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MRSO: Exam 3 Questions & Correct Revised Verified Answers
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MRSO: Exam 3 Questions & CorrectRevised Verified Answers
Parallel imaging will collect multiple lines of K space per each coil element. This reduces
heating. The number of TR we need depends on the number of phase encoding lines
that need to be filled in our K space. That means we need to deliver more RF pulses to
fill more lines of K space. By reducing our phase encoding, we can reduce heating. If we
increase the slices we need to collect, we will need to fill more K spaces. This means
that more RF pulses are delivered during each TR. A phase encoding line is filled after
every one of these 180 degree RF refocusing pulses.
When discussing the distance from an RF transmitter and the biological effects
witnessed, which of the following describes the area where the most energy is
absorbed in implants?
a. Danger zone
b. MR table
c. Near field
d. Patient's abdomen - Answer c. Near field
Which of the following are responsible for testing the safety of implants?
a. EPA
b. HIPPA
,c. FDA
d. ASTM - Answer d. ASTM
Which of the following are physiologic factors that occur from an anaphylactic reaction?
Select all that apply.
a. Elevated creatinine levels
b. Vasodilation
c. Bronchial smooth muscle contraction
d. Increased vascular permeability - Answer b, c, d
A non-emergent quench can take approximately how long?
a. 1 minute
b. 20 seconds
c. 5-15 mins
d. 2- 4 mins - Answer c. 5-15 mins
An emergent quench will take approximately 1 minute.
The roaring sound heard during a quench is caused by what?
a. The sound of the ignition of the coils of wire used to heat the cryogen b.
The massive volume of helium boiling off through the quench vent
c. If a loud noise is heard, something is going wrong and you should evacuate.
d. The sound of the system shutting down. - Answer b. The massive volume of helium
boiling off through the quench vent
, Which of the following will reduce the risk of patient burning in a pacing wire?
a. Place pacing wire outside RF field
b. Advance patient into scanner head first
c. Don't scan patient
d. Place an ice pack on patient's chest - Answer a. Place pacing wire outside RF field
A patient has removed a vagus stimulator with the leads left in, and is having a MR knee
performed with the transmit-receive coil. In terms of patient heating, is it safe to scan?
a. No
b. Yes, only with heat sink
c. Yes
d. Yes, only if that patient is less than 200lb. - Answer c. Yes
Heating can only occur in areas where RF energy is exposed to. If the implant is
not exposed to RF energy, heating will not occur.
Which of the following are NOT true?
a. Screening process for non-MR personnel and MR personnel should be the same
b. Unscreened patients should not enter Zone III
c. Screening process for non-MR personnel and MR personnel should be different.
d. Zone IV is the responsibility of Level 2 personnel - Answer c. Screening process for
non-MR personnel and MR personnel should be different.
Which of the following is a true statement?
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