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Door assembly for an MRI room

  • US 10,191,176 B2
  • Filed: 11/13/2014
  • Issued: 01/29/2019
  • Est. Priority Date: 11/15/2013
  • Status: Active Grant
First Claim
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1. An MRI room door assembly for use in protecting an entrance to a room containing an MRI scanner system, the assembly comprising a doorframe that is suitable of being fixed in position within or around an opening to the room, a door that is fixed to the doorframe, and a sealing arrangement that seals the door to the frame when it is at rest in the closed position and which is released as a user initiates an opening of the door, in which at least one or more of the door and the doorframe include a built in safety system which provides a function relating to preventing ferromagnetic objects being brought unintentionally close to the MRI machine,in which the safety system comprises a ferromagnetic detection system (FMDS) arranged in use to warn a person approaching the door with a ferromagnetic object that they should not enter the room through the door with the ferromagnetic object;

  • in which the FMDS comprises;

    a primary sensor means comprising at least one passive magnetic sensor means which detects the disturbances in the ambient magnetic field which occur as the ferromagnetic object moves through the field;

    a secondary non-magnetic sensor means which detects movement of objects in the vicinity of the primary sensor means; and

    a processing circuit which is arranged to monitor the signals from the sensors and to provide an alarm in the event that both the primary and secondary sensor means detect a moving ferromagnetic object,in which the signal processing circuit is configured to identify temporal variations in the measurement signal due to the movement of a ferromagnetic object within the ambient magnetic field and to correlate the identified temporal variations in the measurement signal with instances in which the non-magnetic sensor means detects the presence of an object in its detection zone, and in which the signal processing circuit is arranged to cause the alarm to operate in the event that the correlation is indicative of the presence of a ferromagnetic object in the primary detection zone, andfurther in which the signal processing circuit is adapted to determine the direction from which the object is approaching the doorway from the output signals from the non-magnetic sensor means and to modify the operation of the alarm dependent on the direction of approach.

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