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MRI Physics > Imaging Weighting and Contrast > Flashcards

Imaging Weighting and Contrast Flashcards

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1
Q

What are the intrinsic parameters that cannot be changed?

A
  1. T1 recovery time
  2. T2 decay time
  3. Proton Density
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2
Q

What are the extrinsic parameters that can be changed?

A
  1. TR
  2. TE
  3. Flip Angle
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3
Q

What occurs at 1/2 the echo time?

A

180 degree refocusing

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4
Q

How is T1 weighting achieved?

A

short TR
short TE

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5
Q

How is T2 weighting achieved?

A

long TR
long TE

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6
Q

How is PD weighting achieved?

A

long TR
short TE

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7
Q

Short TR 350-800 ms
Short TE 0-25 ms
90-degree flip angle
180-degree refocus pulse

A

T1 weighted spin echo

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8
Q

Long TR >2500ms
Long TE 80-120 ms
90-degree flip angle
180-degree refocus pulse

A

T2 weighted spin echo

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9
Q

Long TR >2500ms
Short TE 0-25 ms
90-degree flip angle
180-degree refocus pulse

A

Proton Density weighted spin echo

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10
Q

Where is all the echoes stored in?

A

k-space

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11
Q

Short TR <800 ms
Min TE 0-5 ms
Flip Angle 70-90 degree

A

GRE T1 weighting

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12
Q

Short TR <800 ms
TE 20-40 ms
Flip Angle 5-25 degree

A

GRE T2* weighting

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13
Q

Which sequence is susceptible to local magnetic field inhomogeneity?

A

gradient echo (GRE) T2*

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14
Q

Fat or Water shows up bright in T1?

A

Fat

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15
Q

Fat or Water shows up dark in T2?

A

Fat

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16
Q

What doesn’t affect the contrast?

A

thickness of tissue

17
Q

Fat or Water has higher proton density?

A

Fat

18
Q

What is the most important factor in GRE sequence

A

flip angle

19
Q

What is the process that flips protons through the transverse plane, catches up and creates an echo?

A

180 degree refocusing

20
Q

Which weighting can never be in GRE echo pulse sequence?

A

true T2

21
Q

Dark or Bright in T1 weighted: long T1 recovery?

A

dark

22
Q

Dark or Bright in T2 weighted: short decay in transverse plane?

A

dark

23
Q

What does more current create?

A

it creates steeper gradient field

MRI Physics (8 decks)

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