Exam (elaborations)
MRSO PREP TEST QUESTIONS AND ANSWERS 2024
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Exam of 27 pages for the course MRSO at MRSO (MRSO PREP TEST)
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MRSO PREP TESTIdentify the processional speed of hydrogen at a specific field strength – answer Larmar
equation
What does A/M equal - answer magnetic field strength
Created chance for induced current in our patient would be found at - answer peripheral
to isocenter
According to ACR manual what is the 1/2 wavelength at 7T which place a patient at risk
for resonant burns - answer5-7 cm
What does "rms" mean in B1+rms - answer do rounded value of energy producing RF
What does "+" mean in B1 + rms - answer energy yielding portion of our RF field
patient tissue is dielectric and will not carry a current efficiently causing heating in tissue
– answer ohmic heating
1.5T/3T units have a max gradient peak of - answer30-45 m+/m
Type of heating that is produced in tissues near RF transmitter - answer dipole
A way to get records on someone named in a case - answer discovery
Burns caused when a coil touches a patient - answer electrical conductivity
Allowable max strength a gradient coils ________ is measured in __________ - answer
max gradient peak mT/m
_________ force is responsible for noise - answer Lorentz
What is period of time B1+rms energy delivered to our patient over - answer10 seconds
Mathematical equation used to convert k space into an image - answer Fourier equation
when the distance between a patient and wall of gantry are insufficient a burn can result
- answer dipole dipole effect
A wire half the wavelength of _______________ has greatest heating - answer transmit
frequency
,Which would we assume would have the largest artifact 316<SS clip, cobalt clip,
titanium clip - answer cobalt clip
Offers the role of MR safety consultant – answer MRSE
In a gradient profile what describes period of time where gradients are not changing -
answer duty cycle
Changing gradient magnetic field RF - answer time varying magnetic field
Limit of static magnetic field in 1st level operating mode - answer8T
Vasodilation will produce __________ in contrast - answer tingling
Austenitic is __________ stainless steel - answer on ferrous
What will increase induced current in our patient - answer fast gradient activation and
stronger magnetic fields
type of heating where _________currents are produced in the patient - answer eddy
currents
When large doses of gad are delivered to a patient over a span of their life __________
occurs - answer retained gad or gad deposition
The higher the relativity of contrast media ___________ signal can be detected -
answer more signal
The degree that a tissue demonstrates T1 and T2 relaxation post contrast refers to
_________ - answer relativity
An object that retains a magnetic field as it is removed from a strong magnetic field -
answer ferromagnetic
1T=_____ G - answer10,000 G
Who issued the ACR manual on MRI safety in 2020 – answer ACR
Decrease in bandwidth can be used to _______ echo spacing - answer increase
If cryogen is released into MR room the patient can experience - answer poor visibility,
rain and snow
When flip angle is doubled heating will - answer quadruple
, Involuntary movement of eyes side to side - answernystagmus
_____ ionic gad agents demonstrate highest risk of NSF in patients with renal failure -
answerlinear non ionic
the purpose of the ________ is to align hydrogen parallel and anti parallel to B0 -
answerstatic magnetic field
normal kidneys excrete contrast in _____ hours - answer24
ice packs and ___________ act as heat sinks - answerflowing blood
When gad breaks free from the ligand and remains in the body - answerNSF
Nuclei affected by __________ magnetic fields will demonstrate faster precession and
nuclei - answerstronger
Larger patients produce ____ heating due to their ______ - answerlarger, mass
Wires _______ in diameter________ in length or looped hold large risk to heating when
exposed to RF - answersmall, long
The detection of gad in drinking water - answerAnthropogenic
Transmission of radio frequency waves into a patient can cause ______ -
answerheating
_______________ has established guidelines for MR safety and best practices followed
in US - answerACR manual on MRI safety
Radiofrequency produced in MR unit - answerB1
B1+rms is measured in what - answerw/kg j/kg microtesla
When considering heating from RF field what is our main concern - answerincrease
patient's core temp
Electrical current induction is at risk when scanning a pelvis with brain stimulator when
considering _______________field - answertime varying gradient field
time varying gradient magnetic fields are measured in - answerdB/d+
What will determine how well a patient will regulate their core temp - answeramount of
surface area on p+
F P0:B will do what - answerlimit B1+rms plus slew rate
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