©JASONMcCONNELL 2024/2025 ALL RIGHTS RESERVED 1/28/2025.
MRI PHYSICS 2 FINAL Exam Questions
With Correct Answers 100% Verified.
Gradient Echo - Answer✔In regards to MRI and flowing blood, all of the following naturally
offer dark blood without any special imaging requirements, except which?
Gradient Echo
Fast Spin Echo
Spin Echo
Inversion Recovery
False - Answer✔True or False:
Gradient moment nulling predominantly increases intra-voxel dephasing?
Time of Flight phenomena - Answer✔If flowing nuclei receive a 90 degree (excitation) but do
not receive a 180 degree (rephasing) pulse, no echo will be produced. This is known as?
Co-current - Answer✔Flow that is in the same direction as slice selection is called?
High - Answer✔Fat or water saturation is most effective on ______ field systems.
Gradient moment nulling - Answer✔____________ is when flowing spins gains 90 degree phase
as it passes the first positive lobe of gradient, then loses 180 degree as it passes through the
double negative lobe of gradient, then passes through the last positive lobe of gradient.
Large - Answer✔To saturate or null fat or water, the precessional difference between the two
must sufficiently ________ so that they can be isolated from each other.
Velocity of flow decreases
TE decrease
Slice thickness increases - Answer✔Flow related enhancement increases as the: (select all that
apply)
False - Answer✔True or False:
For a constant velocity, nuclei take longer to travel through a thin slice compared with a thick
slice.
1|Page
, ©JASONMcCONNELL 2024/2025 ALL RIGHTS RESERVED 1/28/2025.
Decrease - Answer✔A pulse sequence with a given set of parameters allows a maximum of 20
slices. If 2 saturation pulses are added, one would expect the maximum number of slices to:
Fat saturation - Answer✔Which of the following techniques would be ineffective at reducing
motion artifacts created by blood flowing through the sagittal sinus?
Chemical pre saturation - Answer✔A method in which the specific frequency of just fat, or
water, is transmitted to push just those protons into transverse magnetization prior to the 90
degree RF pulse is known as what?
First - Answer✔Entry slice phenomena (inflow effect) is most prominent in ________ slice of
"stack" of slices.
True - Answer✔True or False:
Turbulent flow is flow at different velocities that fluctuates randomly?
Opposite - Answer✔Counter-current flow has flowing nuclei traveling in __________ direction
to slice excitation.
2.2 - Answer✔Out of phase TE at 1.5T is approximately?
147 Hz - Answer✔The precessional frequency difference of fat and water at 1.0T is?
Decreases - Answer✔Entry slice phenomena _________ if nuclei receive repeated excitations.
TE
Velocity of flow
Slice thickness - Answer✔TOF effects depend on the following: (select all that apply)
TR
Slice thickness
Velocity of flow
Direction of flow - Answer✔Magnitude of entry slice phenomena depends on the following:
(select all that apply)
At the first slice in the stack
When using a long TR
In thin slices - Answer✔Entry slice phenomena increases: (select all that apply)
Using a fast spin echo pulse sequence - Answer✔All of the following are ways of compensating
for flow phenomena except:
Gradient Moment Nulling
2|Page
, ©JASONMcCONNELL 2024/2025 ALL RIGHTS RESERVED 1/28/2025.
Even Echo Rephasing
Spatial Presaturation
Using a fast spin echo pulse sequence
True - Answer✔True or False:
Vortex flow is flow that is initially laminar but then passes through a stricture or stenosis in the
vessel?
Even echo rephasing - Answer✔If there is two or more echoes produced in a fast spin echo pulse
sequence, intravoxel dephasing may be reduced by acquiring the second and succeeding even
echoes at multiple of the first TE. This is known as:
Phase - Answer✔If a flowing nucleus is adjacent to a stationary nucleus in a voxel, there is a
__________ difference between the two nuclei.
Extra-voxel dephasing - Answer✔The causes of flow artifacts are known as flow phenomena.
The principle phenomena are all of the following except:
TOF
Intra-voxel dephasing
Extra-voxel dephasing
Entry slice phenomena
Scan TR divided by number of slices - Answer✔The SAT TR is equal to?
Entry-slice phenomena - Answer✔The phenomena that occurs when moving protons, usually
when moving perpendicular to the slice plane, appear brighter in the first slice than the rest of the
slices is known as what?
Circular flow - Answer✔The four principle types of flow are all of the following except:
Exited - Answer✔As TE increases, a higher proportion of flowing nuclei have ________ the
slice between the excitation pulse and rephasing pulse.
False - Answer✔True or False:
Co-current flow, in regards to entry slice phenomen, is when the moving protons are traveling in
the opposite direction of the slice direction, thus making entry slice phenomena less pronounced.
True - Answer✔True or False:
Spatial pre-saturation nullifies the signal from flowing nuclei so the effects of entry slice and
TOF phenomena are minimized.
