MRI Cable Sensor for Interference Detection and Suppression
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Solution Overview
Problem
Magnetic resonance tomographs require complex shielding to reduce electromagnetic interference and emissions, which increases costs and complexity, while existing interference suppression methods are inefficient in distinguishing and effectively eliminating interference signals from useful signals.
Innovation Solution
A magnetic resonance tomograph with an electrical connection line that includes an interference conductor and a sensor coupled to it, capable of detecting and forwarding interference signals to a controller for suppression, using directional couplers and resonant elements to differentiate and reduce interference signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If elaborate shielded cabins are installed around MRI scanners to reduce electromagnetic interference, then shielding effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the interference suppression function from the physical shielding structure and relocates it to the signal processing domain. By using sensors to detect interference signals and digitally subtracting them from the MRI signals, the system eliminates the need for elaborate shielded cabins while maintaining shielding effectiveness.
Solution Approach 2:
The patent replaces the mechanical/physical shielding system (shielded cabins) with an electronic/digital interference suppression system. Instead of using physical barriers to block electromagnetic interference, the system uses sensors and signal processing to detect and eliminate interference electronically, reducing structural complexity.
2Object-affected harmful factors
If existing interference suppression methods are used, then some interference reduction is achieved, but measurement precision and effectiveness are insufficient
Solution Approach 1:
The patent introduces sensors as intermediary devices that specifically detect interference signals on power supply lines and other conductors. These sensors act as mediators between the interference source and the MRI signal processing system, enabling precise detection and subsequent digital subtraction of interference signals.
Solution Approach 2:
The patent implements a feedback mechanism where sensors continuously monitor interference signals, and the detected interference is fed back into the signal processing system for subtraction. This closed-loop approach ensures that interference is detected and suppressed in real-time, improving measurement precision.
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 solution allows for precise recognition and suppression of interference signals at their source, improving image quality by reducing artifacts and emissions, thus reducing the need for extensive shielding and enhancing operational efficiency.
Implementation Method 1
The sensor (60) is electrically and/or magnetically coupled to the interference line (33)
Implementation Method 2
an inductively or 'wirelessly' coupled, multi-channel antenna matrix is known
Implementation Method 3
the sensor (60) is resonant at a Larmor frequency of the magnetic resonance tomograph (1)
Implementation Method 4
The cable has electrical conductors (33) that can carry an electric current. Due to their electrical conductivity, the conductors also act as antennas for electromagnetic waves and can therefore capacitively or inductively absorb or transmit electrical interference
Data Source
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AI summary
The invention relates to a cable (33) for an electrical connection in a magnetic resonance imaging (MRI) scanner (1) and to a MRI scanner (1) with a corresponding cable. The cable includes an electrical interference conductor that can receive and/or radiate an electromagnetic interference signal from the environment. The cable further includes a sensor (60) that is electrically and/or magnetically coupled to the interference conductor (33).