Portable Faraday Cage for MRI Accessory RF Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic Resonance Imaging (MRI) systems face challenges in reducing radiofrequency (RF) interference from accessory equipment within the MR scanner room, which degrades image quality and can prevent MR signal acquisition.
Innovation Solution
A portable Faraday cage is designed to attenuate RF noise by using a penetration panel for filtered electrical connections and waveguides to accommodate accessory equipment, such as infusion pumps, while blocking RF signals below the Larmor frequency of the MR scanner, allowing these devices to operate within the MR scanner room during imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If accessory equipment is placed inside the MR scanner room, then patient monitoring and treatment can be provided during scanning, but RF interference degrades image quality and prevents signal acquisition
Solution Approach 1:
The Faraday cage is divided into modular sections with separate penetration panels for different types of equipment (infusion pumps, monitors, etc.). Each piece of accessory equipment can be independently enclosed in its own shielded compartment, allowing selective RF filtering while maintaining access to multiple devices simultaneously.
Solution Approach 2:
The Faraday cage acts as an intermediary structure between the accessory equipment and the MR imaging environment. It mediates the RF signals by allowing necessary electrical connections while blocking harmful RF interference, enabling equipment operation without degrading image quality.
2Object-affected harmful factors
If a Faraday cage is used to block RF signals, then RF interference is reduced, but access for electrical connections and patient lines is restricted
Solution Approach 1:
The penetration panels incorporate localized access points with different filtering characteristics. Power connections use one type of filtered access while patient monitoring lines use another, allowing each connection type to have optimized RF filtering while maintaining operational ease for its specific function.
Solution Approach 2:
The penetration panels are pre-configured with filtered electrical connections and waveguide structures before equipment installation. This preliminary setup eliminates the need for complex RF shielding modifications during equipment setup, making the system easier to operate while maintaining RF blocking effectiveness.
3Object-affected harmful factors
If conventional RF shielding is used in the MR scanner room, then RF interference is blocked, but accessory equipment cannot operate within the room
Solution Approach 1:
The Faraday cage serves as an intermediary enclosure that allows accessory equipment to operate inside the MR scanner room by providing localized RF shielding. The penetration panels mediate between the equipment's electrical needs and the MR environment's RF requirements, enabling equipment operation without room-wide shielding that would prevent functionality.
Solution Approach 2:
The system changes the RF parameter environment locally around each piece of accessory equipment through individual Faraday cages with penetration panels. This allows different RF conditions (shielded for equipment, open for imaging) to coexist in the same physical space, enabling both equipment operation and MR scanning simultaneously.
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 portable Faraday cage effectively reduces RF interference, enabling the use of essential accessory equipment during MRI scans without degrading image quality, thus improving the quality of MR images and allowing for safe use of non-MR compatible equipment.
Implementation Method 1
A Faraday cage having an interior sized for receiving a patient's treatment or monitoring equipment
Implementation Method 2
waveguides to accommodate accessory equipment, such as infusion pumps, while blocking RF signals below the Larmor frequency
Data Source
AI summary
A Faraday cage assembly for use with a Magnetic Resonance (MR) Imaging scanner is deployed inside the MR scanner room. The Faraday cage assembly is configured to accept accessory medical equipment which is desired to be attached to the patient during scanning. Accessory medical equipment can include patient monitoring systems, injector pumps, and intravenous (IV) poles with infusion pumps. Once the accessory medical equipment is placed inside the Faraday cage, radiofrequency (RF) interference emitted by the accessory medical equipment is contained within the cage and cannot significantly degrade MR image quality. The cage may permit non-MR compatible accessory equipment such as infusion pumps to be used without modification or reconfiguration during MR scanning.