ARRT review - MRI registry review program 396 Questions with Updated & UPDATE

ARRT review - MRI registry review program 396 Questions with Answers Updated & 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 - ✔✔c.
T1 relaxation refers to ____ relaxation.
a. spin-spin
b. longitudinal
c. phase
d. transverse - ✔✔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 - ✔✔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? - ✔✔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 - ✔✔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) - ✔✔a.