MRSO: Exam mark Questions & Correct Revised Verified Answers
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Course
MRSO
Institution
MRSO
NSF is caused by what?
a. When the patient is allergic to gad contrast
b. When gad ion is excreted by the liver
c. When gad ion is excreted from the body quickly
d. When a gad ion breaks free from the ligand and remains in the body - Answer d.
When a gad ion breaks free from the ligand and rem...
MRSO: Exam mark Questions & Correct
Revised Verified Answers
NSF is caused by what?
a. When the patient is allergic to gad contrast
b. When gad ion is excreted by the liver
c. When gad ion is excreted from the body quickly
d. When a gad ion breaks free from the ligand and remains in the body - Answer d.
When a gad ion breaks free from the ligand and remains in the body
What pulse sequence will produce the most patient heating?
a. Gradient echo
b. Conventional spin echo
c. Inverse recovery sequence
d. Single shot fast spin echo - Answer d. Single shot fast spin echo
The allowable maximum strength of the gradient coils is called?
a. Spacial gradient
b. Rise time
c. Slew rate
d. Maximum gradient peak - Answer d. Maximum gradient peak
Using a headset and earplugs will reduce noise by how much?
a. 50 dB
b. By the NRR of the headset + NRR of earplugs
,c. By the NRR of the headset
d. By the NRR of the headset + NRR of earplugs divided by 2 - Answer b. By the NRR of
the headset + NRR of earplugs
Time-varying gradient magnetic fields are measured in which of the following?
a. W/kg
b. Tesla
c. dB/dt
d. dB/dx - Answer c. dB/dt
"d"=change in
"B"=static field strength
"t"=time
Therefore this means that a change in static field strength over a change in time.
Gad contrast will affect tissue when...?
a. It touches tissues
b. None of the choices
c. It is in very close proximity to tissue
d. It doesn't touch tissue - Answer c. It is in very close proximity to tissue
The FDA limits SAR in the head to what?
a. 3.2 W/kg for 10 min
b. 8 W/kg for 20 min
c. 10 W/kg for 15 min
d. 4 W/kg for 15 min - Answer a. 3.2 W/kg for 10 min
,The gradient coils are used for what in MRI?
a. Tilting nuclei in to the transverse plane
b. Spacial encoding
c. Resonance production
d. Aligning nuclei to a vector - Answer b. Spatial encoding
Passive shield is performed how?
a. A magnetically conductive material surrounds the MR unit and this shapes and
contains the magnetic field
b. Bricks permanent magnets are stacked around the MR unit to contain the fringe field
c. Nothing is used with passive shielding
d. A coil of wire in the MR unit has a current running through it which produces a
magnetic field opposing the B0 - Answer a. A magnetically conductive material
surrounds the MR unit and this shapes and contains the magnetic field
The speed that the gradient coils can turn on and off is called what?
a. Maximum gradient peak
b. Rise time
c. Spatial gradient
d. Slew rate - Answer d. Slew rate
The speed that it takes a gradient coil to reach a maximum strength is called what?
a. Maximum gradient peak
b. Rise time
c. Spatial gradient
d. Slew rate - Answer b. Rise time
, A patient undergoing an MRI exam is given an icepack to reduce heat. Which of these
methods is the patient using to regulate their increased heating?
a. Convection
b. Conduction
c. Radiation
d. Evaporation - Answer b. Conduction
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
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