure of outer coils. This nested arrangement maximizes the use of space, allowing multiple coils to occupy minimal volume while their combined inductance provides effective common-mode current suppression.
2Object-affected harmful factors
If cable traps are designed with large inductance to suppress common-mode currents, then interference suppression performance is improved, but the trap volume increases
Solution Approach 1:
The trap is divided into multiple independent coil units (first coil, second coil, third coil, fourth coil) that can be separately wound and assembled. Each coil contributes to the overall inductance, allowing the trap to achieve high inductance through cumulative effect rather than requiring a single large coil, thus reducing weight and volume.
Solution Approach 2:
The coils are wound in a nested configuration where inner coils are positioned within the structure of outer coils. This nested arrangement maximizes the use of space, allowing multiple coils to occupy minimal volume while their combined inductance provides effective common-mode current suppression.
3Object-affected harmful factors
If floating traps are designed with large diameter to suppress common-mode currents, then interference suppression performance is improved, but the trap weight increases
Solution Approach 1:
The trap is divided into multiple independent coil units (first coil, second coil, third coil, fourth coil) that can be separately wound and assembled. Each coil contributes to the overall inductance, allowing the trap to achieve high inductance through cumulative effect rather than requiring a single large coil, thus reducing weight and volume.
Solution Approach 2:
Different coils are positioned at different locations around the transmission cable with specific winding directions (first and second coils wound in one direction, third and fourth coils wound in opposite direction). This localized arrangement optimizes the magnetic field distribution for effective common-mode suppression while minimizing overall trap size and weight.
4Object-affected harmful factors
If cable traps are designed with large inductance to suppress common-mode currents, then interference suppression performance is improved, but heat generation increases
Solution Approach 1:
The trap is divided into multiple independent coil units (first coil, second coil, third coil, fourth coil) that can be separately wound and assembled. Each coil contributes to the overall inductance, allowing the trap to achieve high inductance through cumulative effect rather than requiring a single large coil, thus reducing weight and volume.
Solution Approach 2:
Different coils are positioned at different locations around the transmission cable with specific winding directions (first and second coils wound in one direction, third and fourth coils wound in opposite direction). This localized arrangement optimizes the magnetic field distribution for effective common-mode suppression while minimizing overall trap size and weight.
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 solution effectively suppresses common-mode currents while being smaller, lighter, and generating less heat compared to conventional traps, thus improving image quality in MRI systems.
Implementation Method 1
The first coil and the second coil form a resonant circuit
Implementation Method 2
The first coil and a second coil in opposite helical directions and assembled to allow the transmission cable to insert through. The first coil and the second coil circumferentially surround at least a portion of the transmission cable.
Data Source
AI summary
Transmission cable assemblies and methods for suppressing common-mode currents on a transmission cable are provided. The transmission cable assembly may include a transmission cable and at least one trap fitted on the transmission cable. Each trap may include a first coil and a second coil in opposite helical directions and assembled to allow the transmission cable to insert through. The first coil and the second coil form a resonant circuit for reducing common-mode currents on the transmission cable. When there are multiple traps fitted on the transmission cable, they are spaced apart along the longitudinal axis of the transmission cable and an insulating component is placed between every two adjacent traps. The designs can make the trap filters smaller and lighter in weight while effectively reducing the impact on the local radiofrequency (B1) field.