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MRI QUIZ > MRI Parameters > Flashcards

MRI Parameters Flashcards

1
Q

If we increase the TR, what will this do to the scan time?

A

Increase

increased tr increased scan time

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2
Q

If we increase the TR, what will this do to the signal to noise ratio?

A

increase

increase TR increase SNR

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3
Q

What affect does increasing or decreasing the TR do to the effect on detail?

A

UNCHANGED

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4
Q

If we increase the TR, what will this do to the SAR?

A

Decreases

increase TR decreases SAR
inversely related

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5
Q

When you increase the TR, does this increase or decrease the T1 weighting?

A

increasing TR decreases the T1 Weighting.

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6
Q

If we increase the TE, what will this do to the SNR?

A

Decrease SNR

Increasing your TE will DECREASE the SNR
inversily related

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7
Q

If we decrease the TR, what will this do to the scan time?

A

decrease

decrease TR decrease scan time

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8
Q

If we decrease the TR, what will this do to the signal to noise ratio?

A

Decrease the SNR

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9
Q

If we decrease the TR, what will this do to the SAR?

A

increases the SAR

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10
Q

If we increase the TE, what will this do to the scan time?

A

increase

increase the TE increase the scan time

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11
Q

If we increase the TE, what will this do to the effect on detail/spatial resoultion?

A

unchanged

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12
Q

If we increase the TE, what will this do to the SAR?

A

unchanged!

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13
Q

If we increase the TE, what will this do to the T2 weighting??

A

it increases the t2 weighting and decrease the T1 weighting

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14
Q

When we increase the field of view, what does this do to the SNR?

A

it increases the SNR

increased FOV increased SNR

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15
Q

When we increase the field of view, what does this do to the area of coverage??

A

it increases the coverage area (obviously)

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16
Q

When we increase the field of view, what does this do to the effect on detail?

A

when you increase the FOV it DECREASES the spatial resolution

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17
Q

If we decrease the TE, what will this do to the T2 weighting??

A

it will decrease the T2 weighting and increase the T1 weighting

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18
Q

When we increase the field of view, what does this do to the SAR?

A

unchanged

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19
Q

When we decrease the field of view, what does this do to the SNR?

A

decreased FOV decreased SNR

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20
Q

If we increase the number of exitations ( NEX), what affect does this have on the SNR?

A

increased NEX increased SNR

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21
Q

If we increase the number of exitations ( NEX), what affect does this have on the scan time?

A

Increased NEX, increased scan time

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22
Q

If we increase the number of exitations ( NEX), what affect does this have on the spatial resolution?

A

nothing, its unchanged

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23
Q

If we increase the number of exitations, what does this do to the SAR?

A

increases the SAR

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24
Q

If we decrease the number of exitations ( NEX), what affect does this have on the SNR?

A

decreased NEX, decreased SNR

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25
Q

If we increase the number of exitations ( NEX), what affect would this have on what the image loos like?

A

It can have more motion artifact

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26
Q

If we increase the number of echo train length, what affect does this have on the SNR?

A

if we increase the ETL, it decreases SNR

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27
Q

If we increase the number of echo train length, what affect does this have on the scan time?

A

increased ETL = decreased scan time

28
Q

If we increase the number of echo train length, what affect does this have on the SAR?

A

increased SAR with increased ETL

29
Q

What is a downfall for increasing the ETL?

A

possibly more blurring in the image.

30
Q

If we increase the TI (inversion time) , what affect does this have on the SNR?

A

increased TI, decreased SNR

31
Q

If we increase the TI (inversion time) , what affect does this have on the scan time?

A

increased TI, increased time due to the increased TR required

32
Q

What affect does increasing the TI have on the spatial resolution or SAR?

A

none- no change

33
Q

When we increase the flip angle, what does that do to the SNR?

A

increased flip angle, increased SNR

34
Q

When we increase the flip angle, what does that do to the sar?

A

increased SAR increased flip angle

35
Q

When we decrease the flip angle, waht does that do to the SNR?

A

decreased flip angle, decrease SNR.

36
Q

When we decrease the flip angle, what does that do to the sar?

A

decreased flip angle decreased sar

37
Q

When we increase the flip angle what does this do to the susceptibility?

A

increased flip angle, decreased susceptibility

38
Q

Does changing the flip angle have any effect on the scan time or detail of exam?

A

no unchanged

39
Q

If we increase the phase matrix, what effect does that have on SNR?

A

increased phase matrix, DECREASED SNR

40
Q

If we increase the phase matrix, what effect does that have on scan time??

A

increased phase matrix, increased scan time.

41
Q

If we increase the phase matrix, what effect does that have on the detail / spatial resolution?

A

increase phase matrix, increased resolution

42
Q

If we DECREASE the phase matrix, what effect does that have on SNR?

A

decreased phase matrix, INCREASED SNR

43
Q

If we increase the phase matrix, what effect does that have on SAR?

A

increased matrix increased SAR

44
Q

If we increase the number of SAT bands, what does this do to the SNR?

A

the more SAT bands you have, the worse the SNR (decreases)

45
Q

If we increase the number of SAT bands, what does this do to the scan time?

A

when we increase the SAT bands, it increases the TR which makes the time go up. so increases.

46
Q

If we increase the number of SAT bands, what does this do to the effect on detail?

A

nothing, unchanged

47
Q

If we increase the number of SAT bands, what does this do to the SAR?

A

increased SAR with each number of SAT band added

48
Q

What is a positive oucome of using more Sat bands?

A

it will decrease the motion/flow artifacts

49
Q

When we increase our slice thickness, what happens to the SNR?

A

increased slice thickness, increased SNR

50
Q

When we increase our slice thickness, what happens to the scan time?

A

unchanged

51
Q

When we increase our slice thickness, what happens to the effect on detail?

A

more slice thickness less spatial resolution

52
Q

When we increase our slice thickness, what happens to the SAR

A

unchanged

53
Q

When we increase our number of slices, what effect does this have on the SNR?

A

unchanged

54
Q

When we increase our number of slices, what effect does this have on the scan time?

A

increased due to the increased need for TR.

55
Q

When we increase our number of slices, what effect does this have on the detail?

A

unchanged

56
Q

When we increase our number of slices, what effect does this have on the SAR?

A

increased SAR because its increased TR/number of slices.

57
Q

Will increasing the TR INCREASE scan time or DECREASE scan time?

A

increasing TR will increase scan time.

58
Q

Will increasing the number of slices INCREASE or decrease the scan time?

A

increasing the number of slices will increase the scan time

59
Q

Will increasing the NEX increase or decrease the scan time?

A

increasing NEX will increase scan time

60
Q

Will decreasing the ETL increase or decrease scan time?

A

decreasing the ETL will increase scan time

61
Q

If we disable half scan feature, what affect will this have on scan time ( increase it or decrease)

A

disabling half scan will increase scan time

62
Q

If we decrease the TR what effect will this have on scan time?

A

decreasing TR decreases scan time

63
Q

If we decrease the number of slices, what affect will this have on the scan time?

A

decreased slices, decreased scan time

64
Q

If we enable half scan, what will this do to the scan time?

A

enabling half scan will decrease the scan time

65
Q

if we increase the “ipat or grappa), what affect will this have on scan time?

A

increasing IPAT decreases scan time

66
Q

If we decrease the phase matrix, what affect does this have on the scan time?

A

decreased scan time

MRI QUIZ (10 decks)

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