QUESTIONS AND VERIFIED ANSWERS|NEWEST
Question 1
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.
Question 2
T1 relaxation refers to ____ relaxation.
a. spin-spin
b. longitudinal
c. phase
d. transverse
CORRECT ANSWER
b.
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,Question 3
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.
Question 4
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
Question 5
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.
Question 6
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.
Question 7
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
3
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, d. muscle
(post test 1; page 1)
CORRECT ANSWER
a.
Question 8
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.
Question 9
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.
4
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Question 1
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.
Question 2
T1 relaxation refers to ____ relaxation.
a. spin-spin
b. longitudinal
c. phase
d. transverse
CORRECT ANSWER
b.
1
@THE STUDY VAULT
,Question 3
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.
Question 4
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
Question 5
Which of the following is the definition of T1 relaxation?
2
@THE STUDY VAULT
,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.
Question 6
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.
Question 7
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
3
@THE STUDY VAULT
, d. muscle
(post test 1; page 1)
CORRECT ANSWER
a.
Question 8
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.
Question 9
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.
4
@THE STUDY VAULT
