Which of the following parameters influences SNR the greatest?
A. TR
B. Receive bandwidth
C. FOV
D. NSA correct answersC. FOV
Increasing the FOV from 120mm to 240mm will have what effect on SNR?
A. SNR decrease by a factor of 2
B. SNR decrease by a factor of 4
C. SNR increases by a factor...
Which of the following parameters influences SNR the greatest?
A. TR
B. Receive bandwidth
C. FOV
D. NSA correct answersC. FOV
Increasing the FOV from 120mm to 240mm will have what effect on SNR?
A. SNR decrease by a factor of 2
B. SNR decrease by a factor of 4
C. SNR increases by a factor of 4
D. SNR increases by a factor of 2 correct answersC. SNR increases by a factor of 4
TR is the parameter that represents the time between consecutive:
A. Spatial saturation pulses
B. Gradient applications
C. Rephasing pulses
D. Excitation pulses correct answersD. Excitation pulses
Where should a saturation band be placed during an MRA of the circle of willis?
A. To the left
B. To the right
C. Inferior to a stack of slices
D. Superior to a stack of slices correct answersC. Inferior to a stack of slices
Gap space is important for reducing ______ within images
,A. Motion
B. Phase encoding steps
C. All answers are correct
D. Artifacts correct answersD. Artifacts
At 1.5T, the precessional frequency difference between Water and Fat is of _____ Hz
A. 220
B. 212
C. 440
D. 147 correct answersA. 220
If the number of signal averages is increased by a factor of 2, what happens to the SNR? correct
answersA. SNR increases by the square roof of 2
The magneto-hemodynamic effect is observable when using which piece of equipment?
A. Pulse profile
B. Sphygmomanometer
C. pulse oximeter
D. Electrocardiogram correct answersD. Electrocardiogram
Which of the following results as slice thickness increases?
A. T1 contrast increases
B. T2 contrast decreases
C. Spatial resolution increases
D. Spatial resolution decreases correct answersD. Spatial resolution decreases
At 1.5T, STIR pulse sequences use an inversion time with an approximate range of ____ in order to null
the signal from fat
A. 400-550
, B. 100-175
C. 1700-2200
D. 20-50 correct answersB. 100-175ms
During TOF imaging, a flip angle of ____ is used to saturate stationary non-flowing spins?
A. 45-60
B. 70-110
C. 30-45
D. 90+ correct answersA. 45-60
What term describes the accidental administration of contrast agents into surrounding tissue instead of
directly into the vein?
A. Extravasation
B. All answers are correct
C. Infiltration
D. Thrombus correct answersC. Infiltration
_____ personnel can screen patients prior to MRI exams
A. Level 1
B. Level 3
C. Level 4
D. Level 2 correct answersD. Level 2
Incoherent GE pulse sequences are typically used to obtain ____ weighted images?
A. T1 and PD
B. PD
C. T2
D. T1 correct answersA. T1 and PD
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