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MRI Physics > Basic Principles > Flashcards

Basic Principles Flashcards

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1
Q

How often should the cryogen level be checked?

A

daily

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2
Q

What is the best imaging modality for soft tissue?

A

Magnetic Resonance Imaging

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3
Q

Which imaging modality uses ionizing radiation, cross-sectional, from multiple points of view?

A

CT

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4
Q

Why would MRI be used instead of X-ray or CT?

A

MRI generates a large variety of contrast

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5
Q

Who develops the law of magnet induction?

A

Faraday

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6
Q

Which imaging modality uses ionizing radiation?

A

x-ray

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7
Q

Who develops the first magnet?

A

Damadian

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8
Q

What creates all the noise?

A

gradients (Lauterbur)

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9
Q

What is the main magnet’s issue?

A

projectiles

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10
Q

What is the most commonly used imaging modality?

A

x-ray

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11
Q

What is PET?

A

a medical imaging procedure that uses a radioactive isotope attached to glucose

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12
Q

What is RF’s main issue?

A

burns

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13
Q

What does a moving/changing magnetic create?

A

current conductor

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14
Q

Which imaging modality uses transducer on patient’s?

A

ultrasound

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15
Q

When do MRI tech press the “quench” button?

A

only when it’s life or death

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16
Q

What do MRI tech do when there’s natural disaster?

A

turn off the power, not “quench”

17
Q

Who regulates medical meds and machines?

A

FDA

18
Q

What do MRI tech do when there’s flood/electrical fire?

A

press emergency button

19
Q

What happens when the patient is having cardiac arrest on the MRI table?

A

get them out first

20
Q

Why would CT be used instead of MRI?

A

it’s fast, best for blood vessels

21
Q

Does the RF have ionizing radiation?

A

no. it has non-ionizing radiation

22
Q

What is the fringe field in the context of MRI?

A

the stray magnetic field outside the bore of the magnet.

23
Q

What can the fringe field do?

A

pull ferromagnetic objects

24
Q

How many protons does hydrogen have?

A

1 proton

25
Q

How many neutrons does hydrogen have?

A

0

26
Q

How many electrons does hydrogen have?

A

1

27
Q

What is the basic hydrogen atom - a single proton circled by a single electron?

A

protium

28
Q

What is it called when an atom has same number of protons but different number or neutrons?

A

isotope

MRI Physics (8 decks)

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