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MRI MIDTERM > Magnet > Flashcards

Magnet Flashcards

1
Q

3principles types of magnet

A

Natural -Eartth
Permanent -artificially produced by changing in the field
Electromagnets- wrapped around

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2
Q

3 interaction of matter with magnet

A

Diamagnetic, Ferromagnetic, paramagnetic

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3
Q

Unaffected

A

Diamagnetic

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4
Q

Strongly attracted
Alnico an alloy of aluminum, nikel and cobalt

A

Ferromagnetic

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5
Q

Slightly attracted

A

Paramagnetic

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6
Q

The earth’s magnetic field at the equator is

A

50uT

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7
Q

The earth’s magnetic field at the poles is

A

100uT

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8
Q

Typically coil of wire through which a magnetic field is induced

A

Resistive magnet

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9
Q

Most commonly used in magnet

A

Permanent magnet

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10
Q

Alnico alloy that is used to make permanent magnet

A

Permanent magnet

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11
Q

Special coiling agent called and use produce low temperature (4k)

A

Liquid cryogen

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12
Q

Electromagnetic coils are placed in insulated chamber

A

Dewar or cryostat (contains helium)

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13
Q

The process of bringing the superconducting magnet to the temperature is called?

A

Ramping

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14
Q

Refers to magnet sudden loss

A

QUENCHING

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15
Q

High insulated bottle

A

Dewar

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16
Q

2chamber of dewar

A

Outer chamber and inner chamber

17
Q

Contain liquid nitrogen

A

Outer chamber

18
Q

Contain liquid helium

A

Inner chamber

19
Q

Quenching the process where by there is a sudden loss absolute 0of temperature
Result of helium escaping

A

Superconductor magnet

20
Q

2 Mri spin

A

Angular momentum rotation, magnet moment

21
Q

Portion of the magnetic field extending away

A

Fringe feild

22
Q

Length of the pulse determine the amount of energy given to the nuclie

A

Radio frequency pulse

23
Q

Single proton gives a

A

Large magnet moment

24
Q

7 Types of element that away MR active

A

Hydrogen, carbon, nitrogen, oxygen, fluorine, sodium, phosphorus

25
Q

Hydrogen

A

1

26
Q

carbon

A

13

27
Q

nitrogen

A

15

28
Q

oxygen

A

17

29
Q

fluorine

A

19

30
Q

sodium

A

23

31
Q

phosphorus

A

31

MRI MIDTERM (3 decks)

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