ARRT MRI FINAL EXAM QUESTIONS WITH
VERIFIED SOLUTIONS NEW MODIFIED GRADED
A+ TESTED AND APPROVED 2026 LATEST
The gradient that is on during the production of the echo is the __________
encoding gradient --CORRECT ANSWER--frequency
The gradient that is on longest is the __________ encoding gradient --
CORRECT ANSWER--frequency
The four phases of a spin echo pulse sequence, in correct order, are --
CORRECT ANSWER--Excitation, encoding, refocusing, readout.
Using an NSA of 3, if a phase resolution of 192 is desired, then the TR must be
repeated --CORRECT ANSWER--576 times
In a fast spin echo sequence, the effective TE is the echo that is performed with
the --CORRECT ANSWER--Low amplitude phase encoding gradient.
In a 2D multiecho pulse sequence, ETL = 8, scan time is given by the equation
TR x --CORRECT ANSWER--Number of signals averaged x number of phase
encodings / the number of echoes.
Page 1 of 36
,When using MRA to evaluate extracranial vascular flow, such as that within
common carotid arteries, a recommended technique is --CORRECT ANSWER-
-2D time of flight MRA
When using bright blood MRA to evaluate peripheral vascular flow, such as
that within the arteries of the legs, saturation pulses are --CORRECT
ANSWER--placed inferior to the acquired slices
In a 3D acquisition, the slices are produced by --CORRECT ANSWER--A
phase encoding gradient applied in the slice direction. Acquired by volume
imaging.
3D gradient echo axial views can be used in cervical spine imaging to provide --
CORRECT ANSWER--Thin, contiguous sections of the spine, the ability to
reformat into any other imaging plane, retrospectively, the ability to get either
T1, spin density or T2* information by changing parameters.
In complete spine imaging, to rule out metastatic lesions of the spinal cord,
contrast enhancement can be used with T1 weighted images because --
CORRECT ANSWER--metastatic lesions enhance and normal cord does not
Due to the differences in frequencies across the magnetic field we --CORRECT
ANSWER--use gradients, use sat bands, . use different coils
Page 2 of 36
,To avoid the "magic angle" (an artifactual brightness seen in the medial
segment of the posterior horn of the lateral meniscus when short TEs are used)
artifact when imaging the knee, --CORRECT ANSWER--use a longer TE,
reposition the knee, orient the affected anatomy to another angle
To best visualize the anterior cruciate ligament on knee MR --CORRECT
ANSWER--externally rotate the leg about 15
When using MRA to evaluate intracranial vascularity, flow within smaller
vessels can best be demonstrated by --CORRECT ANSWER--3D time of flight
MRA or 3D phase contrast MRA
To produce the echo, a gradient echo pulse sequence uses --CORRECT
ANSWER--a gradient magnetic field only
The rate of dephasing due to inhomogeneities is called --CORRECT ANSWER-
-T2 inhomogeneity
If the TR of a gradient echo pulse sequence is considerably less than the T2
(and T2*), the condition that will exist is known as --CORRECT ANSWER--
steady state
Page 3 of 36
, To create a projection image in MRA, the technique MOST commonly
employed is --CORRECT ANSWER--19. maximum intensity pixel
If a given conventional spin echo pulse sequence takes 12 minutes to acquire, a
multiecho sequence, using a 6 echo train, with all factors that affect scan time
remaining the same, will take ________________ to acquire the same images --
CORRECT ANSWER--2 minutes
Gadolinium chelates are --CORRECT ANSWER--Paramagnetic.
