Gradient Magnetic Field Power Supply Crosstalk Reduction
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Solution Overview
Problem
The existing MRI systems face issues with crosstalk between gradient magnetic field power supply cables, leading to inaccurate current measurement and output, which affects the quality of the magnetic flux and subsequently the MR images due to the parallel arrangement of current sensors.
Innovation Solution
The implementation of a second current sensor with a direction that crosses the direction of the current flowing through adjacent cables, ensuring the normal vector is not parallel to the current vector, thereby reducing crosstalk and improving output accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current sensors are arranged in parallel to measure current in adjacent cables, then current measurement capability is improved, but crosstalk between cables occurs leading to measurement inaccuracy
Solution Approach 1:
The patent changes the spatial arrangement of current sensors from a parallel configuration to a crossing configuration. The second current sensor is arranged to cross the first cable at a predetermined position, and the first current sensor crosses the second cable, forming a crossed arrangement in space. This dimensional change in sensor placement eliminates crosstalk while maintaining measurement capability.
Solution Approach 2:
The patent introduces asymmetric arrangement of current sensors relative to the cables. Instead of symmetric parallel placement, the sensors are positioned asymmetrically such that they cross each other's cable paths. This asymmetric configuration ensures that the magnetic flux detected by each sensor is primarily from its intended cable, reducing interference from adjacent cables.
2Adaptability or versatility
If current sensors are placed to detect magnetic flux from adjacent cables, then monitoring capability is improved, but output accuracy deteriorates due to crosstalk
Solution Approach 1:
The patent employs a crossed spatial arrangement where current sensors intersect cable paths in three-dimensional space rather than running parallel. This dimensional reconfiguration allows sensors to monitor their designated cables while avoiding detection of magnetic flux from adjacent cables, thus maintaining monitoring capability without sacrificing output accuracy.
Solution Approach 2:
The patent effectively extracts the harmful crosstalk component from the measurement system by repositioning sensors. Each current sensor is positioned to extract only the magnetic flux signal from its intended cable, excluding interference from adjacent cables through the crossed arrangement geometry.
3Device complexity
If cables are arranged parallel for compact design, then device complexity is reduced, but measurement reliability deteriorates due to crosstalk
Solution Approach 1:
The patent resolves the conflict between compact parallel cable arrangement and measurement reliability by moving the sensors to a crossed configuration in space. This allows cables to remain in a simple parallel arrangement for compactness while sensors cross them at predetermined positions, ensuring reliable crosstalk-free measurements.
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 suppresses crosstalk between cables, ensuring accurate current measurement and enhanced output current control, resulting in improved magnetic flux and image quality.
Implementation Method 1
a current sensor which measures a current value by detecting a magnetic flux generated by a current flowing through a part of a cable
Data Source
AI summary
A gradient magnetic field power supply, connected to a first coil and a second coil for each applying a gradient magnetic field to an object, the power supply, according to an embodiment includes a first current sensor and a second current sensor. The second current sensor is provided such that a direction of a current detectable by the second current sensor crosses a direction of a current detectable by the first current sensor.