ARRT MRI MOCK REGISTRY EXAM 2025 QUESTIONS AND ANSWERS

ARRT MRI MOCK REGISTRY EXAM
2025 QUESTIONS AND ANSWERS


When imaging a geriatric patient, while performing a PCA MRA sequence, what imaging
parameter might the operator adjust?
A. Field of view
B. Presaturation band location
C. Slice thickness
D. VENC

E. Contrast injection rate - ANS VENC


As the number of phase encodings is increased from 256 to 512, SNR (signal to noise ratio):
A. Increases
B. Decreases
C. Doubles
D. Does not change

E. Quadruples - ANS Decreases


A magnetic vector possesses attributes of both __________ and _____________.
A. Strength; magnitude
B. Direction; purpose
C. Strength; flow

D. Magnitude; direction - ANS Magnitude; direction



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, What element in the body is the principal nucleus utilized in clinical MR imaging?
A. Helium
B. Hydrogen
C. Oxygen

D. Calcium - ANS Hydrogen


Which of the following best describes an IR sequence?
A. A 180° pulse followed by a 90°/180° combination
B. A 90° pulse followed by a 180° pulse
C. A train of gradient echoes

D. A train of spin echoes - ANS A 180° pulse followed by a 90°/180° combination


Gradient echo sequences requiring high signal from fluid are known as all of the following
EXCEPT:
A. T2* gradient echo
B. Steady-state gradient echo
C. Coherent gradient echo

D. Incoherent gradient echo - ANS Incoherent gradient echo


The medial and lateral rectus muscles are located in the:
A. Ears
B. Posterior pelvic region
C. Proximal calves
D. Eyes
E. Superior shoulder regions

F. Soft tissues of the neck - ANS Eyes




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, Reducing the number of lines filled in k-space will produce an image:
A. With a decrease in spatial resolution
B. With a increase in spatial resolution
C. With an decrease in overall SNR
D. With an increase in overall SNR
E. With a reduced overall scan time
F. B, C and E only

G. A, D and E only - ANS A, D and E only




Reducing the number of lines filled in k-space reduces the number of phase encoding steps,
resulting in shorter scan time, an increase in overall SNR, but a decrease in spatial resolution.


The smallest object that can be resolved in an image acquired with a 24cm FOV and a 272 x 272
matrix is _________ mm.
A. 0.76mm
B. 0.88mm
C. 0.93mm
D. 1.13mm

E. 1.24mm - ANS 0.88mm


To produce an image based on differences in T1, the time interval between 90° excitation
pulses should be:
A. Long
B. Short
C. Refocussed

D. Inverted - ANS Short



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, The energy used to form MRI images is ____________ the patient's tissues.
A. Emitted from
B. Attenuated by
C. Amplified from

D. Reflected off - ANS Emitted from


Referencing the Centers for Disease Control and Prevention (CDC), what type of isolation
precautions should be used for HIV-positive patients in the MRI suite?
A. Respiratory
B. Droplet
C. Standard (universal)
D. Enteric

E. Contact - ANS Standard (universal)


___________ could be used to line the walls and/or floors of the MR magnet room to reduce
the fringe field, and is defined as __________ shielding.
A. Copper; active
B. Steel; active
C. Copper; passive
D. Steel; passive

E. Lead; active - ANS Steel; passive


If the TR in a gradient echo sequence is less than the T2 (or T2*), the resulting condition is
known as:
A. Spin down
B. Steady state
C. Spin dephasement

D. Thermal equilibrium - ANS Steady state

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