MRSO updated Exam with correct detailed solutions
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Peripheral nerve stimulation can be described by which of the following?
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a. Faraday's law of induction
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b. Ohm's law
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c. Lenz's law
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d. Planks Law - correct answer✔✔b. Faraday's law of induction (describes the induction of
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electrical current in the presence of a changing magnetic field).
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Lenz's force describes the opposing forces created.
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Ohm's law deals with the resistance of current along a wire.
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Gad contrast has been found in the body in what form? Select all that apply.
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a. Water-soluble
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b. Non-water soluble - correct answer✔✔a, b
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Which of the following would we expect to be the loudest sequence?
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a. GRASS
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b. Fast spin echo
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c. Conventional gradient sequence
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d. FLAIR - correct answer✔✔a. GRASS
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The FLAIR and fast spin echo are considered spin echo sequences; they do not have
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extremely fast changing gradient, so will not produce as much noise.
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,Which of the following has a steeper spatial magnetic gradient?
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a. Vertical B0
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b. Horizontal B0 - correct answer✔✔a. Vertical B0
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The strongest gradient strength will reach maximum strength how far from isocenter?
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a. 5-20 cm
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b. 20-40 cm
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c. 30-60 cm
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d. 5-15 cm - correct answer✔✔c. 30-60 cm
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Which of the following is true of gad and breastfeeding mothers? Select all that apply.
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a. Gad is found in breast milk in a stable and chelated form
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b. It is thought that gad contrast may alter the taste of breastmilk.
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c. Available data suggests that breastmilk should be pumped and discarded for 24 hours
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after the IV dose
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d. 20% of the intravascular dose would be excreted into the breastmilk within the first 24
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hours. - correct answer✔✔a, b
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Which of the following will influence peripheral nerve stimulation?
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a. Static magnetic field
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b. Magnetic field at isocenter
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c. Patient weight
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d. Slew rate - correct answer✔✔d. Slew rate
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, Which of the following pulse sequences would we expect to see the least patient heating?
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a. Incoherent gradient
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b. STIR
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c. Fast spin echo
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d. EPI - correct answer✔✔d. EPI
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A patient comes in with a 1 cm brain aneurysm clip and you find the package which lists
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what metal it is made from. Which of the following metals would make it unsafe to scan
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this patient?
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a. Elgiloy
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b. Phynox
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c. MP35N
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d. 405 Stainless steel - correct answer✔✔d. 405 Stainless steel
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Phynox, elgiloy, titanium, and 316 stainless steel are non-ferrous.
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17-7PH and 405 stainless steel are ferrous
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Which of the following are true of Lenz's force?
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a. Occurs because of the interaction between a ferrous object and the static magnetic field
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b. Influences objects that are electrically conductive
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c. Influence on an object depends on the field strength
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d. Increases with the rate of motion through the static magnetic field. - correct answer✔✔b,
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c, d
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Peripheral nerve stimulation can be described by which of the following?
|| || || || || || || || || ||
a. Faraday's law of induction
|| || || ||
b. Ohm's law
|| ||
c. Lenz's law
|| ||
d. Planks Law - correct answer✔✔b. Faraday's law of induction (describes the induction of
|| || || || || || || || || || || || || ||
electrical current in the presence of a changing magnetic field).
|| || || || || || || || ||
Lenz's force describes the opposing forces created.
|| || || || || ||
Ohm's law deals with the resistance of current along a wire.
|| || || || || || || || || ||
Gad contrast has been found in the body in what form? Select all that apply.
|| || || || || || || || || || || || || ||
a. Water-soluble
||
b. Non-water soluble - correct answer✔✔a, b
|| || || || || ||
Which of the following would we expect to be the loudest sequence?
|| || || || || || || || || || ||
a. GRASS
||
b. Fast spin echo
|| || ||
c. Conventional gradient sequence
|| || ||
d. FLAIR - correct answer✔✔a. GRASS
|| || || || ||
The FLAIR and fast spin echo are considered spin echo sequences; they do not have
|| || || || || || || || || || || || || || ||
extremely fast changing gradient, so will not produce as much noise.
|| || || || || || || || || ||
,Which of the following has a steeper spatial magnetic gradient?
|| || || || || || || || ||
a. Vertical B0
|| ||
b. Horizontal B0 - correct answer✔✔a. Vertical B0
|| || || || || || ||
The strongest gradient strength will reach maximum strength how far from isocenter?
|| || || || || || || || || || ||
a. 5-20 cm
|| ||
b. 20-40 cm
|| ||
c. 30-60 cm
|| ||
d. 5-15 cm - correct answer✔✔c. 30-60 cm
|| || || || || || ||
Which of the following is true of gad and breastfeeding mothers? Select all that apply.
|| || || || || || || || || || || || || ||
a. Gad is found in breast milk in a stable and chelated form
|| || || || || || || || || || || ||
b. It is thought that gad contrast may alter the taste of breastmilk.
|| || || || || || || || || || || ||
c. Available data suggests that breastmilk should be pumped and discarded for 24 hours
|| || || || || || || || || || || || || ||
after the IV dose
|| || ||
d. 20% of the intravascular dose would be excreted into the breastmilk within the first 24
|| || || || || || || || || || || || || || || ||
hours. - correct answer✔✔a, b
|| || || ||
Which of the following will influence peripheral nerve stimulation?
|| || || || || || || ||
a. Static magnetic field
|| || ||
b. Magnetic field at isocenter
|| || || ||
c. Patient weight
|| ||
d. Slew rate - correct answer✔✔d. Slew rate
|| || || || || || ||
, Which of the following pulse sequences would we expect to see the least patient heating?
|| || || || || || || || || || || || || ||
a. Incoherent gradient
|| ||
b. STIR
||
c. Fast spin echo
|| || ||
d. EPI - correct answer✔✔d. EPI
|| || || || ||
A patient comes in with a 1 cm brain aneurysm clip and you find the package which lists
|| || || || || || || || || || || || || || || || || ||
what metal it is made from. Which of the following metals would make it unsafe to scan
|| || || || || || || || || || || || || || || || ||
this patient?
||
a. Elgiloy
||
b. Phynox
||
c. MP35N
||
d. 405 Stainless steel - correct answer✔✔d. 405 Stainless steel
|| || || || || || || || ||
Phynox, elgiloy, titanium, and 316 stainless steel are non-ferrous.
|| || || || || || || ||
17-7PH and 405 stainless steel are ferrous
|| || || || || ||
Which of the following are true of Lenz's force?
|| || || || || || || ||
a. Occurs because of the interaction between a ferrous object and the static magnetic field
|| || || || || || || || || || || || || ||
b. Influences objects that are electrically conductive
|| || || || || ||
c. Influence on an object depends on the field strength
|| || || || || || || || ||
d. Increases with the rate of motion through the static magnetic field. - correct answer✔✔b,
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c, d
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