MRI in Practice Ch. 10

Unlock all answers in this set

Unlock answers
question
What is the name of the effect that causes elevation of the T wave in cardiac gating?
answer
Magneto-hemodynamic effect
question
What velocity does a paper clip have at 1.5 T?
answer
40 mph
question
What is the FDA limit for SAR for the head in the USA?
answer
3 W/kg
question
What effects do gradients have on patients using EPI? Show/Hide Answer
answer
Mild cutaneous sensations, involuntary muscle contractions, magneto-phosphenes
question
What is the name of the most up-to-date MRI safety website?
answer
www.mrisafety.com
question
What is the FDA limit for field strength for clinical imaging in adults?
answer
8.0 T
question
All cardiac pacemakers are contraindicated
answer
True generally (although a MR conditional pacer was recently approved by the FDA).
question
Long-term biological effects associated with exposure to MRI include:
answer
None
question
Formal standards on MRI safety were published in:
answer
have never been written (d). Although there are no 'formal' standards for MRI safety, the ACR White Paper offers guidelines for safe and effective operation of the MR imaging facility.
question
The accepted terms for defining devices in MRI include all of the following EXCEPT:
answer
*a)MR compatible b)MR safe c)MR unsafe d)MR conditional
question
The biological effects associated with the time varied magnetic gradient field include all of the following EXCEPT:
answer
a)peripheral nerve stimulation b)acoustic noise *c)heating of tissues d)magneto-phosphenes
question
All intracranial vascular clips are MR safe T/F
answer
False. Many intracranial vascular clips are considered to be 'MR conditional'. IMRSER recommend that MR imaging in patients with intracranial clips is unsafe unless the clip is 'known to be safe'.
question
The ACR White Paper on MRI Safety recommends that every MRI facility:
answer
*a)establish, implement, and maintain current MR safety policies and procedures b)follow the procedures of ACR c)follow the procedures of mrisafety.com d)follow the ISMRM procedures
question
Siting considerations for MRI facilities include all of the following EXCEPT:
answer
a)structural reinforcement b)spatial dimensions c)mechanical and electrical capabilities *d)radio frequency
question
Testing for implanted devices includes all of the following EXCEPT:
answer
a)torque and heating b)functionality of the device c)device interference with image quality *d)frequency of use
Get an explanation on any task
Get unstuck with the help of our AI assistant in seconds
New