MRSO: Exam 1
The control room is found where?
a. Zone I
b. Zone II
c. Zone III
d. Zone IV - ANS-C. Zone III
Which of the following describe when a non-ferrous object is repulsed by static
magnetic field?
a. Fourier transformation
b. Lenz's force
c. Ohm's law
d. Larmor equation - ANS-b. Lenz's force
Which of the following are recommended by the ACR Guidance document in MR safety
2013 in proper scanning of a patient?
I. Metal detector
II. Ferromagnetic detection system
III. Written screening sheet
IV. Patient gown
a. I, III, IV
b. I, II, III, IV
c. II, III, IV
d. III - ANS-c. II, III, IV
What is the FDA SAR limit for the whole body in first level controlled operating mode?
a. 8 W/kg for 15 mins
b. 4 W/kg for 15 mins
c. 3 W/kg for 10 mins
d. 7 W/kg for 20 mins - ANS-b. 4 W/kg for 15 mins
Gadolinium contains what kind of magnetism?
a. Diamagnetic
b. Paramagnetic
c. Ferromagnetic
, d. Super paramagnetic - ANS-b. Paramagnetic
Which of the following is true of Zone IV? Select all that apply.
a. This area should be monitored by a level 2 MR personnel
b. Should be noted with signage
c. Contain metal detectors for implant identification
d. No unsafe implants may cross the 5-gauss unless the implant is researched and
analyzed for risk - ANS-a, b, d
Where will peripheral nerve stimulation be the strongest?
a. Further away from isocenter in the gantry
b. At the level of the table when it is advanced
c. At isocenter
d. Outside the gantry near the 5 gauss line - ANS-a. Further away from the isocenter in
the gantry
A patient is advanced in the MRI scanner very quickly and experiences a sensation of
flashing lights in their visual field. What are they experiencing?
a. Nystagmus
b. Heating
c. Magnetophosphenes
d. Magnetohydrodynamic effect - ANS-c. Magnetophosphenes
What is the name for the direction of the vector of the static magnetic field?
a. Inverse field
b. Equilibrium
c. B0
d. B1 - ANS-c. B0
An object that produces a weakly repulsive force in the presence of a strong magnetic
field is called what?
a. Superparamagnetic
b. Ferromagnetic
c. Diamagnetic
d. Paramagnetic - ANS-c. Diamagnetic
What are the risks associated with translational force?
a. Missile effect
b. Proximity heating
The control room is found where?
a. Zone I
b. Zone II
c. Zone III
d. Zone IV - ANS-C. Zone III
Which of the following describe when a non-ferrous object is repulsed by static
magnetic field?
a. Fourier transformation
b. Lenz's force
c. Ohm's law
d. Larmor equation - ANS-b. Lenz's force
Which of the following are recommended by the ACR Guidance document in MR safety
2013 in proper scanning of a patient?
I. Metal detector
II. Ferromagnetic detection system
III. Written screening sheet
IV. Patient gown
a. I, III, IV
b. I, II, III, IV
c. II, III, IV
d. III - ANS-c. II, III, IV
What is the FDA SAR limit for the whole body in first level controlled operating mode?
a. 8 W/kg for 15 mins
b. 4 W/kg for 15 mins
c. 3 W/kg for 10 mins
d. 7 W/kg for 20 mins - ANS-b. 4 W/kg for 15 mins
Gadolinium contains what kind of magnetism?
a. Diamagnetic
b. Paramagnetic
c. Ferromagnetic
, d. Super paramagnetic - ANS-b. Paramagnetic
Which of the following is true of Zone IV? Select all that apply.
a. This area should be monitored by a level 2 MR personnel
b. Should be noted with signage
c. Contain metal detectors for implant identification
d. No unsafe implants may cross the 5-gauss unless the implant is researched and
analyzed for risk - ANS-a, b, d
Where will peripheral nerve stimulation be the strongest?
a. Further away from isocenter in the gantry
b. At the level of the table when it is advanced
c. At isocenter
d. Outside the gantry near the 5 gauss line - ANS-a. Further away from the isocenter in
the gantry
A patient is advanced in the MRI scanner very quickly and experiences a sensation of
flashing lights in their visual field. What are they experiencing?
a. Nystagmus
b. Heating
c. Magnetophosphenes
d. Magnetohydrodynamic effect - ANS-c. Magnetophosphenes
What is the name for the direction of the vector of the static magnetic field?
a. Inverse field
b. Equilibrium
c. B0
d. B1 - ANS-c. B0
An object that produces a weakly repulsive force in the presence of a strong magnetic
field is called what?
a. Superparamagnetic
b. Ferromagnetic
c. Diamagnetic
d. Paramagnetic - ANS-c. Diamagnetic
What are the risks associated with translational force?
a. Missile effect
b. Proximity heating
