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MRI > Part II > Flashcards

Part II Flashcards

1
Q

MRI basic principles [requirements]

A

Magnetic field (Mo) of hydrogen atoms
magnetic field (Bo) off the gradient coils
radio frequency by the RF coils
Added magnetic field by outer magnets

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2
Q

Precession is due to [..]

A

Angular momentum

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3
Q

The orientation of Z plane follows the orientation of the [..]

A

Bo

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4
Q

Spin of the nucleus, counterclockwise, reason for procession

A

Angular momentum

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5
Q

[M] Ideally all proton would line up the same orientation because of the [..] of the nucleus

A

Thermal motion

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6
Q

[M] At [..] approximately one proton in every million protons will be aligned with the magnetic field. Where are the rest cancel out

A

Room temperature

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7
Q

Resonance

A

Property to respond to Larmour frequency
Property of the precessing nucleus in which it absorbs energy

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8
Q

Degree of radio frequency is applied, and protons are flipped towards the transverse plane

A

90 to 180°

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9
Q

The longer introduction of RF [..], the shorter introduction of RF [..]

A

Better
Blurred

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10
Q

The energy collected by RF coils

A

Free induction decay

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11
Q

Strength of FID = [..]

A

Area of Mxy

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12
Q

Increase in FID = [..]

A

Increase brightness (hyperintense)

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13
Q

Connected to computer system to convert signals to pulses

A

RF coils

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14
Q

Movement of proton in nucleus

A

Proton density

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15
Q

Concentration of H atoms

A

Spin density

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16
Q

Identifies the tone of the tissue

A

Spin density

17
Q

Spin density of muscles and white matter

A

100

18
Q

Spin density of fat

A

98

19
Q

Spin density of CSF

A

96

20
Q

Spin density of kidney

A

95

21
Q

Spin density of gray matter

A

94

22
Q

Spin density of spleen

A

92

23
Q

Spin density of liver

A

91

24
Q

Spin density of blood

A

90

25
Q

Spin density of pancreas

A

86

26
Q

Spin density of cortical bone

A

1 to 10

27
Q

Spin density of lungs

A

1-5

28
Q

Spin density of air

A

<1

29
Q

Most used particle in MRI, one proton is its nucleus

A

Protium

30
Q

One proton, one neutron

A

Deotirium

31
Q

Three particles, two neutron one proton

A

Tritium

32
Q

Image formation of conventional radiation

A

Expose – transmit/absorption – IR

33
Q

Image formation of CT

A

Expose – transmit/absorb – detectors

34
Q

Image formation of MRI

A

Expose – absorb– release – RF coils

35
Q

Advantages of MRI

A

Tissue contrast – hi did you mean by signals received
Information content of MR image - range of pathology may be identified
Sensitivity and specificity -high spatial resolution
Energy -non ionizing

MRI (7 decks)

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