MRI Physics Final Exam with Verified
Solutions
while non-ferrous metallic implants may show little or no deflection to the field, they could
cause ____ Correct Ans-significant heating due to their inability to dissipate the heat caused
by radio frequency absorption
with regards to TOF phenomena, an increase in slice thickness will yield: Correct Ans-signal
loss
with regard to entry slice phenomena, an increase in velocity of flow will yield a ______ in entry
slice phenomena Correct Ans-increase
you decrease NEX, you ____ scan time Correct Ans-decrease
the international electrotechnical comission (IEC) has defined the normal operating mode for
MRI scanner Correct Ans-pre-operating mode
_____ consist of multiple coils and receivers whose individual signals are combined to create
one Correct Ans-phased array coils
____ is the frequency difference between fat and water Correct Ans-chemical shift
, presaturation pulses are often used to: Correct Ans-Reduce flow artifacts
SAR is expressed in ____ Correct Ans-w/kg
which factor is most important when monitoring SAR? Correct Ans-patient weight
which of the following is not a method to eliminate phase wrap? Correct Ans-decreasing
NEX
A leak in the RF shielding can appear as a: Correct Ans-a "zipper" artifact in the frequency
direction
localized swelling or stagnant blood flow that has seperated from the central streamlines within a
vein Correct Ans-vortex flow
truncation artifact is seen as: Correct Ans-high and low signal intensity bands
what is predictable distribution of flow velocities in layers that parallel the vessel wall called:
Correct Ans-laminar flow
which of the following magnets typically requires the highest on going cost for the power
supply? Correct Ans-resistive
Solutions
while non-ferrous metallic implants may show little or no deflection to the field, they could
cause ____ Correct Ans-significant heating due to their inability to dissipate the heat caused
by radio frequency absorption
with regards to TOF phenomena, an increase in slice thickness will yield: Correct Ans-signal
loss
with regard to entry slice phenomena, an increase in velocity of flow will yield a ______ in entry
slice phenomena Correct Ans-increase
you decrease NEX, you ____ scan time Correct Ans-decrease
the international electrotechnical comission (IEC) has defined the normal operating mode for
MRI scanner Correct Ans-pre-operating mode
_____ consist of multiple coils and receivers whose individual signals are combined to create
one Correct Ans-phased array coils
____ is the frequency difference between fat and water Correct Ans-chemical shift
, presaturation pulses are often used to: Correct Ans-Reduce flow artifacts
SAR is expressed in ____ Correct Ans-w/kg
which factor is most important when monitoring SAR? Correct Ans-patient weight
which of the following is not a method to eliminate phase wrap? Correct Ans-decreasing
NEX
A leak in the RF shielding can appear as a: Correct Ans-a "zipper" artifact in the frequency
direction
localized swelling or stagnant blood flow that has seperated from the central streamlines within a
vein Correct Ans-vortex flow
truncation artifact is seen as: Correct Ans-high and low signal intensity bands
what is predictable distribution of flow velocities in layers that parallel the vessel wall called:
Correct Ans-laminar flow
which of the following magnets typically requires the highest on going cost for the power
supply? Correct Ans-resistive
