Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

MRI Physics > Imaging Weighting and Contrast > Flashcards

Imaging Weighting and Contrast Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

What are the intrinsic parameters that cannot be changed?

A
  1. T1 recovery time
  2. T2 decay time
  3. Proton Density
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the extrinsic parameters that can be changed?

A
  1. TR
  2. TE
  3. Flip Angle
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What occurs at 1/2 the echo time?

A

180 degree refocusing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How is T1 weighting achieved?

A

short TR
short TE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How is T2 weighting achieved?

A

long TR
long TE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How is PD weighting achieved?

A

long TR
short TE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

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

A

T2 weighted spin echo

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

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

A

Proton Density weighted spin echo

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Where is all the echoes stored in?

A

k-space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

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

A

GRE T1 weighting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

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

A

GRE T2* weighting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Which sequence is susceptible to local magnetic field inhomogeneity?

A

gradient echo (GRE) T2*

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Fat or Water shows up bright in T1?

A

Fat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Fat or Water shows up dark in T2?

A

Fat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions