Gradient Amplifier Filter PCB With Non-Magnetic Inductors
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Solution Overview
Problem
The challenge in magnetic resonance systems is that gradient amplifiers, when placed near the main magnet, experience magnetic saturation due to the strong magnetic field, leading to imaging quality issues, and conventional filters fail to provide adequate noise filtering in complex spatial arrangements.
Innovation Solution
A gradient amplifier filter comprising non-magnetic core inductors and a multilayer printed circuit board with filter capacitors is integrated into the scan room, avoiding magnetic saturation and providing effective noise filtering for gradient coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the gradient amplifier is placed close to the main magnet, then the imaging quality is improved, but magnetic saturation occurs due to the influence of the main magnetic field
Solution Approach 1:
A filter circuit is introduced as an intermediary component between the gradient amplifier and the gradient coil. The filter circuit includes inductors and capacitors that act as a buffer, isolating the gradient amplifier from the direct influence of the main magnetic field while still allowing the gradient signal to pass through to the coil for imaging.
Solution Approach 2:
The gradient amplifier is extracted from the scan room and placed in the equipment room, separating it from the main magnet's magnetic field. Only the filter circuit remains in the scan room near the main magnet, extracting the harmful magnetic field influence from the amplifier while maintaining the imaging function.
2Object-affected harmful factors
If the gradient amplifier is placed in the equipment room, then magnetic saturation is avoided, but the space in the scan room is insufficient
Solution Approach 1:
The system is segmented into two functional parts: the gradient amplifier is placed in the equipment room, while only the compact filter circuit is installed in the scan room near the main magnet. This segmentation allows the amplifier to be远离 the magnetic field while maintaining proximity to the coil through the filter circuit.
Solution Approach 2:
The filter circuit serves as a spatial intermediary, bridging the gap between the gradient amplifier in the equipment room and the gradient coil in the scan room. It enables the amplifier to be located far from the main magnet while still providing the necessary gradient signal to the coil.
3Reliability
If a filter circuit with magnetic core inductors is used, then the filtering effect is improved, but magnetic saturation occurs due to the main magnetic field influence
Solution Approach 1:
The inductors in the filter circuit are designed with air cores instead of magnetic cores. This parameter change in the inductor construction eliminates the magnetic saturation problem caused by the main magnetic field while maintaining the filter circuit's ability to block high-frequency noise and amplify the gradient signal.
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 design ensures low-noise drive signals are delivered to gradient coils, maintaining imaging quality by preventing magnetic saturation and achieving high-frequency filtering, even in proximity to the main magnet.
Implementation Method 1
a plurality of non-magnetic core inductors and a printed circuit board having a multilayer structure, a plurality of filter capacitors being formed in a plurality of regions of the printed circuit board, respectively, wherein each non-magnetic core inductor is provided on the printed circuit board and across two of the plurality of filter capacitors
Data Source
AI summary
The present invention relates to a magnetic resonance system and a gradient amplifier filter for a magnetic resonance system. The filter includes a plurality of non-magnetic core inductors and a printed circuit board having a multilayer structure, a plurality of filter capacitors being formed in a plurality of regions of the printed circuit board, respectively, wherein each non-magnetic core inductor is provided on the printed circuit board and spanning two of the plurality of filter capacitors.