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MRI Scan Principles Q > image contrast/weighting > Flashcards

image contrast/weighting Flashcards

1
Q

: A sequence with a _________ TR and a _________ TE will exhibit T1 weighting

A

short; short

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2
Q

Which of the following statements is TRUE regarding spin echo sequences

A

T1 contrast is maximized with short TR’s

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3
Q

What is wrong with a T2 weighted, fast spin echo image that has a 1.1 second TR and an 90 millisecond TE?

A

The TR does not sufficiently minimize the T1 weighted contrast

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4
Q

Tissues with _______ are bright on T1 weighted spin echo scans and tissues with _________ are bright on T2 weighted spin echo scans

A

short T1 times; long T2 times

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5
Q

Enabling Driven Equilibrium will enable the operator to:

A

Reduce TR and preserve contrast

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6
Q

What determines the amount of T2 weighting in an image

A

TE

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7
Q

What determines the amount of T1 weighting in an image

A

TR

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8
Q

To produce an image based on differences in T1, the time interval between 90° excitation pulses should be:

A

Short

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9
Q

A sequence with a _________ TR and a _________ TE will exhibit PD weighting

A

Long; short

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10
Q

: A sequence with a _________ TR and a _________ TE will exhibit T2 weighting

A

Long; long

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11
Q

A T2 weighted image will have a repetition time (TR) in the range of

A

2000 - 6000 ms

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12
Q

A T2 weighted image will have an echo time (TE) in the range of:

A

80 - 120 ms

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13
Q

A T1 weighted image will have a repetition time (TR) in the range of

A

350 - 700 ms

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14
Q

A T1 weighted image will have an echo time (TE) in the range of:

A

10 - 30 ms

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15
Q

A proton density weighted image will have a repetition time (TR) in the range of:

A

1600 - 4000 ms

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16
Q

A proton density weighted image will have an echo time (TE) in the range of:

A

10 - 35 ms

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17
Q

Water is dark and fat is bright in

A

T1 weighted images

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18
Q

Which of the following parameter combinations would yield the most T2 weighted image?

A. 500 TR, 20 TE
B. 1600 TR, 30 TE
C. 2000 TR, 80 TE
D. 3500 TR, 120 TE

A

3500 TR, 120 TE

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19
Q

Which of the following parameter combinations would yield the most T1 weighting?

A. 350 TR, 15 TE
B. 500 TR, 25 TE
C. 1600 TR, 30 TE
D. 3500 TR, 120 TE

A

350 TR, 15 TE

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20
Q

Which of the following statements is FALSE

A

T1 weighting is adjusted with short TE’s

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21
Q

Water is hyperintense and fat is typically dark in

A

T2 weighted images

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22
Q

All of the following are properties of T1 weighting EXCEPT:

A

Transverse magnetization

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23
Q

All of the following are properties of T2 weighting EXCEPT

A

Flip angle controls contrast

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24
Q

All of the following are true EXCEPT

A

Gradient echo — 90° RF followed by 180° RF

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25
Q

T1 is useful for __________, whereas T2 is utilized for depicting

A

Anatomy; pathology

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26
Q

All of the following are examples of INTRINSIC contrast parameters in tissues EXCEPT:

A

TR

27
Q

All of the following are examples of EXTRINSIC contrast parameters EXCEPT:

A

T1 time

28
Q

Structures that will always appear black on an MR image include all of the following EXCEPT:

A

CSF

29
Q

Presaturation pulses typically occur

A

Prior to the excitation pulse

30
Q

Increasing the TE in a spin echo pulse sequence

A

Enables more T2 information in the image

31
Q

In an inversion recovery sequence, image contrast is controlled by

A. TR
B. TE
C. TI
D. All of the above

A

All of the above

32
Q

Chemical or spectral fat suppression techniques suppress fat signal based on the:

A

Precessional frequency of fat

33
Q

Which of the following sets of parameters would show edema as hyperintense

A

4000 TR, 90 TE

34
Q

As the TR increases the amount of T1 weighted contrast ___________.

A

Decreases

35
Q

A Proton Density weighted image has a TR that is long to _____________, and a TE that is short to _____

A

Minimize T1 contrast; minimize T2 contrast

36
Q

Column A in Image 105 corresponds to which MRI pulse sequence

A

T1 weighted

37
Q

Column B in Image 105 corresponds to which MRI pulse sequence

A

Proton density

38
Q

Column C in Image 105 corresponds to which MRI pulse sequence

A

Proton density with fat suppression

39
Q

Column D in Image 105 corresponds to which MRI pulse sequence

A

T2 weighted

40
Q

Column A in Image 106 corresponds to which MRI pulse sequence

A

T2 weighted

41
Q

Column B in Image 106 corresponds to which MRI pulse sequence

A

T1 weighted

42
Q

Column C in Image 106 corresponds to which MRI pulse sequence

A

Proton density

43
Q

Column D in Image 106 corresponds to which MRI pulse sequence

A

STIR

44
Q

Column A in Image 107 corresponds to which MRI pulse sequence?

A

T2 weighted

45
Q

Column C in Image 107 corresponds to which MRI pulse sequence

A

Proton density

46
Q

Column D in Image 107 corresponds to which MRI pulse sequence?

A

STIR

47
Q

Column A in Image 108 corresponds to which MRI pulse sequence?

A

T2 weighted

48
Q

Column B in Image 108 corresponds to which MRI pulse sequence

A

T1 weighted

49
Q

Column C in Image 108 corresponds to which MRI pulse sequence

A

Proton density

50
Q

Column D in Image 108 corresponds to which MRI pulse sequence

A

T2 weighted with fat suppression

51
Q

Column A in Image 109 corresponds to which MRI pulse sequence?

A

T2 weighted

52
Q

Column B in Image 109 corresponds to which MRI pulse sequence

A

T1 weighted

53
Q

Column C in Image 109 corresponds to which MRI pulse sequence

A

Proton density

54
Q

Column D in Image 109 corresponds to which MRI pulse sequence

A

T2 weighted with fat suppression

55
Q

Column A in Image 111 corresponds to which MRI pulse sequence

A

T2 weighted

56
Q

Column B in Image 111 corresponds to which MRI pulse sequence

A

Proton density

57
Q

Column C in Image 111 corresponds to which MRI pulse sequence

A

T1 weighted

58
Q

Column D in Image 111 corresponds to which MRI pulse sequence?

A

T2 FLAIR

59
Q

Column A in Image 112 corresponds to which MRI pulse sequence?

A

T2 weighted

60
Q

Column C in Image 112 corresponds to which MRI pulse sequence

A

T1 weighted

61
Q

Column D in Image 112 corresponds to which MRI pulse sequence

A

T2 FLAIR

62
Q

Which column in Image 113 would be best suited for evaluation of demyelinating disease?

A

Column D

63
Q

Which sequence’s column in Image 113 would be repeated following the administration of a GBCA (gadolinium based contrast agent)?

A

Column C

64
Q

Column B in Image 112 corresponds to which MRI pulse sequence?

A

Proton density

MRI Scan Principles Q (6 decks)

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