ARMRIT Practice Exam
Study online at https://quizlet.com/_flkxoa
1. The T2 process is also known as:: Spin-Spin
2. The tissue characteristic that provides more tissue contrast and pathological
information is:: T2 effects
3. The basic process of MR signal generation contains two basic steps, they
are:: Stimulation & Relaxation
4. Which statement is true of the relaxation process?: Without the effects of T2* (star), T2
decay continues
5. Which type of MRI magnet requires cryogen to cool magnetic coils to 4
degrees Kelvin?: Superconductive
6. Tissues that are very efficient at spin-lattice interactions near the Larmor
frequency, such as fatty tissues, should have: Low T1 values and produces hyperintense signals
7. Which type of electromagnetic coils are employed as a transmitter, receiver
or both?: Radio-frequency coils
8. The process of relaxation begins when:: B1 is turned off
9. To symbolize the flow and area of a magnetic field, lines are used which are
called:: Field or flux
10. Which molecule precesses closer to the Larmor frequency?: Fat
11. Which cryogenic material can produce temperature as low as 4 degrees
Kelvin?: Liquid helium
12. Magnetism can be defined as the ability of certain substances to attract:: Iron
Cobalt
Nickel
13. In a large main magnetic field such as those employed in MRI, the motion
of a hydrogen proton has been described as wobbling like a spinning top. This
motion is called:: Precession
14. In comparison to Computed Axial Tomography, a disadvantage of MRI is:: -
Special and costly site planning & shielding
15. The tissue characteristic which depends more on the state (solid, liquid, gas)
of a tissue than any other factor is:: T2 effects
16. The T1 process is also known as:: Spin-Lattice
17. To describe the uniformity of the MRI system's main magnetic field, the term
employed is:: Homogeneity
1/7
, ARMRIT Practice Exam
Study online at https://quizlet.com/_flkxoa
18. The main magnetic field of MRI systems in clinical use must meet an accept-
able specification of:: 20-30 PPM
PPM: parts-per-million
19. A 90 degree radio-frequency pulse will alter the net magnetization vector.
Another effect is:: The hydrogen protons will have phase coherence
20. Which type of electromagnetic coils produce smaller magnetic fields which
allow spatial localization to be performed?: Gradient coils
21. The mechanism of T2 contrast enhancement agents is to:: Decrease T2 relaxation
time, therefore producing low signal
22. MRI systems require rooms that provide specific shielding requirements.
These rooms are lined with what type of materials?: Copper or galvanized steel
23. when is the net magnetization vector at its maximum magnitude?: At equilibrium
24. The tissue characteristic that depends heavily on the relative content of fat
molecules and free water is:: T1 effects
25. In the USA, the MRI system's main magnetic field and the vector that repre-
sents it is symbolized:: Bo
26. After a 90 degree radio-frequency pulse, the net magnetization vector be-
gins to return to equilibrium. When the NMV is half-way between transverse
and equilibrium, what are the magnitudes of the longitudinal component and
the transverse component?: Longitudinal component = greater than zero
Transverse component = greater than zero
27. Which type of electromagnetic coils can be found both inside and outside of
the housing of the MRI magnet?: Radio-frequency coils (body coils & main coil)
28. During the relaxation process, the MR signal grows weaker. The single loss
is known as:: Free Induction Decay
The FID is a damped oscillation at the resonance frequency recorded when the net magnetization is
tipped into the transverse plane
FID is elicited by a single RF pulse (e.g., 90 degrees). The FID decays with the time constant T2*. The decay of the NMR
signal can be recovered by applying a second RF pulse, a 180-degree pulse
2/7
Study online at https://quizlet.com/_flkxoa
1. The T2 process is also known as:: Spin-Spin
2. The tissue characteristic that provides more tissue contrast and pathological
information is:: T2 effects
3. The basic process of MR signal generation contains two basic steps, they
are:: Stimulation & Relaxation
4. Which statement is true of the relaxation process?: Without the effects of T2* (star), T2
decay continues
5. Which type of MRI magnet requires cryogen to cool magnetic coils to 4
degrees Kelvin?: Superconductive
6. Tissues that are very efficient at spin-lattice interactions near the Larmor
frequency, such as fatty tissues, should have: Low T1 values and produces hyperintense signals
7. Which type of electromagnetic coils are employed as a transmitter, receiver
or both?: Radio-frequency coils
8. The process of relaxation begins when:: B1 is turned off
9. To symbolize the flow and area of a magnetic field, lines are used which are
called:: Field or flux
10. Which molecule precesses closer to the Larmor frequency?: Fat
11. Which cryogenic material can produce temperature as low as 4 degrees
Kelvin?: Liquid helium
12. Magnetism can be defined as the ability of certain substances to attract:: Iron
Cobalt
Nickel
13. In a large main magnetic field such as those employed in MRI, the motion
of a hydrogen proton has been described as wobbling like a spinning top. This
motion is called:: Precession
14. In comparison to Computed Axial Tomography, a disadvantage of MRI is:: -
Special and costly site planning & shielding
15. The tissue characteristic which depends more on the state (solid, liquid, gas)
of a tissue than any other factor is:: T2 effects
16. The T1 process is also known as:: Spin-Lattice
17. To describe the uniformity of the MRI system's main magnetic field, the term
employed is:: Homogeneity
1/7
, ARMRIT Practice Exam
Study online at https://quizlet.com/_flkxoa
18. The main magnetic field of MRI systems in clinical use must meet an accept-
able specification of:: 20-30 PPM
PPM: parts-per-million
19. A 90 degree radio-frequency pulse will alter the net magnetization vector.
Another effect is:: The hydrogen protons will have phase coherence
20. Which type of electromagnetic coils produce smaller magnetic fields which
allow spatial localization to be performed?: Gradient coils
21. The mechanism of T2 contrast enhancement agents is to:: Decrease T2 relaxation
time, therefore producing low signal
22. MRI systems require rooms that provide specific shielding requirements.
These rooms are lined with what type of materials?: Copper or galvanized steel
23. when is the net magnetization vector at its maximum magnitude?: At equilibrium
24. The tissue characteristic that depends heavily on the relative content of fat
molecules and free water is:: T1 effects
25. In the USA, the MRI system's main magnetic field and the vector that repre-
sents it is symbolized:: Bo
26. After a 90 degree radio-frequency pulse, the net magnetization vector be-
gins to return to equilibrium. When the NMV is half-way between transverse
and equilibrium, what are the magnitudes of the longitudinal component and
the transverse component?: Longitudinal component = greater than zero
Transverse component = greater than zero
27. Which type of electromagnetic coils can be found both inside and outside of
the housing of the MRI magnet?: Radio-frequency coils (body coils & main coil)
28. During the relaxation process, the MR signal grows weaker. The single loss
is known as:: Free Induction Decay
The FID is a damped oscillation at the resonance frequency recorded when the net magnetization is
tipped into the transverse plane
FID is elicited by a single RF pulse (e.g., 90 degrees). The FID decays with the time constant T2*. The decay of the NMR
signal can be recovered by applying a second RF pulse, a 180-degree pulse
2/7
