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MRSO PREP questions and answers rated A+ 2024/2025
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MRSO PREPIdentify the precessional speed of hydrogen at a specific field strength - ANSLarmar equation
What does A/M equal - ANSmagnetic field strength
Created chance for induced current in our patient would be found at - ANSperipheral to
isocenter
According to ACR manual what is the 1/2 wavelength at 7T which place a patient at risk for
resonant burns - ANS5-7 cm
What does "rms" mean in B1+rms - ANSdo rounded value of energy producing RF
What does "+" mean in B1 + rms - ANSenergy yielding portion of our RF field
patient tissue is dielectric and will not carry a current efficiently causing heating in tissue -
ANSohmic heating
1.5T/3T units have a max gradient peak of - ANS30-45 m+/m
Type of heating that is produced in tissues near RF transmitter - ANSdipole
A way to get records on someone named in a case - ANSdiscovery
Burns caused when a coil touches a patient - ANSelectrical conductivity
Allowable max strength a gradient coils ________ is measured in __________ - ANSmax
gradient peak mT/m
_________ force is responsible for noise - ANSlorentz
What is period of time B1+rms energy delivered to our patient over - ANS10 seconds
Mathematical equation used to convert k space into an image - ANSfourier equation
when the distance between a patient and wall of gantry are insufficient a burn can result -
ANSdipole dipole effect
A wire half the wavelength of _______________ has greatest heating - ANStransmit frequency
,Which would we assume would have the largest artifact 316<SS clip, cobalt clip, titanium clip -
ANScobalt clip
Offers the role of MR safety consultant - ANSMRSE
In a gradient profile what describes period of time where gradients are not changing - ANSduty
cycle
Changing gradient magnetic field RF - ANStime varying magnetic field
Limit of static magnetic field in 1st level operating mode - ANS8T
Vasodilation will produce __________ in contrast - ANStingling
Austentic is __________ stainless steel - ANSnon ferrous
What will increase induced current in our patient - ANSfast gradient activation and stronger
magnetic fields
type of heating where _________currents are produced in the patient - ANSeddy currents
When large doses of gad are delivered to a patient over a span of their life __________ occurs -
ANSretained gad or gad deposition
The higher the relaxivity of contrast media ___________ signal can be detected - ANSmore
signal
The degree that a tissue demonstrates T1 and T2 relaxation post contrast refers to _________ -
ANSrelaxivity
An object that retains a magnetic field as it is removed from a strong magnetic field -
ANSferromagnetic
1T=_____ G - ANS10,000 G
Who issued the ACR manual on MRI safety in 2020 - ANSACR
Decrease in bandwidth can be used to _______ echo spacing - ANSincrease
If cryogen is released into MR room the patient can experience - ANSpoor visibility, rain and
snow
When flip angle is doubled heating will - ANSquadruple
, Involuntary movement of eyes side to side - ANSnystagmus
_____ ionic gad agents demonstrate highest risk of NSF in patients with renal failure -
ANSlinear non ionic
the purpose of the ________ is to align hydrogen parallel and anti parallel to B0 - ANSstatic
magnetic field
normal kidneys excrete contrast in _____ hours - ANS24
ice packs and ___________ act as heat sinks - ANSflowing blood
When gad breaks free from the ligand and remains in the body - ANSNSF
Nuclei affected by __________ magnetic fields will demonstrate faster precession and nuclei -
ANSstronger
Larger patients produce ____ heating due to their ______ - ANSlarger, mass
Wires _______ in diameter________ in length or looped hold large risk to heating when
exposed to RF - ANSsmall, long
The detection of gad in drinking water - ANSAnthropogenic
Transmission of radio frequency waves into a patient can cause ______ - ANSheating
_______________ has established guidelines for MR safety and best practices followed in US -
ANSACR manual on MRI safety
Radiofrequency produced in MR unit - ANSB1
B1+rms is measured in what - ANSw/kg j/kg microtesla
When considering heating from RF field what is our main concern - ANSincrease patient's core
temp
Electrical current induction is at risk when scanning a pelvis with brain stimulator when
considering _______________field - ANStime varying gradient field
time varying gradient magnetic fields are measured in - ANSdB/d+
What will determine how well a patient will regulate their core temp - ANSamount of surface
area on p+
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