ARRT MRI Mock Registry questions and
answers
What factors affect spatial resolution? - ANSWER FOV
Slice Thickness
Matrix
All of the Above
A resistive MRI magnet is classified as: - ANSWER A magnet type is classified as being
constructed of ferrous metal that never loses it's magnetization.
A magnet that uses a delivered electrical current through loops of wire in order to
produce a magnetic field that can be turned on and off.
A magnet type that uses cryogens in order to cool loops of wire to eliminate resistance
and maintain a strong magnetic field.
A magnet type that uses the earth's magnetic field in order to produce diagnostic
images.
True or False: Patient clothing may contain invisible metallic conductive fibers which
can cause patient burns during MR imaging. - ANSWER True/False
The Styloid Process of the Radius is highlighted in this image by what region of interest
(ROI)? - ANSWER A
B
C
D
Why do Ferromagnetic materials pose a safety risk? - ANSWER Because they can
become projectiles
What causes Diamagnetic materials to be slightly repelled by a magnetic field? -
ANSWER Lenz effects
What is made up of a copper mesh and surrounds the scan room in order to eliminate
external RF energy from entering and causing an artifact? - ANSWER RF shielding
(Also known as a Faraday Cage)
What magnets require a large amount of energy to run? - ANSWER Resistive
What coils are turned on to perform slice select, phase, and frequency encoding? -
ANSWER Gradient
_________ Imaging uses multiple, identical measurements repeated over time in order
to visualize moving structures and/or the changes in signal intensity caused by contrast
media. - ANSWER Dynamic
,___________ is the range of frequencies that is recorded during frequency encoding. -
ANSWER Receiver bandwidth
What are the normal levels for blood oxygen saturation? - ANSWER 95-100%
___________ is the range of frequencies used in the RF excitation pulse to excite a
slice. - ANSWER Transmit Bandwidth
What is the process of removing the magnetic field in a superconducting magnet, by
expelling the cryogens that cool the main magnet and can happen spontaneously by a
leak and sudden boil off the cryogens or be initiated by the MRI technologist? -
ANSWER Quench (or Quenching)
Superconducting magnets use liquid Helium (Cryogen) to cool the Niobium Titanium
coils to approximately _______________. - ANSWER 4 degrees Kelvin
The ______________ will determine the number of lines filled in k-space in each TR
period. - ANSWER Echo train length
What refers to the amount of longitudinal magnetization "flipped" into the transverse
plane? - ANSWER Flip angle
A flip angle of ___________ will result in the highest amount of transverse
magnetization and MRI signal. - ANSWER 90°
VENC - ANSWER 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
Decreases - ANSWER 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
Magnitude; direction - ANSWER A magnetic vector possesses attributes of both
__________ and _____________.
A. Strength; magnitude
B. Direction; purpose
C. Strength; flow
,D. Magnitude; direction
Hydrogen - ANSWER What element in the body is the principal nucleus utilized in
clinical MR imaging?
A. Helium
B. Hydrogen
C. Oxygen
D. Calcium
A 180° pulse followed by a 90°/180° combination - ANSWER 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
Incoherent gradient echo - ANSWER 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
Eyes - ANSWER 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
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. - ANSWER 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
, 0.88mm - ANSWER 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
Short - ANSWER 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
Emitted from - ANSWER The energy used to form MRI images is ____________ the
patient's tissues.
A. Emitted from
B. Attenuated by
C. Amplified from
D. Reflected off
Standard (universal) - ANSWER 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
Steel; passive - ANSWER ___________ 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
Steady state - ANSWER 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
answers
What factors affect spatial resolution? - ANSWER FOV
Slice Thickness
Matrix
All of the Above
A resistive MRI magnet is classified as: - ANSWER A magnet type is classified as being
constructed of ferrous metal that never loses it's magnetization.
A magnet that uses a delivered electrical current through loops of wire in order to
produce a magnetic field that can be turned on and off.
A magnet type that uses cryogens in order to cool loops of wire to eliminate resistance
and maintain a strong magnetic field.
A magnet type that uses the earth's magnetic field in order to produce diagnostic
images.
True or False: Patient clothing may contain invisible metallic conductive fibers which
can cause patient burns during MR imaging. - ANSWER True/False
The Styloid Process of the Radius is highlighted in this image by what region of interest
(ROI)? - ANSWER A
B
C
D
Why do Ferromagnetic materials pose a safety risk? - ANSWER Because they can
become projectiles
What causes Diamagnetic materials to be slightly repelled by a magnetic field? -
ANSWER Lenz effects
What is made up of a copper mesh and surrounds the scan room in order to eliminate
external RF energy from entering and causing an artifact? - ANSWER RF shielding
(Also known as a Faraday Cage)
What magnets require a large amount of energy to run? - ANSWER Resistive
What coils are turned on to perform slice select, phase, and frequency encoding? -
ANSWER Gradient
_________ Imaging uses multiple, identical measurements repeated over time in order
to visualize moving structures and/or the changes in signal intensity caused by contrast
media. - ANSWER Dynamic
,___________ is the range of frequencies that is recorded during frequency encoding. -
ANSWER Receiver bandwidth
What are the normal levels for blood oxygen saturation? - ANSWER 95-100%
___________ is the range of frequencies used in the RF excitation pulse to excite a
slice. - ANSWER Transmit Bandwidth
What is the process of removing the magnetic field in a superconducting magnet, by
expelling the cryogens that cool the main magnet and can happen spontaneously by a
leak and sudden boil off the cryogens or be initiated by the MRI technologist? -
ANSWER Quench (or Quenching)
Superconducting magnets use liquid Helium (Cryogen) to cool the Niobium Titanium
coils to approximately _______________. - ANSWER 4 degrees Kelvin
The ______________ will determine the number of lines filled in k-space in each TR
period. - ANSWER Echo train length
What refers to the amount of longitudinal magnetization "flipped" into the transverse
plane? - ANSWER Flip angle
A flip angle of ___________ will result in the highest amount of transverse
magnetization and MRI signal. - ANSWER 90°
VENC - ANSWER 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
Decreases - ANSWER 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
Magnitude; direction - ANSWER A magnetic vector possesses attributes of both
__________ and _____________.
A. Strength; magnitude
B. Direction; purpose
C. Strength; flow
,D. Magnitude; direction
Hydrogen - ANSWER What element in the body is the principal nucleus utilized in
clinical MR imaging?
A. Helium
B. Hydrogen
C. Oxygen
D. Calcium
A 180° pulse followed by a 90°/180° combination - ANSWER 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
Incoherent gradient echo - ANSWER 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
Eyes - ANSWER 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
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. - ANSWER 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
, 0.88mm - ANSWER 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
Short - ANSWER 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
Emitted from - ANSWER The energy used to form MRI images is ____________ the
patient's tissues.
A. Emitted from
B. Attenuated by
C. Amplified from
D. Reflected off
Standard (universal) - ANSWER 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
Steel; passive - ANSWER ___________ 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
Steady state - ANSWER 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
