MRI Safety Flashcards
Who has published a guidance document on MRI safety?
ACR
What zone is for the general public?
Zone I
What zone is for unscreened MRI patients?
Zone II
What zone is for screened MRI patients and personnel having access to magnet room?
Zone III
What zone is for screened MRI patients under direct supervision of MRI personnel?
Zone IV
What zone states that “all areas that are freely accessible to the general public. This area is typically outside of MR environment itself and is the area through which patients, healthcare personnel, and other employees of the MR site access the MR environment?”
Zone I
What zone states that “the interface between the publicly accessible, uncontrolled Zone I and the strictly controlled Zones III and IV. Typically, patients are greeted in this zone and are not free to move throughout at will, but are rather under the supervision of MR personnel. It is in this zone that the answers to MR screening questions, patient histories, medical insurance questions, etc are typically obtained?”
Zone II
What zone states that this is “the region in which free access by unscreened non MR personnel or ferromagnetic objects or equipment can result in serious injury or death as a result of interactions between the individuals or equipment and the MR scanner’s particular environment. These interactions include, but are not limited to those involving the MR scanner’s static and TVMF. This zone should be physically restricted from general public access?”
Zone III
What zone states that this is “the physical confines of the room within which the MR scanner is located. This zone should also be demarcated and clearly marked as being potentially hazardous due to the presence of very strong magnetic fields. This zone should be clearly marked with a red light and lighted sign stating THE MAGNET IS ON. Except for resistive systems, this light and sign should be illuminated at all times and should be provided with a backup energy source to continue to remain illuminated for at least 24 hours in the event of a loss power to the site?”
Zone IV
What personnel include patients, visitors, or facility staff who have not undergone formal safety training (within the last 12 months) as designated by the MRI safety director?
Non MRI personnel
What personnel include office staff and patient aides who have passed minimal safety education to ensure their own safety as they work within Zone III?
Level 1 personnel
What personnel include MRI techs, radiologists, nursing staff who have been extensively trained in MRI safety including issues relating to thermal loading, burns, and neuromuscular excitation from rapidly changing gradients?
Level 2 personnel
A way of measuring the USA FDA limit for RF exposure?
SAR - Specific Absorption Rate
“An item that poses no known hazards in all MR imaging environments. Items are nonconducting, nonmetallic, and nonmagnetic items such as a plastic Petri dish.”
MR Safe
“An item that has been demonstrated to pose no known hazards in a specified MR environment with specified conditions of use.”
MR Conditional
