Wireless Sensor Network for MRI Collision Avoidance
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Solution Overview
Problem
The integration of high-field MRI scanners in operating rooms poses safety hazards due to strong magnetic fields, which can cause ferromagnetic objects to become projectiles, and existing safety systems rely on manual checklists and large, fixed-position sensors that are not integrated with room control systems.
Innovation Solution
A wireless sensor network with distributed magnetic field sensors mounted on movable and stationary objects in the operating room, communicating with a central control system to monitor and adjust the position of MRI components and equipment to prevent collisions and ensure safety zones, using configurable alarm thresholds and object avoidance mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual checklists and large fixed-position sensors are used to monitor magnetic field safety, then safety monitoring is provided, but the system complexity increases and manual errors occur
Solution Approach 1:
The patent divides the safety monitoring system into multiple distributed wireless magnetic field sensors placed throughout the operating room. Each sensor independently monitors its local magnetic field strength and communicates with a central control system, replacing the single complex fixed-position sensor system. This segmentation reduces overall system complexity while maintaining comprehensive safety monitoring coverage.
Solution Approach 2:
The wireless sensors are designed to autonomously measure magnetic field strength, process the data locally, and transmit warnings independently without requiring manual intervention. The system automatically compares measured field strength against predetermined thresholds and triggers alerts, eliminating reliance on manual checklists and reducing human error while maintaining high reliability.
2Reliability
If distributed wireless sensors are deployed to monitor magnetic field strength, then manual errors are reduced and safety is enhanced, but device complexity increases
Solution Approach 1:
The wireless magnetic field sensors are designed as multi-functional devices that simultaneously perform magnetic field measurement, data processing, threshold comparison, and wireless communication. Each sensor unit serves multiple safety-related functions, reducing the need for separate systems and thereby managing complexity while enhancing safety protocol effectiveness.
Solution Approach 2:
The system implements continuous feedback loops where sensors monitor magnetic field strength in real-time, compare measurements against predetermined safety thresholds, and automatically trigger warnings or alerts when thresholds are exceeded. This automated feedback mechanism enhances safety protocol effectiveness by ensuring immediate response to hazardous conditions while reducing the complexity of manual monitoring procedures.
3Productivity
If the MRI scanner moves at high speed into the operating room, then workflow efficiency is improved, but the risk of ferromagnetic objects becoming projectiles increases
Solution Approach 1:
The system performs preliminary safety assessments by continuously monitoring magnetic field strength before the MRI scanner enters the operating room. Wireless sensors detect ferromagnetic objects in advance and trigger warnings, allowing staff to remove hazardous objects before the scanner moves at high speed. This preliminary action enables high-speed scanner movement while preventing projectile hazards.
Solution Approach 2:
The magnetic field monitoring system provides real-time feedback during scanner movement, continuously comparing measured field strength against safety thresholds. When ferromagnetic objects are detected or field strength exceeds safe levels, the system immediately triggers alerts, allowing operators to halt scanner movement. This feedback mechanism enables efficient high-speed operation while preventing projectile hazards through continuous monitoring and immediate response.
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
Enhances safety by automatically monitoring and managing the movement of MRI components and equipment, reducing the risk of collisions and improving workflow efficiency during intra-operative imaging, while minimizing manual error and enhancing safety protocols.
Implementation Method 1
a plurality of magnetic field sensors each mounted on a respective one of the plurality of additional components for measuring the magnetic field at the location of the component
Implementation Method 2
a magnetic resonance imaging apparatus including a magnet for generating a magnetic field of sufficient intensity to carry out a magnetic resonance imaging procedure on the patient
Implementation Method 3
The magnetic flux density can be up to 3 tesla or 30 000 gauss in a clinical setting
Implementation Method 4
the field of the magnet extends to an area outside of the magnet with sufficient intensity to cause movement of ferro-magnetic material within the area
Data Source
AI summary
In a MRI system housed within a room there is provided a movable magnet and additional components for other procedures on the patient, a control system is provided for the relative movement of the magnet and components. This includes a plurality of magnetic field sensors mounted on the components for measuring the magnetic field at the location of the component and an optional camera positioning system so that the control system can estimate relative positions of the components relative to the magnet from the sensed field strengths from the set of sensors to avoid collisions during the movements.