Physics 2 Quiz 1.2

1. As TE increases, a higher proportion of flowing nuclei have _____ the slice between the excitation pulse and rephasing pulse.

Stayed the same between

Exited

None of these

Entered

2. 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?

Presaturation Band

Chemical Presaturation

Spatial Presaturation

3. Fat or water saturation is most effective on _______field systems.

High

Low

None of these

Mid

4. Entry slice phenomenon _________if nuclei receive repeated excitations.

None of these

Decreases

Increases

Stays the same

5. Vortex flow is flow that is initially laminar but then passes through a stricture of stenosis in the vessel?

True

False

6. To saturate or null fat or water, the precessional difference between the two must be sufficiently _______ so that they can be isolated from each other.

Medium

Large

Small

None of these

7. For flowing nuclei, to produce a signal, nucleus must receive a 90 degree (excitation) and a 180 degree (rephasing) pulse. This is known as?

Dark Blood Technique

Time of flight phenomena

High velocity signal loss

Entry slice phenomena

8. As velocity of flow increases, the time of flight effect:

Reverses

Increases

Decreases

Stays the same

9. Gradient moment nulling predominantly increases intra-voxel dephasing?

True

False

10. Entry slice phenomenon (inflow effect) is most prominent in ______slice of "stack" of slices.

Last

First

Second

Middle

11. Turbulent flow is flow at different velocities that fluctuates randomly?

True

False

12. The causes of flow artifacts are known as flow phenomena. The principle phenomena are all of the following except:

Exta-voxel dephasing

Entry slice phenomenon

Time of flight

Intra-voxel dephasing

13. Spatial pre-saturation nullifies the signal from flowing nuclei so the effects of entry slice and time of flight phenomena are minimized

True

False

14. The four principal types of flow are all of the following except:

Circular flow

Vortex flow

Turbulent flow

Spiral flow

Laminar flow

15. All of the following affect entry slice phenomenon except:

TR

Slice Thickness

Phase Matrix

Direction of flow

Velocity of flow

16. In what orientation and position, should a saturation region be located in order to eliminate carotid flow from transverse images of the cervical spine?

Transverse, inferior to the region of interest

Transverse, superior to the region of interest

Coronally, anterior to the spine

Coronally. posterior to the spine

17. Flow related enhancement increases as the: (select all that apply)

TE decrease

Velocity of flow decreases

Velocity of flow increase

TE increases

Slice thickness increases

Slice thickness decreases

Submit

18. Second order motion can be compensated for as system can only correct for flow that is at constant velocity and direction during data acquisition.

True

False

19. Counter-current flow has flowing nuclei traveling in _______ direction to slice excitation.

None of these

Same

Both

Opposite

20. Time of flight effects depend of the following: (Select all that apply)

Velocity of flow

Flip angle

Slice thickness

TE

Matrix

Submit

Physics 2 Quiz 1.2

1. As TE increases, a higher proportion of flowing nuclei have _____ the slice between the excitation pulse and rephasing pulse.

2.

What first name or nickname would you like us to use?

2. 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?

3. Fat or water saturation is most effective on _______field systems.

4. Entry slice phenomenon _________if nuclei receive repeated excitations.

5. Vortex flow is flow that is initially laminar but then passes through a stricture of stenosis in the vessel?

6. To saturate or null fat or water, the precessional difference between the two must be sufficiently _______ so that they can be isolated from each other.

7. For flowing nuclei, to produce a signal, nucleus must receive a 90 degree (excitation) and a 180 degree (rephasing) pulse. This is known as?

8. As velocity of flow increases, the time of flight effect:

9. Gradient moment nulling predominantly increases intra-voxel dephasing?

10. Entry slice phenomenon (inflow effect) is most prominent in ______slice of "stack" of slices.

11. Turbulent flow is flow at different velocities that fluctuates randomly?

12. The causes of flow artifacts are known as flow phenomena. The principle phenomena are all of the following except:

13. Spatial pre-saturation nullifies the signal from flowing nuclei so the effects of entry slice and time of flight phenomena are minimized

14. The four principal types of flow are all of the following except:

15. All of the following affect entry slice phenomenon except:

16. In what orientation and position, should a saturation region be located in order to eliminate carotid flow from transverse images of the cervical spine?

17. Flow related enhancement increases as the: (select all that apply)

18. Second order motion can be compensated for as system can only correct for flow that is at constant velocity and direction during data acquisition.

19. Counter-current flow has flowing nuclei traveling in _______ direction to slice excitation.

20. Time of flight effects depend of the following: (Select all that apply)