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001 MRI > EXAM #1 — CLINICAL UNIT 1 > Flashcards

EXAM #1 — CLINICAL UNIT 1 Flashcards

1
Q
  1. Identify the largest and most powerful magnetic fields used in MRI
A

a. Primary field (a.k.a. main field or external field)

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2
Q
  1. Identify the primary hazard associated with the main magnetic field
A

a. Interaction with metallic objects

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3
Q
  1. Identify the 3 classifications of metals with respect to magnetism, in order of most affected to least affected
A

i. Ferromagnetic: strongly affected by magnetic fields
ii. Paramagnetic: weakly affected by magnetic fields
iii. Diamagnetic: weakly opposed by magnetic fields

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4
Q
  1. Identify the term used to identify the part if the magnetic field that extends beyond the magnet housing
A

a. Fringe field, follows inverse square law for intensity

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5
Q
  1. Identify the danger associated with ferromagnetic objects in the magnetic field
A

a. Become projectiles, ferromagnetic objects can also be dangerous because they will accelerate toward the magnet at greater speeds than large objects (become projectiles) via attraction

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6
Q
  1. Identify the term used to describe a paramagnetic object being moved by the magnetic field
A

a. Deflection, rather than being attracted to the magnetic field, it is said that paramagnetic objects are deflected by the field (turning and twisting)

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7
Q
  1. Identify areas of the body where metallic foreign bodies are most dangerous when exposed to the main magnetic field
A

a. Brain, eyes, heart, major arteries, veins, or nerves

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8
Q
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    a. Cardiac pacemakers
A
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    a. Cardiac pacemakers
    i. Not safe (deflection, induction of electrical currents, implant malfunction)
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9
Q
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    b. Prosthetic heart valves
A
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    b. Prosthetic heart valves
    i. Safe
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10
Q
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    c. Surgical clips in the chest, abdomen, or pelvis
A
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    c. Surgical clips in the chest, abdomen, or pelvis
    i. Safe
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11
Q
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    d. Vascular clips in the brain
A
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    d. Vascular clips in the brain
    i. Safe but older models will deflect
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12
Q
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    e. Intravascular coils, filters, and stents
A
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    e. Intravascular coils, filters, and stents
    i. Safe
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13
Q
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    f. Metal that is fixed to a bone
A
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    f. Metal that is fixed to a bone
    i. Safe
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14
Q
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    g. Internal cardiac pacemakers
A
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    g. Internal cardiac pacemakers
    i. Not safe (induction of electrical current, implant malfunction)
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15
Q
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    h. Internal neurostimulators
A
  1. Discuss the potential dangers associated with the following implants (deflection, induction of electrical currents, implant malfunction, etc.):
    h. Internal neurostimulators
    i. Not safe (Induction of electrical current)
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16
Q
  1. Define “exclusion zone”
A
  1. Define “exclusion zone”
    a. Area in which the static magnetic field will interfere with electrically, magnetically, or mechanically activated devices
    b. Area within 5 Gauss line (0.0005 T), the area around an MRI magnet wherein the magnetic field is strong enough to interfere with medical devices (electrically, magnetically, or mechanically activated devices)
17
Q
  1. Identify the type of MRI primary magnet that has the strongest main magnetic field and fringe field
A
  1. Identify the type of MRI primary magnet that has the strongest main magnetic field and fringe field
    a. Superconducting electromagnet
18
Q
  1. Identify the only type of MRI primary magnet that can be switched off when not in use
A
  1. Identify the only type of MRI primary magnet that can be switched off when not in use
    a. Resistive electromagnet
19
Q
  1. Identify the primary safety hazard associated with the secondary magnetic fields
A
  1. Identify the primary safety hazard associated with the secondary magnetic fields
    a. Induction of current into a conductor
20
Q
  1. Explain the first action to be taken in the event of a medical emergency in the magnet room
A
  1. Explain the first action to be taken in the event of a medical emergency in the magnet room
    a. Remove the patient from the magnet room
21
Q
  1. Explain the only instance in which a technologist should quench a superconducting electromagnet
A
  1. Explain the only instance in which a technologist should quench a superconducting electromagnet
    a. Immediate danger of personal injury
22
Q
  1. Explain where a person should position themselves if trapped in a magnet room during a magnet superconducting magnet quench if the gases vent into the room
A
  1. Explain where a person should position themselves if trapped in a magnet room during a magnet superconducting magnet quench if the gases vent into the room
    a. Near the floor
23
Q
  1. Explain the action to be taken if a patient is trapped in a magnet room into which cryogenic gases are venting
A
  1. Explain the action to be taken if a patient is trapped in a magnet room into which cryogenic gases are venting
    a. Gain access to the room as quickly as possible
24
Q
  1. Identify the only people who should handle cryogenic liquids
A
  1. Identify the only people who should handle cryogenic liquids
    a. Trained service personnel
25
Q
  1. Identify a hazard associated with cryogenic liquids
A
  1. Identify a hazard associated with cryogenic liquids

a. Frostbite

26
Q
  1. Explain the first actions to be taken in the event of a small fire in the magnet room
A
  1. Explain the first actions to be taken in the event of a small fire in the magnet room
    a. Evacuate patient, turn off electricity to magnet, stay as near as possible to assure magnet safety of fire-fighting personnel
27
Q
  1. Explain the first actions to be taken in the event of a large fire in the magnet room
A
  1. Explain the first actions to be taken in the event of a large fire in the magnet room
    a. Evacuate patient, and quench the magnet

001 MRI (15 decks)

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