Exam (elaborations)
MRSO - Emergent Situations and Patient Considerations - Module 8 Questions and Answers
- Course
- Institution
MRSO - Emergent Situations and Patient Considerations - Module 8
[Show more]
Content preview
MRSO - Emergent Situations and PatientConsiderations - Module 8
Quench - answer-to extinguish
-means the magnetic field is removed
Liquid helium - answer-helium is not stable as a liquid. in order to maintain a liquid state,
it must stay at 4K (-452.4F)
-in order to maintain the temperature, must be vacuum sealed. if vacuum is removed,
temperature within the cryostat would rise
-helium will boil at 4.2K (-452.11F)
-liquid helium boils/expands at ratio of 1:750 to become helium gas
-gas escapes through quench pipes and ductwork to outside the facility
In event of manual quench: - answer-Remove all personnel from zone IV
-Complete removal of field may take several minutes. no ferrous items into room until
level 2 personnel determine field has been removed
-review quench policies and procedures with mr personnel annually
In event of a spontaneous quench: - answer-all persons immediately evacuated from
zone IV, preferably to zone II
-MR personnel secure the area until determined the field is no longer present
Some scan rooms have - answer secondary passive ventilation system (in the event the
primary system were to fail)
If primary ventilation system fails - answer-all of the gas will escape into the scan room
-asphyxiation would be possible
Asphyxiation - answer Helium gas is not toxic but will displace oxygen in scan room if
primary ventilation system fails and there is no secondary system.
Pressure inside room would increase quickly and significantly.
If primary ventilation system fails and scanner door swings inward, a ______________
can prevent the door from being opened. - answer pressure lock
A pressure lock is created against an inward swinging door due to: - answer1L liquid
helium expands to 750L helium gas
System contains up to 1000L liquid helium
, Pressure = force / area
If site doesn't have a secondary ventilation system, it is advisable to have - answera
means to break the scan room window
Quench Pipes / Ductwork - answer-warning signs should be prominently posted
-restrictive fencing should be employed
-should not be in publicly accessible area
-should point downward and have covering to prevent animals from entering
-should be inspected annually to be sure they are structurally intact and free of
obstruction
Regarding fires in Zone III and Zone IV: - answer-develop site-appropriate procedures
for handling fire
-remove electrical power to the equipment (emergency power off) All level 2 MR
personnel should know the location and difference between emergency power off button
and quench button
-For fire in Zone III, secure Zone IV
-Hold fire drills annually
MRI Security and access controls - answerare not suspended in event of a fire. MR
Level 2 Personnel are in control of who and what goes into MRI area.
ACR recommends fire safety training for - answerfirst responders : fire and police
personnel / in-house security
Emergency Power Off (EPO) - answer-removes electrical power to all components in
zone III and zone IV
-may be located on the wall or user console / keyboard
Magnet Quench Button - answer-releases the helium
-ensure it cannot be easily activated (cover over button)
-outside or inside zone IV
Fire hazard of helium gas - answerHelium boils at 4.2K, air liquifies at about 82K
Helium rushing through quench pipes is cold enough to liquify oxygen (atmosphere). If
that liquid drips onto active fire, it is extremely flammable.
Therefore, quench should not be performed in the event of a fire unless firefighters
insist on entering Zone IV
Fire extinguishers located in zone III or IV - answer-should be nonferrous
-should be able to be used on any type of fire (including electrical)
-should be tested and appropriately labeled
Anything on wheels in zone III presents a risk it will be brought into Zone IV. To prevent
items from entering zone IV, you can _____ the items. - answertether
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Dreamer252. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
82871 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now