ARRT MRI registry review program Exam
Questions With Correct Answers
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 - CORRECT ANSWER✔✔-c.
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T1 relaxation refers to ____ relaxation.
| | | | |
a. spin-spin
|
b. longitudinal
|
c. phase
|
d. transverse - CORRECT ANSWER✔✔-b.
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Which of the following statements is false?
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,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 - CORRECT
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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? - CORRECT 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?
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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 - CORRECT ANSWER✔✔-a.
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Based on the graph of longitudinal relaxation shown above, which of
| | | | | | | | | | |
the following would have the brightest signal intensity on T1 image?
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a. bone marrow
| |
b. intervertebral disk
| |
c. CSF
|
d. muscle
|
(post test 1; page 1) - CORRECT ANSWER✔✔-a.
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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) - CORRECT ANSWER✔✔-a.
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, 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 - CORRECT ANSWER✔✔-
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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 - CORRECT 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?
| | | | |
Questions With Correct Answers
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 - CORRECT ANSWER✔✔-c.
| | | |
T1 relaxation refers to ____ relaxation.
| | | | |
a. spin-spin
|
b. longitudinal
|
c. phase
|
d. transverse - CORRECT 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 - CORRECT
| | | | | | | | | | | |
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? - CORRECT 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 - CORRECT 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) - CORRECT 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) - CORRECT 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 - CORRECT 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 - CORRECT 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?
| | | | |
