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MRI Physics > Unit 2 > Flashcards

Unit 2 Flashcards

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1
Q

Static Magnetic Field

A

magnetic field from that is always present (strength of the machine)

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2
Q

Fringe Magnetic field

A

edge of the static magnetic field

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3
Q

Gradient magnetic field

A

adjustable magnetic field for imaging

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4
Q

Magnetic field homogeneity

A

uniformity of the magnetic field

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5
Q

Active magnetic shielding

A

coils w/ reverse current to minimize fringe field

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6
Q

Passive magnet shielding

A

metal shielding to minimize fringe field

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7
Q

Active magnet shimming

A

coils within the machine to increase the homogeneity

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8
Q

Passive Magnet Shimming

A

metal platting in the machine to increase the homogeneity

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9
Q

Body coil

A

RF coil in the machine

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10
Q

RF coil

A

transmit and/or receive signal for imaging

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11
Q

Tranceiver

A

RF coil that transmits and receives

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12
Q

Cryogen

A

coolant used to maintain superconductivity

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13
Q

Array Processor

A

computer program used to reconstruct the image

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14
Q

Slew Rate

A

ramping up rate of gradient coils

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15
Q

Faraday Cage

A

copper cage to block out stray RF signal

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16
Q

Eddy Currents

A

induced currents in non-magnetic metals

17
Q

Gradient speed

A

time in which the gradient ramps up

18
Q

Maximum magnetic field allowed by FDA for patients >1mo

A

8T

19
Q

What metal is used for superconducting coil

A

nobium titanium

20
Q

What unit of measure is used for magnetic field homogeneity

A

ppm

21
Q

Name the conductive bands that create a gradient magnetic field

A

physical gradient

22
Q

Which direction do each of the gradients go?

A

z - w/ B0
x - left/right
y - up/down

23
Q

Name the properties used to compare gradient coil

A

gradient strength
gradient speed
Slew rate

24
Q

What is the unit of measure of the slope/peak amp?

A

G/cm

mT/m

25
Q

Types of RF coils

A

Volume - typically tranceivers
surface - typically receivers
Phased array - multiple coils used to combine the image

26
Q

Pros and cons of small RF coils

A

better SNR and penetration

small area of view

27
Q

What is the only part of the MR machine that uses AC?

A

RF transmitter coils

MRI Physics (8 decks)

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