MRI Physics Final Exam
2024/2025(Questions With 100% Correct
Answers)A+ Graded Verified
one advantage of 3D TOF-MRA is - ANSWER high resolution for small vessels
one advantage of 2D TOF-MRA is - ANSWER larger coverage area
which conventional pulse sequence below provides black blood images - ANSWER
-spin Echo
-fast spin Echo
-inversion recovery
-all of the above
MRI imaging techniques include - ANSWER time of flight
phase-contrast
contrast-enhanced
all of the above
the available Imaging time when using cardiac gating is defined as - ANSWER
available Imaging time =
R to R interval - ( trigger window +trigger delay )
to improve coverage in 3D TOF-MRA and at the same time maintain signal from blood
flowing within the larger volume, a hybrid technique is used it is called - ANSWER
multiple overlapping thin section angiography
off resonance RF pulses applied to suppress the signals from macromolecules is called -
ANSWER magnetization transfer contrast
what is the approximate delay in milliseconds using peripheral gating versus using ECG
gating - ANSWER 250 ms
which pulse sequence below would you want to use a pre saturation band when Imaging
vasculature - ANSWER conventional spin Echo
fast spin Echo
inversion recovery pulse sequence
all of the above
,in TOF imaging what is applied above or below the image slices to saturate in flowing
spins - ANSWER saturation pulse
which answer below will produce the longest effective TR when cardiac gating -
ANSWER 3 R to R selected effective TR
In PC-MRA, this technique relies on different velocity induced phase shifts - ANSWER
velocity encoding
an advantage to 2D TOF-MRA is - ANSWER sensitive to slow flow
MIP stands for - ANSWER maximum intensity projection
a disadvantage to TOF-MRA is - ANSWER saturation of in plane flow
an advantage to PC-MRA is - ANSWER increased background suppression
a disadvantage to PC-MRA is - ANSWER long scan times in 3D
the trigger window is usually expressed as a percentage of the - ANSWER R to R
interval
the most important safety factor in cardiac gating is - ANSWER Leads and cables
should not be placed crossing or touching the patient's skin
which of the following best described pseudo gating - ANSWER TR that matches the R
to R interval
this method uses to reduce mis-mapping produces by the heart motion - ANSWER
cardiac gating
in cardiac gating, the waiting period before each R-wave is often called - ANSWER
trigger window
what is the name of the waiting period following the R-wave called - ANSWER trigger
delay
what is the delay time of cardiac pulse when using peripheral gating - ANSWER 250
ms
pseudo gating means taking a patient's pulse before the exam and calculating the R to R
interval and selecting the appropriate TR - ANSWER true
black blood Imaging relies on - ANSWER flow related enhancement
, when applying your slices for a 3D pulse sequence to image the carotid arteries which
directions do you require the slices in - ANSWER head to foot direction
what would be the effective TR be of someone with a heart rate of 60 beats per minute -
ANSWER effective TR = 1000 ms
if a patient's heart rate increases while performing a scan using cardiac gating, the R to R
interval will do what in milliseconds - ANSWER will decrease
during cardiac gating, image acquisition Falls between the R to R interval and is acquired
in the same way as in conventional Imaging - ANSWER true
one of the disadvantages of 3D TOF imaging is saturation of in plane flow - ANSWER
true
one advantage of 3D TOF imaging is larger area of coverage - ANSWER false
what is the delay time called after the peak of the R-wave - ANSWER delay after trigger
if a patient's heart rate slows down while performing a scan using cardiac gating, what
happens to the trigger window in milliseconds - ANSWER it increases
what type of flow can be compensated for in MRI - ANSWER laminar flow
which answer below is another remedy for eliminated unwanted background signal when
performing tof MRA - ANSWER magnetization transfer contrast
In an inversion recovery sequence, the order of pulses is which of the following: -
ANSWER 180° RF, 90° RF, 180°
In a conventional spin echo sequence, the order of pulses is which of the following: -
ANSWER 90° RF, 180° RF, echo
At each 180° pulse in a turbo spin echo sequence, a different amplitude of the phase
encoding gradient is applied to fill out a different line of K space - ANSWER True
In a turbo spin echo sequence, the TE that determines the weighting of the image is
called - ANSWER Effective TE
In STIR imaging, the signal from the following is nulled - ANSWER Fat
Double IR prep begins with the two 180° RF pulses - ANSWER True
