Horn-Shaped RF Shielding for MR Scanner Video Systems
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Solution Overview
Problem
In MR scanner examination chambers, existing image generation systems face challenges in providing effective RF shielding without distorting image data, especially when using complex video systems like cameras with infrared sensors or projectors, which often require additional lenses and prisms, leading to increased costs and complexity.
Innovation Solution
A system with a first RF shielding portion completely enclosing the image generating unit and a horn-shaped second RF shielding portion that connects mechanically and electrically around openings, allowing image data to be exchanged without additional optical devices, thereby achieving effective RF shielding by operating below the cut-off wavelength of RF signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If RF shielding is provided around video devices in the examination chamber, then electromagnetic interference with the MR scanner is reduced, but the structure becomes more complex and production costs increase
Solution Approach 1:
The horn-shaped RF shielding portion is integrated into the examination chamber structure, with the image generating unit positioned within the horn-shaped opening. This nesting approach allows the RF shielding to be part of the existing chamber structure rather than an separate enclosure, reducing overall system complexity while maintaining shielding effectiveness.
Solution Approach 2:
The invention uses a horn-shaped three-dimensional structure that extends into the examination chamber space. This dimensional approach allows RF shielding without requiring complete enclosure of the video devices, as the horn shape naturally directs and contains electromagnetic fields while leaving the optical path clear.
2Object-affected harmful factors
If a shielded waveguide is used to transfer the light beam, then RF shielding is achieved, but the waveguide length becomes very large and additional lenses and prisms are required
Solution Approach 1:
The invention extracts the RF shielding function from the optical path by using the horn-shaped structure as a separate electromagnetic field management component. The light beam travels freely through the examination chamber while the horn-shaped RF shielding portion manages electromagnetic fields without interfering with optical transmission, eliminating the need for integrated shielded waveguides and associated optical components.
Solution Approach 2:
The system separates the RF shielding function from the optical transmission function. The horn-shaped RF shielding portion handles electromagnetic field containment independently, while the optical path remains unobstructed. This segmentation allows each function to be optimized separately without compromising the other.
3Object-affected harmful factors
If an optically transparent window with electrically conductive film is used, then RF shielding is achieved, but infrared radiation from depth sensors is reflected and image distortion occurs
Solution Approach 1:
The horn-shaped RF shielding portion acts as an intermediary structure that manages electromagnetic fields without directly interfering with optical or infrared transmission. Rather than using a film that blocks or reflects certain wavelengths, the three-dimensional horn structure provides RF shielding through its geometry and electrical connection to ground, allowing all optical wavelengths to pass through unaffected.
4Object-affected harmful factors
If additional lenses and prisms are added to control the projection beam diameter, then RF shielding is improved, but production costs increase
Solution Approach 1:
The horn-shaped RF shielding portion serves multiple functions: it provides RF shielding, defines the optical path boundary, and structures the examination space. This multi-functionality eliminates the need for separate optical components that would otherwise be required to control beam diameter and shape, reducing production costs while maintaining RF shielding effectiveness.
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 configuration minimizes RF interference with MR systems, maintains image quality by avoiding optical distortion, and reduces production costs by eliminating the need for additional lenses or prisms, while achieving desired attenuation of RF fields.
Implementation Method 1
The horn-shaped second RF shielding portion is operated below its cut-off wavelength of such RF signals
Data Source
AI summary
In a method and apparatus for generating image data (other than magnetic resonance (MR) data) in an examination chamber of an MR scanner, an image generating unit generates the image data, a first RF-shielding portion completely encloses the image generating unit except for at least one opening for exchanging image data with the surrounding environment, and a horn-shaped second RF shielding portion is arranged around the at least one opening and is electrically connected with the first RF shielding portion such that the at least one opening opens into the horn-shaped second RF shielding portion.