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MRI Forum: door alarm/ MRI pauses if doo ...
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  Category:  Devices, Scanner, Machines
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Samuel Strode

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Thu. 7 Aug.14,
22:17
door alarm/ MRI pauses if door opens
Hello all. I am a engineering student that is studying everything that I can. I came across something that said MRI's are enclosed in a room (duh) but when the scan is going the door is "armed" so if it is opened the scan pauses. Is this true for all MRI's? I work in a small imaging center and when I asked the tech there he gave me a funny look and said go back to work. Can you help? Can you tell me which MRI system that you are using and whether or not it when the door opens the scan will pause or stop. If the scan stops is the series lost? is everything? or can you pick up where you left off. Thank you for your assistance. If you have any other information about MRI's pausing during scans, stopping, saving image quality, and you are willing to share please feel free to share.
 
 

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Rena Miller

Fri. 15 Aug.14,
07:16
MRIs are enclosed by a Faraday cage to shield the MRI scanner against incoming radio waves which would disturb the sent and received signals. The reception or transmission of radio waves is heavily attenuated or blocked by the cage, which is usually integrated in the walls of the scanning room. The closed RF door completes the cage preventing RFI/EMI leakage, absorbs also much of the acoustic noise and prevents unauthorized persons to enter the room. Usually, all or the unreconstructed part of information is lost if the scan is stopped by door opening. Some MRI systems allow to pause the scan (at the keyboard, not by door opening) and to continue scanning while not loosing data.

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