RF Coil Acoustic Noise Reduction via Vibration Decoupling
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Solution Overview
Problem
MR scanners face significant acoustic noise issues due to the RF coil, which is difficult to control due to its proximity to the patient, despite attempts at reducing noise through conductor breakup and constrained layer damping.
Innovation Solution
Incorporating a vibration decoupling layer between the RF conductor and support form, along with a mass loading layer attached to the RF conductor, to isolate vibrations and reduce acoustic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vibration isolation and mass loading are applied to reduce acoustic noise, then acoustic noise is reduced, but device complexity increases
Solution Approach 1:
A vibration decoupling layer is introduced as an intermediary element between the RF conductor and the RF support form. This layer acts as a mediator that isolates vibrations from the RF conductor, preventing them from being transmitted to the support form and reducing acoustic noise generation.
Solution Approach 2:
A mass loading layer is applied to the RF conductor to change its physical parameters, specifically increasing its mass. This parameter change lowers the natural frequency of the RF conductor, moving it away from the operating frequency and reducing vibration amplitude, thereby decreasing acoustic noise.
2Productivity
If the RF coil is positioned close to the patient bore for effective scanning, then scanning effectiveness is improved, but acoustic noise control becomes more difficult
Solution Approach 1:
The vibration decoupling layer serves as a protective intermediary between the RF conductor and the RF support form, specifically designed to attenuate vibration transmission. This allows the RF coil to maintain its optimal position close to the patient bore for effective scanning while the decoupling layer prevents excessive vibration from reaching the support form and generating noise.
3Object-affected harmful factors
If conventional noise reduction methods like conductor breakup and constrained layer damping are used, then some noise reduction is achieved, but all acoustic noise cannot be eliminated
Solution Approach 1:
The vibration decoupling layer provides a more effective intermediary solution compared to conventional methods. By placing this specialized damping layer directly between the RF conductor and support form, it more effectively interrupts vibration transmission paths, achieving superior noise reduction.
Solution Approach 2:
The mass loading layer fundamentally changes the dynamic parameters of the RF conductor by adding mass, which lowers its natural frequency. This parameter change works in conjunction with the vibration decoupling layer to achieve more complete noise elimination compared to conventional damping methods alone.
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
Effectively reduces acoustic noise by decoupling vibrations and lowering the natural frequency of the RF coil, thereby minimizing noise transmission to the support form.
Implementation Method 1
an isolating decoupling layer that is located between an RF conductor and an RF support form
Implementation Method 2
a mass loading layer is attached to the RF conductor
Implementation Method 3
The noise from the RF coil is due to Lorentz forces set up in the RF conductors
Data Source
AI summary
A system for isolating vibration and reducing acoustic noise in the RF coil of an MR imaging apparatus is presented. The system positions an RF conductor in its operative position proximate to an RF support form. The RF conductor is sandwiched between a vibration decoupling layer and a mass loading layer. The vibration decoupling layer is affixed to the RF support form so that the vibration decoupling layer is positioned between the RF conduit and the RF support form while the mass loading layer is located exterior of the RF conductor. By this arrangement, the acoustic energy is decoupled from the RF support form by the vibration decoupling layer while the vibration is reduced by the mass loading layer located exterior of the RF conductor.