Acquiring half the phase views of k space and then calculating the data for the
other half is a technique known as --CORRECT ANSWER--partial Fourier
The MRA sequence that is more sensitive to slow flow is --CORRECT
ANSWER--2D time of flight
A major advantage of MRA over conventional angiography is that --CORRECT
ANSWER--2D time of flight
The removal of signal from vessels in an MRA sequence is achieved by --
CORRECT ANSWER--spatial presaturation
Page 4 of 36
VERIFIED SOLUTIONS NEW MODIFIED GRADED
A+ TESTED AND APPROVED 2026 LATEST
The gradient that is on during the production of the echo is the __________
encoding gradient --CORRECT ANSWER--frequency
The gradient that is on longest is the __________ encoding gradient --
CORRECT ANSWER--frequency
The four phases of a spin echo pulse sequence, in correct order, are --
CORRECT ANSWER--Excitation, encoding, refocusing, readout.
Using an NSA of 3, if a phase resolution of 192 is desired, then the TR must be
repeated --CORRECT ANSWER--576 times
In a fast spin echo sequence, the effective TE is the echo that is performed with
the --CORRECT ANSWER--Low amplitude phase encoding gradient.
In a 2D multiecho pulse sequence, ETL = 8, scan time is given by the equation
TR x --CORRECT ANSWER--Number of signals averaged x number of phase
encodings / the number of echoes.
Page 1 of 36
,When using MRA to evaluate extracranial vascular flow, such as that within
common carotid arteries, a recommended technique is --CORRECT ANSWER-
-2D time of flight MRA
When using bright blood MRA to evaluate peripheral vascular flow, such as
that within the arteries of the legs, saturation pulses are --CORRECT
ANSWER--placed inferior to the acquired slices
In a 3D acquisition, the slices are produced by --CORRECT ANSWER--A
phase encoding gradient applied in the slice direction. Acquired by volume
imaging.
3D gradient echo axial views can be used in cervical spine imaging to provide --
CORRECT ANSWER--Thin, contiguous sections of the spine, the ability to
reformat into any other imaging plane, retrospectively, the ability to get either
T1, spin density or T2* information by changing parameters.
In complete spine imaging, to rule out metastatic lesions of the spinal cord,
contrast enhancement can be used with T1 weighted images because --
CORRECT ANSWER--metastatic lesions enhance and normal cord does not
Due to the differences in frequencies across the magnetic field we --CORRECT
ANSWER--use gradients, use sat bands, . use different coils
Page 2 of 36
,To avoid the "magic angle" (an artifactual brightness seen in the medial
segment of the posterior horn of the lateral meniscus when short TEs are used)
artifact when imaging the knee, --CORRECT ANSWER--use a longer TE,
reposition the knee, orient the affected anatomy to another angle
To best visualize the anterior cruciate ligament on knee MR --CORRECT
ANSWER--externally rotate the leg about 15
When using MRA to evaluate intracranial vascularity, flow within smaller
vessels can best be demonstrated by --CORRECT ANSWER--3D time of flight
MRA or 3D phase contrast MRA
To produce the echo, a gradient echo pulse sequence uses --CORRECT
ANSWER--a gradient magnetic field only
The rate of dephasing due to inhomogeneities is called --CORRECT ANSWER-
-T2 inhomogeneity
If the TR of a gradient echo pulse sequence is considerably less than the T2
(and T2*), the condition that will exist is known as --CORRECT ANSWER--
steady state
Page 3 of 36
, To create a projection image in MRA, the technique MOST commonly
employed is --CORRECT ANSWER--19. maximum intensity pixel
If a given conventional spin echo pulse sequence takes 12 minutes to acquire, a
multiecho sequence, using a 6 echo train, with all factors that affect scan time
remaining the same, will take ________________ to acquire the same images --
CORRECT ANSWER--2 minutes
Gadolinium chelates are --CORRECT ANSWER--Paramagnetic.
Acquiring half the phase views of k space and then calculating the data for the
other half is a technique known as --CORRECT ANSWER--partial Fourier
The MRA sequence that is more sensitive to slow flow is --CORRECT
ANSWER--2D time of flight
A major advantage of MRA over conventional angiography is that --CORRECT
ANSWER--2D time of flight
The removal of signal from vessels in an MRA sequence is achieved by --
CORRECT ANSWER--spatial presaturation
Page 4 of 36
