MRSO: Exam 3
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 - ANS-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 - ANS-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. - ANS-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 - ANS-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. - ANS-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 - ANS-c. Screening process for
non-MR personnel and MR personnel should be different.
Which of the following is a true statement?
a. A level 1 or 2 personnel should be available to help a MR personnel in Zone IV in
non-emergent situations
b. All level 2 personnel are MR techs
c. A pregnant patient may not undergo an MR exam
d. A level 1 personnel may scan a patient to relieve a level 2 personnel - ANS-a. A level
1 or 2 personnel should be available to help a MR personnel in Zone IV in
non-emergent situations
Lorenz's force can be used to describe what?
a. Translation force
b. The noise heard in the MRI
c. Peripheral nerve stimulation
d. Resonance heating - ANS-b. The noise heard in the MRI
The rapids turning on & off of gradient coils causes a torque against the gantry.
A contrast media with high relaxivity will do what when compared to contrast media with
lower relativity?
a. Produce more signal
b. Produce less signal
c. Improve resolution
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 - ANS-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 - ANS-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. - ANS-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 - ANS-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. - ANS-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 - ANS-c. Screening process for
non-MR personnel and MR personnel should be different.
Which of the following is a true statement?
a. A level 1 or 2 personnel should be available to help a MR personnel in Zone IV in
non-emergent situations
b. All level 2 personnel are MR techs
c. A pregnant patient may not undergo an MR exam
d. A level 1 personnel may scan a patient to relieve a level 2 personnel - ANS-a. A level
1 or 2 personnel should be available to help a MR personnel in Zone IV in
non-emergent situations
Lorenz's force can be used to describe what?
a. Translation force
b. The noise heard in the MRI
c. Peripheral nerve stimulation
d. Resonance heating - ANS-b. The noise heard in the MRI
The rapids turning on & off of gradient coils causes a torque against the gantry.
A contrast media with high relaxivity will do what when compared to contrast media with
lower relativity?
a. Produce more signal
b. Produce less signal
c. Improve resolution
