MRI Beam Projector Coil Orientation for Noise Reduction
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Solution Overview
Problem
MRI apparatuses face challenges in maintaining patient comfort and image quality due to the confined space within the bore, leading to potential patient movement and image degradation, and existing solutions like beam projectors introduce noise due to magnetic field interactions.
Innovation Solution
An MRI apparatus with a beam projector disposed in the bore that projects images onto the inner wall, featuring a coil structure aligned parallel to the main magnetic field to minimize noise and includes a detachable module for power and video signal transfer, luminance control, and a heat dissipating module, ensuring comfortable imaging and high-quality MR captures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a beam projector is disposed in the bore to display images, then patient comfort is improved, but noise of audible frequency band occurs due to magnetic field interactions
Solution Approach 1:
The patent applies the principle of converting harm into benefit by utilizing the main magnetic field of the MRI system to counteract the magnetic field generated by the beam projector's coil. The coil is specifically oriented so that its magnetic field direction is parallel to the main magnetic field direction, allowing the strong main magnetic field to cancel out the projector's magnetic field. This conversion transforms the potentially harmful magnetic field interaction into a beneficial noise-reduction mechanism, eliminating audible frequency noise while maintaining image projection functionality in the bore.
Solution Approach 2:
The patent applies parameter changes by modifying the orientation parameter of the coil's magnetic field to be parallel with the main magnetic field. This specific parameter adjustment (orientation alignment) enables the magnetic fields to interact constructively for noise cancellation. By changing the coil's spatial parameter and aligning it with the main magnetic field, the system transforms the magnetic field interaction from a noise-generating effect to a noise-reducing effect, thereby resolving the contradiction between patient comfort and noise generation.
2Manufacturing precision
If the bore space is reduced to accommodate the patient, then imaging capability is improved, but patient comfort deteriorates due to confined space
Solution Approach 1:
The patent applies the principle of multi-functionality by integrating the beam projector into the MRI bore structure, making the bore serve dual purposes: maintaining its primary function for high-quality imaging while simultaneously functioning as a display environment for patient entertainment. The projector is specifically designed to project images onto the inner wall of the bore, transforming the confined space from a purely functional imaging chamber into a multi-functional environment that provides both diagnostic capability and patient comfort through visual content display.
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 reduces noise interference and enhances patient comfort by providing engaging content within the bore while maintaining image quality, addressing both the confined space issues and noise problems.
Implementation Method 1
the beam projector includes at least one coil, and the beam projector is disposed such that a direction of a magnetic field, which is generated when a current is applied to the at least one coil, is parallel to a direction of the main magnetic field in the bore
Implementation Method 2
a magnet assembly disposed in the housing and being configured to generate main magnetic field for capturing a magnetic resonance (MR) image of an object
Implementation Method 3
a radio frequency (RF) coil that is used to apply an electromagnetic wave to the human body for resonating an internal magnetization vector of the human body, and to receive a magnetic resonance (MR) signal
Data Source
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Figure 3
Figure 4~6
AI summary
The MRI apparatus includes a housing that includes a bore in which a first magnetic field for capturing a MR image is generated, a beam projector that is disposed in the bore of the housing during capture of the MR image and projects an image onto an inner wall included in the bore, and a controller that controls the beam projector, and transfers a video signal to the beam projector. The beam projector includes a coil which is disposed so that a direction of a second magnetic field, which is generated with a current applied to the coil, is parallel to a direction of the first magnetic field.