Nursing calls are not usually installed in MRI rooms because the patients are under constant supervision by the healthcare staff. Why do you ask?
FGI Guidelines actually requires nurse call for MRI/Class 1 imaging room(s), both a staff assistance station and an emergency call system. This is also the minimum requirement in my state, California, which was based on the 2010 FGI.
During my tenor, our office has allowed the emergency call station to be installed outside the RF shielding in the control room that has the visual supervision of the patient to meet the intent of the FGI guidelines. No-one other than the patient is normally in the MRI imaging room when the scan is in process to initiate an emergency call. VA hospital design guidelines state: https://www.cfm.va.gov/til/dGuide/dgMRI.pdf : "Nurse call and/or intercom systems may be provided for communications between the control room and the scanning room". This would take the designer specification of compatible devices.
There was no mandatory requirement inside the enclosed RF shield for the MRI in the VA design guidelines. I trust the VA design meet the intent of the FGI guidelines. They were a major stakeholder is developing the FGI guidelines.
Here are typical designer specifications for nursing call stations: http://www2.mdanderson.org/depts/cpm/standards/odg_archives/odg_r08/D5034-M.pdf
I am sure you will respond to this. Please copy to words of the section of the 2010 FGI are you referencing to make me a believer.
"During my tenor, our office has allowed the emergency call station to be installed outside the RF shielding in the control room that has the visual supervision of the patient to meet the intent of the FGI guidelines. No-one other than the patient is normally in the MRI imaging room when the scan is in process to initiate an emergency call."
In agreement with you here Milt. I didn't what your response to be misunderstood or mis-taken as the service not requiring nurse call in its' entirety. The stations provided are initiated by staff and are typically in the control room outside of the MRI scanner room itself. Graphic is a snippet from the 2010 edition, subsequent editions 2014 & 2018 require the same.
I am a believer now. Thanks for the clarification.
I have a project outlining the n/c system in that dept. but could not find whether I needed to be a certain distance or use any type of additional shielding. I know there are no UL requirements but didn't see anything in NEC either.
The purpose of magnetic shielding is contain some amount of magnetic field generated by the MRI, so as not to interfere with surrounding areas. Each site is different as the layout and type of magnet varies. If your equipment is within this magnetic is could be effected. The most common goal for each MRI site is to contain the 5-gauss field to controlled areas. Magnetic shielding is usually fabricated with silicon steel in sheet form, but it can also be done in steel plate. It is different from the RF shielding you noramally see in the installations.
The NFPA codes will not be much help here.
I would contact the MRI tech people and get recommendations of your installation. Each installation is different.
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