1
ARRT
ARRT MRI REVIEW EXAM QUESTIONS WITH
CORRECT VERIFIED ANSWERS LATEST UPDATE
(2024/2025) GUARANTEED PASS
what happens to metal artifacts in FSE sequences - ANS ✓they are
significantly reduced because of the repeated 180 RF pulses compensate for field
inhomogeneities
what weighting can you achieve with FSE/TSE? - ANS ✓T1 (with shorter
ETLs)
PD
T2
long turbo factors (ETLs) is associated with ____ weighting - ANS ✓T2
FSE involve applying the ______ multiple times in a TR period at varying
amplitudes and polarity - ANS ✓phase encoding gradient
image weighting in a FSE/TSE is determined by selecting a _______ - ANS
✓effective TE
ARRT MRI
, 2
ARRT
define single shot turbo spin echoes (SS-FSE) - ANS ✓have even shorter scan
times than FSE/TSE because they fill all lines of k-space at once
combines partial fourier technique with FSE, meaning half the lines of k-space
are filled in one TR and the other half are transposed
driven equilibrium uses what techniques - ANS ✓a reverse flip angle
excitation pulse applied at the end of the echo train so that any transverse
magnetization is flipped in to the longitudinal plane and available for excitation
at the beginning of the next TR
a 180 RF pulse requires ____ times more energy than a 90 RF pulse - ANS ✓4
inversion recovery sequences begin with a - ANS ✓180 RF pulse before the
excitation pulse
define TI time - ANS ✓the time from the 180 RF inverting pulse to the 90 RF
excitation pulse, and the image weighting is largely determined by the ti time
IR is used to produce heavily ____ weighted images - ANS ✓T1
ARRT MRI
, 3
ARRT
define fast inversion recovery - ANS ✓begins with 180 RF inverting pulse
followed by a 90 RF at TI time, then a train of 180 rephasing pulses to fill out
multiple lines of k space as in FSE/TSE
define STIR - ANS ✓IR pulse sequence that uses a TI time that corresponds to
the time it takes the fat vector to recover from full inversion to the transverse
plan so that there is no longitudinal magnetization corresponding to fat
the TI required to null signal from a tissue is always _____times its T1
relaxation time - ANS ✓0.69
is a STIR a post contrast sequence - ANS ✓no, because it may null enhancing
tissue
what does FLAIR stand for - ANS ✓fluid attenuated inversion recovery
what phenomenon causes fat to remain bright on T2 weighted images - ANS
✓j coupling
how gradient echoes differ from spin echoes - ANS ✓1) they use variable RF
excitation pulse flip angles as opposed to 90 RF excitation pulse flip angles that
are common in spin-echo pulse sequences
ARRT MRI
, 4
ARRT
2) they use gradients rather than RF pulses to rephase the magnetic moments of
hydrogen nuclei to form an echo
main purpose is to enable shorter TRs (shorter scan times)
what are gradients that dephase called - ANS ✓spoilers
what are gradients that rephase called - ANS ✓rewinders
whether a gradient field adds or subtracts from the main magnetic field
depends on the direction of current that passes through the gradient coils.
this is called ______ of the gradient - ANS ✓polarity
why are gradients not able to achieve true T2 weighting - ANS ✓there is no
compensation for magnetic field inhomogeneities, gradient rephasing does not
remove the contribution made by T2* decay processes
what is the flip angle for a T1 weighting GRE - ANS ✓large
(short TR and short TE)
what is the flip angle for a T2* weighted GRE - ANS ✓small
ARRT MRI
ARRT
ARRT MRI REVIEW EXAM QUESTIONS WITH
CORRECT VERIFIED ANSWERS LATEST UPDATE
(2024/2025) GUARANTEED PASS
what happens to metal artifacts in FSE sequences - ANS ✓they are
significantly reduced because of the repeated 180 RF pulses compensate for field
inhomogeneities
what weighting can you achieve with FSE/TSE? - ANS ✓T1 (with shorter
ETLs)
PD
T2
long turbo factors (ETLs) is associated with ____ weighting - ANS ✓T2
FSE involve applying the ______ multiple times in a TR period at varying
amplitudes and polarity - ANS ✓phase encoding gradient
image weighting in a FSE/TSE is determined by selecting a _______ - ANS
✓effective TE
ARRT MRI
, 2
ARRT
define single shot turbo spin echoes (SS-FSE) - ANS ✓have even shorter scan
times than FSE/TSE because they fill all lines of k-space at once
combines partial fourier technique with FSE, meaning half the lines of k-space
are filled in one TR and the other half are transposed
driven equilibrium uses what techniques - ANS ✓a reverse flip angle
excitation pulse applied at the end of the echo train so that any transverse
magnetization is flipped in to the longitudinal plane and available for excitation
at the beginning of the next TR
a 180 RF pulse requires ____ times more energy than a 90 RF pulse - ANS ✓4
inversion recovery sequences begin with a - ANS ✓180 RF pulse before the
excitation pulse
define TI time - ANS ✓the time from the 180 RF inverting pulse to the 90 RF
excitation pulse, and the image weighting is largely determined by the ti time
IR is used to produce heavily ____ weighted images - ANS ✓T1
ARRT MRI
, 3
ARRT
define fast inversion recovery - ANS ✓begins with 180 RF inverting pulse
followed by a 90 RF at TI time, then a train of 180 rephasing pulses to fill out
multiple lines of k space as in FSE/TSE
define STIR - ANS ✓IR pulse sequence that uses a TI time that corresponds to
the time it takes the fat vector to recover from full inversion to the transverse
plan so that there is no longitudinal magnetization corresponding to fat
the TI required to null signal from a tissue is always _____times its T1
relaxation time - ANS ✓0.69
is a STIR a post contrast sequence - ANS ✓no, because it may null enhancing
tissue
what does FLAIR stand for - ANS ✓fluid attenuated inversion recovery
what phenomenon causes fat to remain bright on T2 weighted images - ANS
✓j coupling
how gradient echoes differ from spin echoes - ANS ✓1) they use variable RF
excitation pulse flip angles as opposed to 90 RF excitation pulse flip angles that
are common in spin-echo pulse sequences
ARRT MRI
, 4
ARRT
2) they use gradients rather than RF pulses to rephase the magnetic moments of
hydrogen nuclei to form an echo
main purpose is to enable shorter TRs (shorter scan times)
what are gradients that dephase called - ANS ✓spoilers
what are gradients that rephase called - ANS ✓rewinders
whether a gradient field adds or subtracts from the main magnetic field
depends on the direction of current that passes through the gradient coils.
this is called ______ of the gradient - ANS ✓polarity
why are gradients not able to achieve true T2 weighting - ANS ✓there is no
compensation for magnetic field inhomogeneities, gradient rephasing does not
remove the contribution made by T2* decay processes
what is the flip angle for a T1 weighting GRE - ANS ✓large
(short TR and short TE)
what is the flip angle for a T2* weighted GRE - ANS ✓small
ARRT MRI
