MRSO: Exam 4 2024 with Questions & 100% Correct Answers
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Course
MRSO
Institution
MRSO
An MR conditional implant should minimally address which of the following? Select all
that apply.
a. Switched gradient magnetic fields
b. Patient position
c. Radiofrequency fields
d. Static magnetic field - Answer a, c, d
Where would we expect to see hotspots?
a. Areas in the near field
b. ...
MRSO: Exam 4 2024 with Questions & 100%
Correct Answers
An MR conditional implant should minimally address which of the following? Select all
that apply.
a. Switched gradient magnetic fields
b. Patient position
c. Radiofrequency fields
d. Static magnetic field - Answer a, c, d
Where would we expect to see hotspots?
a. Areas in the near field
b. Areas with low dielectric constants
c. Areas under the transmit RF coil
d. All the choices are correct - Answer d. All the choices are correct
There is a large number of literature that suggests that patients in sickle cell crisis who
receive gad contrast can develop many complications, even death.
a. True
b. False - Answer b. False
Which of the following slew rates would produce the greatest chance for peripheral
nerve stimulation?
a. 180 T/m/s
b. 200 T/m/s
c. 100 T/m/s
d. 125 T/m/s - Answer b. 200 T/m/s
,The ICNIRP sets and occupational dose of _______ to the head and torso.
a. Spatial peak magnetic flux density of 6T
b. Spatial peak magnetic flux density of 4T
c. Spatial peak magnetic flux density of 2T
d. Spatial peak magnetic flux density of 1T - Answer c. Spatial peak magnetic flux density
of 2T
A patient is having MR pelvis exam. Where would we expect the patient to experience
peripheral nerve stimulation?
a. Head
b. Legs
c. Groin
d. Feet - Answer b. Legs
The amount of patient heating depends on which of the following?
a. Surface area
b. Receiver coil
c. Patient mass
d. Controlled operation - Answer a, b, c, d
Which of the following will demonstrate translational force? Select all that apply.
a. A titanium hip replacement
b. A steel aneurysm clip
c. A cobalt heart stent
d. Gad contrast - Answer b. A steel aneurysm clip
, Cobalt, titanium and gad are non-ferrous. They will not demonstrate translational force.
Steel is and will translate and rotate in the presence of a static magnetic field.
Which of the following are bioeffects associated with the time-varying gradient
magnetic field? Select all that apply.
a. Peripheral nerve stimulation
b. Heating
c. Magnetohydrodynamic effect
d. Magnetophosphenes - Answer a, d
There's been no evidence of heating associated with the time-varying gradient fields.
Magnetophosphenes and peripheral nerve stimulation have to do with a fast changing
magnetic field. We find this with the time-varying gradient field. Magnetohydrodynamic
effect has to do with the static magnetic field and flow potential.
Which of the following is true of a 3T MRI? Select all that apply.
a. It will produce more stimulation at isocenter than other field strengths.
b. Will have a larger maximum spatial gradient than a 1.0 T unit
c. It will have a higher whole body SAR limit in normal mode than the normal mode at a
1.5 T
d. Have more chance for peripheral nerve stimulation than at 1.5T - Answer b. Will have
larger maximum spatial gradient than a 1.0 T unit.
Passive metallic implants <2cm are not expected to heat up during image acquisition.
a. True
b. False - Answer a. True
The strength of the gradient field will reach a maximum strength of what?
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