Compact RF Feedthrough Filter for MRI Multi-Zone LED Lighting
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Solution Overview
Problem
MRI scan rooms face challenges with electromagnetic interference (EMI) from LED lighting systems, which can degrade image quality and require costly and inflexible RF filtering solutions, especially when trying to implement multi-zone lighting configurations.
Innovation Solution
A multi-zone power supply (MZPS) system utilizing Power over Ethernet (POE) technology with electrically isolated filters and linear LED drive to minimize EMI, allowing for remote placement of filters and flexible lighting zone configurations without the need for multiple RF filters within the MRI room.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple RF filters are installed in the MRI scan room for multi-zone lighting, then EMI protection is improved, but system size and cost increase
Solution Approach 1:
The power supply unit is extracted from the MRI scan room and placed outside, eliminating the need for multiple RF filters within the scan room. The external power supply connects to multiple LED drivers through isolated power lines, providing EMI protection at the source rather than requiring multiple filters at each lighting zone.
Solution Approach 2:
Electrically isolated power lines serve as intermediaries between the external power supply and LED drivers inside the MRI scan room. These isolated lines transfer power without conducting EMI into the scan room, replacing the need for multiple RF filters while maintaining multi-zone lighting capability.
2Object-affected harmful factors
If multiple RF filters are installed in the MRI scan room for multi-zone lighting, then EMI protection is improved, but system cost increases
Solution Approach 1:
The power supply unit is extracted from the MRI scan room and placed outside, eliminating the need for multiple RF filters within the scan room. The external power supply connects to multiple LED drivers through isolated power lines, providing EMI protection at the source rather than requiring multiple filters at each lighting zone.
Solution Approach 2:
Multiple lighting zones share a single external power supply unit, consolidating the EMI protection function into one location. This merging approach reduces the total number of RF filters needed from multiple (one per zone) to just one or none, depending on the specific implementation.
3Ease of manufacture
If a single large RF filter is used to save money, then system cost is reduced, but flexibility and adaptability are worsened
Solution Approach 1:
The power distribution system is segmented into multiple electrically isolated power lines, each serving specific LED drivers or lighting zones. This segmentation allows independent control and configuration of different lighting zones while sharing a common external power supply, providing both cost savings and flexibility.
Solution Approach 2:
The system allows dynamic configuration of lighting zones by connecting LED drivers to different combinations of isolated power lines. This enables flexible reconfiguration of lighting zones without requiring physical repositioning of RF filters or major system changes.
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 MZPS effectively reduces EMI, enabling high-quality imaging by isolating and filtering electromagnetic noise, reducing system size and cost, and allowing for customizable multi-zone lighting without the drawbacks of traditional RF filtering approaches.
Implementation Method 1
the filter is on the RF shielded room wall
Implementation Method 2
filtering EMI for configurable lighting systems in an MRI room
Implementation Method 3
The power cables to the lumenaires utilize Power over Ethernet ('POE') technology, which is a technology that lets network cables of certain categories carry electrical power
Implementation Method 4
The present invention also relates general to electrical systems and methods that include light emitting diode ('LED') light sources
Implementation Method 5
the LED typically comprises a two-lead semiconductor light source
Data Source
AI summary
A filter with five or more electrically isolated inputs filtering EMI is provided for configurable lighting systems in an MRI room. The LED driver can be remote or on board the luminaire. Fixtures with no on-board electronics and Cat5 wiring are also possible given the MZPS characteristics. The embodiment of the filter includes independent, electrically isolated, low voltage, and low current feedthroughs. While the filter housing can take any form, the preferred embodiment is DB (or D-subminiature which contains two or more rows of pins or sockets surrounded by a D-shaped metal shield that, among other things, screens against EMI). Individual feedthrough filters may be paralleled to increase total current required for increase load demand for MRI lighting systems. Further, the use of electrically isolated AC/DC or DC/DC drive electronics, enable the use of a low cost multi-input filter which supplies an MRI scan room with power to drive luminaires.