Exam (elaborations)
MRSO EXAM 2 QUESTIONS AND ANSWERS
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MRSO EXAM 2 QUESTIONS AND ANSWERS
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Name: Score:67 Multiple choice questions
Term 1 of 67
What types of cryogen are used in a duel cryogen system?
Helium and hydrogen
Helium and nitrogen
Helium and carbon dioxide
Helium and oxygen
Term 2 of 67
Which of the following mechanisms of patient burning is associated with the antenna effect?
Resonant circuitry
Ferrous induction
Proximity burning
Far field
Term 3 of 67
What is the ICNIRP occupational workers dose magnetic flux limit for the extremities?
14 Tesla
400 mT
2 Tesla
8 Tesla
,Term 4 of 67
What is the ICNIRP occupational workers dose for magnetic flux limit for the head and torso?
2 Tesla
14 Tesla
400 milliTesla
8 Tesla
Term 5 of 67
This individual must understand the risks associated with the MRI environment:
Level 2 personnel
Level 1 personnel
The patient
Non-MR personnel
Term 6 of 67
What are the reasons we would quench an MR unit? Select all that apply.
a. Large ferrous object is pinning a patient
b. Fire in MRI room
c. Code blue
d. At the end of a shift
a, b
b, d
d. EPI
c, d
,Term 7 of 67
A ligand that attaches a gad ion in a chain-like molecule is called what?
Captured
Polarized
Macrocyclic
Linear
Term 8 of 67
Which of the following techniques can be used to increase the echo spacing? Select all that
apply.
a. Increase the TR
b. Decrease receiving bandwidth
c. Increase receiving bandwidth
d. Use a receive only coil
e. Increase field of view
f. Increase flip angle
a. Increasing the echo train length (will add more 180 degree refocusing pulses to our
spin echo sequence within each TR.)
a, b, c
d. All will cause artifact in our image
3 types of stainless steel:
Austenitic: non-ferrous that is most commonly used.
Ferritic: ferrous metal; not common
Martensitic: ferrous metal used in medicine. High levels of carbon and can be tempered.
Resistant to corrosion.
b, e
Decreasing the receiving bandwidth will be lengthening the sample time. This may force
us to increase our TE as well as the TR. Increasing the field of view will also allow for
longer echo spacing.
, Term 9 of 67
Which of the following are mechanisms of patient burning in MRI due to the RF transmitter?
Select all that apply.
a. Resonant circuitry
b. Micro Metal effect
c. Electrical conductivity
d. Near field effects
a, c, d
Near field effects will cause proximity burns. Resonant circuitry will cause burning in
insulated wires in or on a patient. This includes the antenna effect. Electrical conductivity
is caused when a coil touches a patient.
c. RF and changing gradient magnetic field
The RF is an oscillating magnetic field transmitted at a specific frequency. The changing
gradient magnetic field is produced from the gradient coils and will produce a strong
magnetic field on one side of the patient and a weak magnetic field on the other side of
the patient.
a, c, d
Contrast media has been detected across the blood/placenta barrier.
b, e
Decreasing the receiving bandwidth will be lengthening the sample time. This may force
us to increase our TE as well as the TR. Increasing the field of view will also allow for
longer echo spacing.
Term 10 of 67
Which of the following are true? Select all the correct answers.
MRI promotes female offspring in working MR technologists
MRI can cause infertility
None
MRI has been associated with teratogenesis
MRI can cause an increase in spontaneous abortion
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