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MRSO: Exam mark Questions & Correct Revised Verified Answers
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MRSO: Exam mark Questions &Correct Revised Verified Answers
What is the purpose of the static magnetic field?
a. To align hydrogen nuclei parallel and anti-parallel to B0
b. To reverse the spin of the hydrogen nuclei
c. To produce currents in tissues containing hydrogen nuclei
d. To measure the movement of hydrogen nuclei - Answer a. To align hydrogen nuclei
parallel and anti-parallel to B0
Induction of electrical current in our patient from changing magnetic fields can
be described by which of the following?
a. Ohm's law
b. Fourier equation
c. Faraday's law of induction
d. Larmor equation - Answer c. Faraday's law of induction
The IEC 60601-2-33 normal operating mode is __________ the energy requirements
limited in the first level controlled operating mode.
a. Half
b. Triple
,c. Double
d. Not comparable to - Answer a. Half
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 - Answer b. Lenz's force
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 - Answer b. 4 W/kg for 15 mins
Gadolinium contains what kind of magnetism?
a. Diamagnetic
b. Paramagnetic
c. Ferromagnetic
d. Super paramagnetic - Answer b. Paramagnetic
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 - Answer a. Further away from the
isocenter in the gantry
What is the name for the direction of the vector of the static magnetic
field? a. Inverse field
b. Equilibrium
c. B0
d. B1 - Answer 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 - Answer c. Diamagnetic
The gradient coils are responsible for which of the following? Select all that apply.
a. Heating
b. Rotational force
c. Translational force
d. Magnetohydrodynamic effect
e. Noise
f. Peripheral nerve stimulation - Answer e. Noise
f. Peripheral nerve stimulation
, Why is magnetic shielding used in an MR unit?
a. To reduce heating
b. To reduce the e-fields
c. To maintain field homogeneity
d. To limit the fringe field - Answer d. To limit the fringe field
Contrast media will do what to our tissue?
a. Shorten T1 relaxation times
b. Shorten T1 & T2 relaxation times
c. Increase T2 relaxation times and decrease T1 relaxation times
d. Shorten T2 relaxation times - Answer b. Shorten T1 & T2 relaxation times
As blood flows through a vessel, currents can be induced. The degree of this is called?
a. Magnetophosphenes
b. Flow potential
c. Translational forces
d. Fringe field - Answer b. Flow potential
The T-wave in the cardiac cycle represents what?
a. Heart repolarization
b. Heart depolarization
c. None of the choices
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