2024/2025(Questions With 100% Correct
Answers)A+ Graded Verified
one advantage of 3D TOF-MRA is - ANSWER high resolution for small vessels
one advantage of 2D TOF-MRA is - ANSWER larger coverage area
which conventional pulse sequence below provides black blood images - ANSWER
-spin Echo
-fast spin Echo
-inversion recovery
-all of the above
MRI imaging techniques include - ANSWER time of flight
phase-contrast
contrast-enhanced
all of the above
the available Imaging time when using cardiac gating is defined as - ANSWER
available Imaging time =
R to R interval - ( trigger window +trigger delay )
to improve coverage in 3D TOF-MRA and at the same time maintain signal from blood
flowing within the larger volume, a hybrid technique is used it is called - ANSWER
multiple overlapping thin section angiography
off resonance RF pulses applied to suppress the signals from macromolecules is called -
ANSWER magnetization transfer contrast
what is the approximate delay in milliseconds using peripheral gating versus using ECG
gating - ANSWER 250 ms
which pulse sequence below would you want to use a pre saturation band when Imaging
vasculature - ANSWER conventional spin Echo
fast spin Echo
inversion recovery pulse sequence
all of the above
,in TOF imaging what is applied above or below the image slices to saturate in flowing
spins - ANSWER saturation pulse
which answer below will produce the longest effective TR when cardiac gating -
ANSWER 3 R to R selected effective TR
In PC-MRA, this technique relies on different velocity induced phase shifts - ANSWER
velocity encoding
an advantage to 2D TOF-MRA is - ANSWER sensitive to slow flow
MIP stands for - ANSWER maximum intensity projection
a disadvantage to TOF-MRA is - ANSWER saturation of in plane flow
an advantage to PC-MRA is - ANSWER increased background suppression
a disadvantage to PC-MRA is - ANSWER long scan times in 3D
the trigger window is usually expressed as a percentage of the - ANSWER R to R
interval
the most important safety factor in cardiac gating is - ANSWER Leads and cables
should not be placed crossing or touching the patient's skin
which of the following best described pseudo gating - ANSWER TR that matches the R
to R interval
this method uses to reduce mis-mapping produces by the heart motion - ANSWER
cardiac gating
in cardiac gating, the waiting period before each R-wave is often called - ANSWER
trigger window
what is the name of the waiting period following the R-wave called - ANSWER trigger
delay
what is the delay time of cardiac pulse when using peripheral gating - ANSWER 250
ms
pseudo gating means taking a patient's pulse before the exam and calculating the R to R
interval and selecting the appropriate TR - ANSWER true
black blood Imaging relies on - ANSWER flow related enhancement
, when applying your slices for a 3D pulse sequence to image the carotid arteries which
directions do you require the slices in - ANSWER head to foot direction
what would be the effective TR be of someone with a heart rate of 60 beats per minute -
ANSWER effective TR = 1000 ms
if a patient's heart rate increases while performing a scan using cardiac gating, the R to R
interval will do what in milliseconds - ANSWER will decrease
during cardiac gating, image acquisition Falls between the R to R interval and is acquired
in the same way as in conventional Imaging - ANSWER true
one of the disadvantages of 3D TOF imaging is saturation of in plane flow - ANSWER
true
one advantage of 3D TOF imaging is larger area of coverage - ANSWER false
what is the delay time called after the peak of the R-wave - ANSWER delay after trigger
if a patient's heart rate slows down while performing a scan using cardiac gating, what
happens to the trigger window in milliseconds - ANSWER it increases
what type of flow can be compensated for in MRI - ANSWER laminar flow
which answer below is another remedy for eliminated unwanted background signal when
performing tof MRA - ANSWER magnetization transfer contrast
In an inversion recovery sequence, the order of pulses is which of the following: -
ANSWER 180° RF, 90° RF, 180°
In a conventional spin echo sequence, the order of pulses is which of the following: -
ANSWER 90° RF, 180° RF, echo
At each 180° pulse in a turbo spin echo sequence, a different amplitude of the phase
encoding gradient is applied to fill out a different line of K space - ANSWER True
In a turbo spin echo sequence, the TE that determines the weighting of the image is
called - ANSWER Effective TE
In STIR imaging, the signal from the following is nulled - ANSWER Fat
Double IR prep begins with the two 180° RF pulses - ANSWER True
