AMI 302 Final Review
Study online at https://quizlet.com/_jikwen
1. In a 1T field, H protons 1 me- 43.2; 42.6 x field strength. 42.6 x 1.014 = 43.2MHz
ter from isocenter will pre-
cess at ____ if a 14mT/m gra-
dient is applied.
2. The slew rate is: gradient rise time and amplitude combined; mt/second
3. The duty cycle is: Percentage of time a gradient is applied.
4. The gradient amplitude is: Slope and strength of a gradient
5. The z coils are positioned on False; The z coils are positioned at the head and foot. Y are
the front and back of the gra- positioned on the front and back producing coronal images.
dient cylinder and produce
axial images. (true or false)
6. The Y gradient could logically true; Y or Z could be used.
be used for frequency encod-
ing in a sagittal image. ( true
or false)
7. When a gradient is ap- increase in isocenter in one direction and decrease in the other.
plied, precessional frequen-
cies will....
8. The process of shimming is make the field more homogenous
to:
9. The shields do: Contain the main field to a smaller area
10. The gradient: Gradually adjusts the precessional frequencies of nuclei
11. Passive shields are: Steel lined walls
1/7
, AMI 302 Final Review
Study online at https://quizlet.com/_jikwen
12. RF cage is made with Copper
13. Which of the following de- Heating at skin surface contact points
scribes the antenna effect?
14. RF or zipper artifacts on im- Stray RF or artifacts from outside the MR room entering.
ages are caused by
15. List some differences in a re- a resistive magnet needs a power source and can be turned off
sistive magnet and a super- easily while a superconducting magnet cannot be shut off easily.
conducting magnet: The superconducting magnet is more powerful.
16. Increased gradient ampli- thinner slices
tudes allow for:
17. Decreased gradient ampli- Larger FOV's (field of views)
tudes allow for
18. The MR technologist will typi- primary recieve coil
cally position and place which
system component prior to
each exam?
19. What is true regarding vol- They wrap completely around the part, provide uniform signal,
ume coils? and cause an increase in noise.
20. Which logical gradient could y and z
be used to phase encode this
image?
2/7
Study online at https://quizlet.com/_jikwen
1. In a 1T field, H protons 1 me- 43.2; 42.6 x field strength. 42.6 x 1.014 = 43.2MHz
ter from isocenter will pre-
cess at ____ if a 14mT/m gra-
dient is applied.
2. The slew rate is: gradient rise time and amplitude combined; mt/second
3. The duty cycle is: Percentage of time a gradient is applied.
4. The gradient amplitude is: Slope and strength of a gradient
5. The z coils are positioned on False; The z coils are positioned at the head and foot. Y are
the front and back of the gra- positioned on the front and back producing coronal images.
dient cylinder and produce
axial images. (true or false)
6. The Y gradient could logically true; Y or Z could be used.
be used for frequency encod-
ing in a sagittal image. ( true
or false)
7. When a gradient is ap- increase in isocenter in one direction and decrease in the other.
plied, precessional frequen-
cies will....
8. The process of shimming is make the field more homogenous
to:
9. The shields do: Contain the main field to a smaller area
10. The gradient: Gradually adjusts the precessional frequencies of nuclei
11. Passive shields are: Steel lined walls
1/7
, AMI 302 Final Review
Study online at https://quizlet.com/_jikwen
12. RF cage is made with Copper
13. Which of the following de- Heating at skin surface contact points
scribes the antenna effect?
14. RF or zipper artifacts on im- Stray RF or artifacts from outside the MR room entering.
ages are caused by
15. List some differences in a re- a resistive magnet needs a power source and can be turned off
sistive magnet and a super- easily while a superconducting magnet cannot be shut off easily.
conducting magnet: The superconducting magnet is more powerful.
16. Increased gradient ampli- thinner slices
tudes allow for:
17. Decreased gradient ampli- Larger FOV's (field of views)
tudes allow for
18. The MR technologist will typi- primary recieve coil
cally position and place which
system component prior to
each exam?
19. What is true regarding vol- They wrap completely around the part, provide uniform signal,
ume coils? and cause an increase in noise.
20. Which logical gradient could y and z
be used to phase encode this
image?
2/7
