Cryogens
Static Magnetic Field
RF
MRI Zones
ACR
100
The most common element used for cryogens in MRI.
What is Helium?
100
The most commonly used clinical magnet.
What is superconducting MRI unit?
100
Padding should be placed here.
What is between any skin-to-skin contact?
100
This zone is open for the general public.
What is zone I
100
What is MR conditional?
200
The loss of magnet superconductivity with sudden boil off of helium.
What is a quench?
200
The name of the little boy that was killed during an MRI because an MRI unsafe oxygen tank entered the room.
Who is Michael Colombini?
200
This kind of burn often comes from skin-to-skin contact.
What is a kissing burn?
200
Entrances to this zone should be identified with signage denoting it's space. It should state "Caution", "Restricted Access", "Screened MRI Patients and Personnel only."
What is zone III
200
The three formal MR safety roles and responsibilities for facility management of MR safety.
What is MRSO, MRSE, and MRMD?
300
This may appear suddenly around or above the MRI scanner during a failed quench.
What is fog or clouds?
300
These are flashing lights induced in the retina due to changing magnetic fields.
What is magnetophosphenes?
300
Account for 59% of all MRI-related injuries.
What is burns?
300
This is the zone that patients should be changed into a site-supplied gown and given a locker for their belongings.
What is Zone II
300
The three independent magnetic fields that create MRI safety challenges.
What are the Static Magnetic Field, the Time-Varying Radiofrequency Field, and the Time-Varying Gradient Magnetic Field?
400
This device expels dangerous gases.
What is a Quench Vent/Quench Pipe?
400
The layering of flux lines or magnetic fields of different strengths.
What is the Spatial Magnetic Gradient?
400
The amount of time it can take a burn to come to the surface of the skin after MRI.
What is 24 hours?
400
Shielding must be built into this zone to contain the fringe field.
What is zone IV
400
Screening by FMDS is recommended prior to entering this zone.
What is zone III and zone IV?
500
This condenses helium gas into a liquid and inserted into the top of the cryostat.
What is the Cold Head?
500
This law proves when conductive material moves through a magnetic field, an electrical current is produced in the material. When electrical current is produced, a magnetic field is produced 90* to this electrical current. This magnetic field that has been produced will now show opposition to the static magnetic field.
What is Lenz's Law?
500
This effect involves long conductive objects or wires that act like antennas that can emit power. At 1.5T 26cm and at 3T 13cm wires are most likely to create heating problems.
What is the Antenna Effect.
500
This zone is not routinely monitored by MR personnel. It is where potentially harmful gases escape during a quench.
What is the Cryogen Venting Zone?
500
This person is responsible for determining site-specific training that is necessary and appropriate for those individuals who will serve as level 1 and level 2 MR personnel.
Who is the MRMD?