MRI Vacuum Space Noise Reduction
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Solution Overview
Problem
MRI systems generate unpleasant acoustic noise due to vibrations of gradient coils and eddy currents, which are transmitted to patients through metallic components, causing discomfort during scans.
Innovation Solution
A vacuum or air space is created between the RF coil and the bore of the MRI system's gantry, with a patient enclosure tube positioned radially inward to block noise and decouple from vibrating structures, maintaining a low-pressure environment to reduce acoustic noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gradient coils are pulsed during imaging operation, then imaging function is achieved, but acoustic noise is generated due to vibrations in the static main magnetic field
Solution Approach 1:
A vacuum space is introduced as an intermediary medium between the gradient coils and the bore to block the transmission of acoustic noise. The vacuum acts as a mediator that prevents the harmful sound waves from reaching the patient while allowing the gradient coils to continue their imaging function normally.
Solution Approach 2:
The air medium that transmits acoustic noise is extracted from the space between the gradient coils and the bore by creating a vacuum. This removal of the transmission medium eliminates the pathway for noise propagation while preserving the functional integrity of the imaging system.
2Object-generated harmful factors
If a vacuum space is created between the RF coil and the bore, then acoustic noise transmission is reduced, but device complexity increases
Solution Approach 1:
The vacuum space serves as a simple yet effective intermediary that blocks noise transmission without requiring complex active noise control systems. This passive approach using a vacuum barrier achieves noise reduction while maintaining relatively simple system architecture.
3Productivity
If eddy currents are generated by gradient coils on metallic surfaces, then imaging operation continues, but vibrations are produced that result in acoustic noise
Solution Approach 1:
The vacuum space acts as a mediator that decouples the vibration source (gradient coils and eddy currents) from the transmission path to the patient. By removing air from the intervening space, the vacuum prevents mechanical vibrations from coupling to the bore and radiating as acoustic noise.
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
Significantly reduces acoustic noise experienced by patients during MRI scans, providing a more comfortable imaging experience and additional safety protection from thermal and electrical hazards.
Implementation Method 1
A vacuum or air space is created between the RF coil and the bore of the MRI system's gantry
Implementation Method 2
Significantly reduces acoustic noise experienced by patients during MRI scans
Data Source
AI summary
An apparatus and method to reduce noise in magnetic resonance imaging (MRI) systems are provided. One MRI system includes a gantry having a bore therethrough and at least one radio frequency (RF) coil supported by the gantry for imaging an object within the bore. The MRI system also includes a vacuum space between the at least one RF coil and the bore.