RF Coil Foam Support for MRI Noise Reduction
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Solution Overview
Problem
Magnetic Resonance Imaging (MRI) systems generate significant acoustic noise due to mechanical vibrations from gradient coils, which compromises patient comfort and requires hearing protection.
Innovation Solution
The development of RF MR imaging coils with a 'birdcage' topology using foam substrates for mechanical support, eliminating rigid connections to gradient systems and incorporating sound-absorbing materials to reduce noise propagation, along with vibration isolation suspension members to minimize acoustic noise exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rigid connections are used to support the RF coil, then mechanical stability is improved, but acoustic noise increases
Solution Approach 1:
The patent introduces foam substrates as intermediary elements between the RF coil and the gradient system. These foam substrates provide mechanical support and positioning while isolating the RF coil from vibrations generated by the gradient coils, thereby reducing acoustic noise without compromising mechanical stability
Solution Approach 2:
The patent employs flexible foam materials to construct the RF coil support structure. These flexible materials can accommodate mechanical movements and vibrations from the gradient system while maintaining the RF coil's positional stability, thus reducing noise transmission
2Object-generated harmful factors
If sound-absorbing materials are incorporated, then acoustic noise is reduced, but device complexity increases
Solution Approach 1:
The patent combines the sound-absorbing function with the existing RF coil structure by integrating foam substrates that serve dual purposes: providing mechanical support/positioning and absorbing acoustic noise. This merging of functions adds noise reduction capability without significantly increasing device complexity
Solution Approach 2:
The foam substrates perform multiple functions simultaneously: mechanical support, positioning, vibration isolation, and acoustic noise absorption. This multi-functionality allows the device to achieve noise reduction without adding separate dedicated components, thereby avoiding excessive complexity
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 attenuates acoustic noise, enhancing patient comfort and reducing noise levels during MRI scans, while maintaining the functionality of RF excitation and signal detection.
Implementation Method 1
incorporating sound-absorbing materials to reduce noise propagation
Implementation Method 2
vibration isolation suspension members to minimize acoustic noise exposure
Data Source
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AI summary
An RF coil assembly for use in a Magnetic Resonance Imaging scanner incorporates sound absorbing material in its construction for the purpose of attenuating the sound perceived by a patient lying inside the RF coil. Unlike a conventional RF coil assembly in which rigid components are used to support the coil within the magnet bore, the quiet RF coil assembly is constructed without rigid support components. In one embodiment, open cell foam may be used to support the RF coil components and the entire assembly is wrapped in a. flexible cloth-like material.