MRI in Practice Ch. 10
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What is the name of the effect that causes elevation of the T wave in cardiac gating?
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Magneto-hemodynamic effect
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What velocity does a paper clip have at 1.5 T?
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40 mph
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What is the FDA limit for SAR for the head in the USA?
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3 W/kg
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What effects do gradients have on patients using EPI? Show/Hide Answer
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Mild cutaneous sensations, involuntary muscle contractions, magneto-phosphenes
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What is the name of the most up-to-date MRI safety website?
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www.mrisafety.com
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What is the FDA limit for field strength for clinical imaging in adults?
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8.0 T
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All cardiac pacemakers are contraindicated
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True generally (although a MR conditional pacer was recently approved by the FDA).
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Long-term biological effects associated with exposure to MRI include:
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None
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Formal standards on MRI safety were published in:
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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.
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The accepted terms for defining devices in MRI include all of the following EXCEPT:
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*a)MR compatible b)MR safe c)MR unsafe d)MR conditional
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The biological effects associated with the time varied magnetic gradient field include all of the following EXCEPT:
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a)peripheral nerve stimulation b)acoustic noise *c)heating of tissues d)magneto-phosphenes
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All intracranial vascular clips are MR safe T/F
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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'.
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The ACR White Paper on MRI Safety recommends that every MRI facility:
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*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
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Siting considerations for MRI facilities include all of the following EXCEPT:
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a)structural reinforcement b)spatial dimensions c)mechanical and electrical capabilities *d)radio frequency
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Testing for implanted devices includes all of the following EXCEPT:
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a)torque and heating b)functionality of the device c)device interference with image quality *d)frequency of use