False - Answer✔True or False:
3|Page
MRI PHYSICS 2 FINAL Exam Questions
With Correct Answers 100% Verified.
Gradient Echo - Answer✔In regards to MRI and flowing blood, all of the following naturally
offer dark blood without any special imaging requirements, except which?
Gradient Echo
Fast Spin Echo
Spin Echo
Inversion Recovery
False - Answer✔True or False:
Gradient moment nulling predominantly increases intra-voxel dephasing?
Time of Flight phenomena - Answer✔If flowing nuclei receive a 90 degree (excitation) but do
not receive a 180 degree (rephasing) pulse, no echo will be produced. This is known as?
Co-current - Answer✔Flow that is in the same direction as slice selection is called?
High - Answer✔Fat or water saturation is most effective on ______ field systems.
Gradient moment nulling - Answer✔____________ is when flowing spins gains 90 degree phase
as it passes the first positive lobe of gradient, then loses 180 degree as it passes through the
double negative lobe of gradient, then passes through the last positive lobe of gradient.
Large - Answer✔To saturate or null fat or water, the precessional difference between the two
must sufficiently ________ so that they can be isolated from each other.
Velocity of flow decreases
TE decrease
Slice thickness increases - Answer✔Flow related enhancement increases as the: (select all that
apply)
False - Answer✔True or False:
For a constant velocity, nuclei take longer to travel through a thin slice compared with a thick
slice.
1|Page
, ©JASONMcCONNELL 2024/2025 ALL RIGHTS RESERVED 1/28/2025.
Decrease - Answer✔A pulse sequence with a given set of parameters allows a maximum of 20
slices. If 2 saturation pulses are added, one would expect the maximum number of slices to:
Fat saturation - Answer✔Which of the following techniques would be ineffective at reducing
motion artifacts created by blood flowing through the sagittal sinus?
Chemical pre saturation - Answer✔A method in which the specific frequency of just fat, or
water, is transmitted to push just those protons into transverse magnetization prior to the 90
degree RF pulse is known as what?
First - Answer✔Entry slice phenomena (inflow effect) is most prominent in ________ slice of
"stack" of slices.
True - Answer✔True or False:
Turbulent flow is flow at different velocities that fluctuates randomly?
Opposite - Answer✔Counter-current flow has flowing nuclei traveling in __________ direction
to slice excitation.
2.2 - Answer✔Out of phase TE at 1.5T is approximately?
147 Hz - Answer✔The precessional frequency difference of fat and water at 1.0T is?
Decreases - Answer✔Entry slice phenomena _________ if nuclei receive repeated excitations.
TE
Velocity of flow
Slice thickness - Answer✔TOF effects depend on the following: (select all that apply)
TR
Slice thickness
Velocity of flow
Direction of flow - Answer✔Magnitude of entry slice phenomena depends on the following:
(select all that apply)
At the first slice in the stack
When using a long TR
In thin slices - Answer✔Entry slice phenomena increases: (select all that apply)
Using a fast spin echo pulse sequence - Answer✔All of the following are ways of compensating
for flow phenomena except:
Gradient Moment Nulling
2|Page
, ©JASONMcCONNELL 2024/2025 ALL RIGHTS RESERVED 1/28/2025.
Even Echo Rephasing
Spatial Presaturation
Using a fast spin echo pulse sequence
True - Answer✔True or False:
Vortex flow is flow that is initially laminar but then passes through a stricture or stenosis in the
vessel?
Even echo rephasing - Answer✔If there is two or more echoes produced in a fast spin echo pulse
sequence, intravoxel dephasing may be reduced by acquiring the second and succeeding even
echoes at multiple of the first TE. This is known as:
Phase - Answer✔If a flowing nucleus is adjacent to a stationary nucleus in a voxel, there is a
__________ difference between the two nuclei.
Extra-voxel dephasing - Answer✔The causes of flow artifacts are known as flow phenomena.
The principle phenomena are all of the following except:
TOF
Intra-voxel dephasing
Extra-voxel dephasing
Entry slice phenomena
Scan TR divided by number of slices - Answer✔The SAT TR is equal to?
Entry-slice phenomena - Answer✔The phenomena that occurs when moving protons, usually
when moving perpendicular to the slice plane, appear brighter in the first slice than the rest of the
slices is known as what?
Circular flow - Answer✔The four principle types of flow are all of the following except:
Exited - Answer✔As TE increases, a higher proportion of flowing nuclei have ________ the
slice between the excitation pulse and rephasing pulse.
False - Answer✔True or False:
Co-current flow, in regards to entry slice phenomen, is when the moving protons are traveling in
the opposite direction of the slice direction, thus making entry slice phenomena less pronounced.
True - Answer✔True or False:
Spatial pre-saturation nullifies the signal from flowing nuclei so the effects of entry slice and
TOF phenomena are minimized.
False - Answer✔True or False:
3|Page
