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ARRT review - MRI registry review program questions with verified solutions 2025 latet update.
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ARRT review - MRI registry review program questions with verified solutions 2025 latet update.
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ARRT review - MRI registry reviewprogram questions with verified
solutions 2025 lateSt update
An RF pulse of what flip angle will maximize the component of the net
magnetization projected into the transverse plane?
a. 180
b. 120
c. 90
d. 45 - answer c.
T1 relaxation refers to ____ relaxation.
a. spin-spin
b. longitudinal
c. phase
d. transverse - answer b.
Which of the following statements is false?
a. T1 relaxation refers to longitudinal recovery of magnetization while T2
relaxation refers to the transverse decay of magnetization
b. T1 relaxation and T2 relaxation occur simultaneously
c. echoes collected in the transverse plane demonstrate only T2 relaxation
differences
d. T2 relaxation occurs much more quickly than T1 relaxation - answer c.
,If the precessional frequency of the patient's protons is approximately 21
MHz, what magnetic field strength is being experienced by the patients
protons? - answer Larmor frequency equation
W0= B0 x Y
21= 42.6 x (X)
21/42.6 = .4929 (round) = 0.5T
Which of the following is the definition of T1 relaxation?
a. the time is takes the net longitudinal magnetization of protons to grow
63% of its final amplitude
b. the time at which is takes the transverse magnetization has decayed
63% of its full value - answer a.
Based on the graph of longitudinal relaxation shown above, which of the
following would have the brightest signal intensity on T1 image?
a. bone marrow
b. intervertebral disk
c. CSF
d. muscle
(post test 1; page 1) - answer a.
Based on the graph of longitudinal relaxation shown above, which of the
following would have the shortest T1 relaxation time?
a. bone marrow
b. intervertebral disk
,c. CSF
d. muscle
(post test 1; page 1) - answer a.
The edema associated with pathology in the brain has a much longer T2
relaxation time than surrounding normal brain tissue. On a T2 image, what
does this result in?
a. isointense between edema and surrounding normal brain tissue
b. a low signal intensity in the area of edema
c. a signal void in the area of edema
d. a high signal intensity in the area of edema - answer d.
Which of the following dephasing mechanisms affects the size of the
resulting spin echo?
a. magnetic field inhomogenities
b. phase effects of chemical shift
c. magnetic susceptibility
d. spin-spin interactions - answer d.
After a 90 RF pulse, if three 180 RF pulses are applied to generate three
echoes, which of the following is responsible for the third echo being
much smaller than the first echo?
a. magnetic field inhomogenities
b. phase effects of chemical shift
c. magnetic susceptibility
d. spin-spin interactions - answer d.
, The MR echo is NOT:
a. detected as magnetic changes that induce voltage into an RF coil
b. collected when the magnetization in the transverse plane has been
rephased
c. a tiny signal containing contrast info. necessary for tissue
differentiation
d. collected only one time for a given image - answer d.
What is the time from the initial RF excitation pulse to the echo called?
a. TE
b. TI
c. TM
d. TR - answer a.
The proton's ____ contributes to its magnetic properties.
1. spinning motion
2. positive change
3. mass - answer 1. and 2.
Which of the following is TRUE regarding the hydrogen protons in a
patient's body when placed in the magnet of an MR system?
a. more protons align with the main magnetic field than against the main
magnetic field
b. more protons align against the main magnetic field than with the main
magnetic field
c. equal numbers of protons align against the main magnetic field
d. all of the protons line up perpendicular to the main magnetic field -
answer a.
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