Chapter 10 - MRI Safety Flashcards
(41 cards)
What is SAR stand for and what is it?
Specific absorption rate
this is a way of measuring the USA food and drug administration limit for RF ( Rutherfordium chemcial) exposure.
How many safety zones are there in MRI?
4
If a patient is in the room with the magnet, this is considered what safety zone?
4
What does safety zone #1 entail?
all areas that are freely available to the public ( AKA the hallway outside of MRI at the hospital)
If a patient is answering their screening questions, they are likely in which safety zone?
2. This is where people are greeted and asked to do their screening.
If an MRI tech is not with a patient and is just hanging out, she is likely in which safety zone?
3.
If a patient is currently getting their scan done and are under the magnet, which safety zone is this?
4.
Safety zone #4 should be marked as dangerous with a RED light and lighting sign.
True
True, this is the area in which the magnetic on and the patient is in the scanner.
What is the difference between level 1 and level 2 MRI people?
Level 1- is like the front desk/office people ( like Ashely or Margaret) who are trained in the basic safety but not an actual MRI tech. They are even allowed in the safety zone #3 :O
Level 2- is a MRI tech or MD trained in safety.
An item that poses no threat to MRI machines is considered a MR _______.
Safe, Conditional or, unsafe
MRI Safe
A green square with the words MR in it means that an item is “MRI SAFE”
True or False
True
What is an example of something that is considered MRI safe?
something plastic like a Petri Dish
What does a yellow sign with the words MR stand for?
MRI Conditional
What are the five major factors that are considered to have an impact on whether patients will have any side effects after having an MRI done?
- Psychiological
- The spatially varying static magnetic field
- electromagnetic fields
- Cryogens
- Time-varying gradient magnetic fields.
Some studies have shown that patients who have a brain scan sometimes have anxiety due to the close proximity and will require sedation of some sort.
true/ false
True
The narrow bore of an MRI machine rarely causes patient’s anxiety.
True/ False
False. The narrow bore of a MRI machine plays a significant role in patient claustrophobia and anxiety when having a test done.
At what stage of the exam are most patients the most scared/anxious?
the beginning.
What are several ways we can help put the patient at ease during exam?
- Aromatherapy
- Wider machines
- In-Scanner video presentations that include remainder of time of scan
- Painting the ceiling tiles.
- Sedation :)
What are the 4 main implications for patient safety in regards to the static field?
1) transient biological effects
2) projectile hazards
3) Torque on implanted devices
4) Foreign bodies in static field.
What is the main magnetic field called?
B
o
The magnetic field is 160, 000 times more powerful than that of the earth.
True
True
What are two temporary symptoms that are related to stepping into a magnetic field of 3-7?
Metallic taste in mouth and vertigo.
What are symptoms that patients experience in fields of 7T and above?
Nausea, dizziness, vertigo, postural instability,
What is thought to be the reasoning of why patients sometimes feel they are moving in a curved motion?
Caused by an overcompensation of the vestibular system ( in charge of balance) of the inner ear.
