| 摘要 |
PROBLEM TO BE SOLVED: To provide a system for association with an MRI and detecting presence of ferrous material and discriminating far magnetic field disturbance.SOLUTION: The system 10 includes a ferromagnetic detector 12 configured to monitor the magnetic field and includes an array of sensors 52 arranged about the periphery of an opening in a spaced manner such that each of the sensors is associated with a different portion of the opening. Each of the sensors is configured to output a signal having a value indicative of the sensed magnetic field at the associated portion of the opening. The system 10 includes a corrector configured to correct each signal value from the change in response to the far magnetic field disturbance and to provide respective corrected signal values. The system includes a processor configured to use the corrected signal values to determine whether a ferrous-indicating limit is exceeded and to output a safety response that addresses the ferrous-indicating limit exceed condition.SELECTED DRAWING: Figure 1 |
