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MRI Quiz.com > PARAMETER TRADEOFFS > Flashcards

PARAMETER TRADEOFFS Flashcards

1
Q

IF YOU INCREASE TR WHAT HAPPENS TO SNR?

A

INCREASES SNR

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2
Q

IF YOU INCREASE TR WHAT HAPPENS TO SCAN TIME?

A

INCREASES SCAN TIME

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3
Q

IF YOU INCREASE TR WHAT HAPPENS TO IMAGE DETAIL?

A

NO CHANGE

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4
Q

IF YOU INCREASE TR WHAT HAPPENS TO SAR?

A

DECREASES SAR

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5
Q

IF YOU INCREASE TR WHAT HAPPENS TO T1 WEIGHTING?

A

DECREASES T1 WEIGHTING

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6
Q

IF YOU INCREASE TR WHAT HAPPENS TO AVAILABLE # OF SLICES?

A

INCREASES AVAILABLE # OF SLICES

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7
Q

IF YOU INCREASE TE WHAT HAPPENS TO SNR?

A

DECREASES SNR

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8
Q

IF YOU INCREASE TE WHAT HAPPENS TO SCAN TIME?

A

INDIRECTLY DECREASES SCAN TIME

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9
Q

IF YOU INCREASE TE WHAT HAPPENS TO IMAGE DETAIL?

A

NO CHANGE

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10
Q

IF YOU INCREASE TE WHAT HAPPENS TO SAR?

A

NO CHANGE

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11
Q

IF YOU INCREASE TE WHAT HAPPENS TO AVAILABLE # OF SLICES?

A

DECREASES AVAILABLE # OF SLICES

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12
Q

IF YOU INCREASE TE WHAT HAPPENS TO T2 WEIGHTING?

A

INCREASES T2 WEIGHTING

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13
Q

IF YOU INCREASE FOV WHAT HAPPENS TO SNR?

A

INCREASES SNR

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14
Q

IF YOU INCREASE FOV WHAT HAPPENS TO SCAN TIME?

A

NO CHANGE

(UNLESS VOEL SIZE IS CONSTANT)

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15
Q

IF YOU INCREASE FOV WHAT HAPPENS TO IMAGE DETAIL?

A

DECREASES SPATIAL RESOLUTION

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16
Q

IF YOU INCREASE FOV WHAT HAPPENS TO SAR?

A

NO CHANGE

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17
Q

IF YOU INCREASE FOV WHAT HAPPENS TO COVERAGE AREA?

A

INCREASES COVERAGE AREA

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18
Q

IF YOU INCREASE NSA/NEX WHAT HAPPENS TO SNR?

A

INCREASES SNR

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19
Q

IF YOU INCREASE NSA/NEX WHAT HAPPENS TO SCAN TIME?

A

INCREASES SCAN TIME

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20
Q

IF YOU INCREASE NSA/NEX WHAT HAPPENS TO IMAGE DETAIL?

A

NO CHANGE

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21
Q

IF YOU INCREASE NSA/NEX WHAT HAPPENS TO SAR?

A

INCREASES SAR

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22
Q

IF YOU INCREASE ETL/TSE WHAT HAPPENS TO SNR?

A

DECREASES SNR

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23
Q

IF YOU INCREASE ETL/TSE WHAT HAPPENS TO SCAN TIME?

A

DECREASES SCAN TIME

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24
Q

IF YOU INCREASE ETL/TSE WHAT HAPPENS TO IMAGE DETAIL?

A

NO CHANGE

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25
Q

IF YOU INCREASE ETL/TSE WHAT HAPPENS TO SAR?

A

INCREASES SAR

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26
Q

IF YOU INCREASE ETL/TSE WHAT HAPPENS TO BLURRING?

A

INCREASES IMAGE BLURRING

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27
Q

IF YOU INCREASE TI WHAT HAPPENS TO SNR?

A

DECREASES SNR

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28
Q

IF YOU INCREASE TI WHAT HAPPENS TO SCAN TIME?

A

INCREASES SCAN TIME

(DUE TO REQUIRED INCREASE OF TR)

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29
Q

IF YOU INCREASE TI WHAT HAPPENS TO IMAGE DETAIL?

A

NO CHANGE

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30
Q

IF YOU INCREASE TI WHAT HAPPENS TO SAR?

A

NO CHANGE

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31
Q

IF YOU INCREASE TI WHAT HAPPENS TO TISSUE SATURATION?

A

INCREASES TISSUE SATURATION

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32
Q

IF YOU INCREASE PHASE MATRIX WHAT HAPPENS TO SNR?

A

DECREASES SNR

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33
Q

IF YOU INCREASE PHASE MATRIX WHAT HAPPENS TO SCAN TIME?

A

INCREASES SCAN TIME

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34
Q

IF YOU INCREASE PHASE MATRIX WHAT HAPPENS TO IMAGE DETAIL?

A

INCREASES SPATIAL RESOLUTION

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35
Q

IF YOU INCREASE PHASE MATRIX WHAT HAPPENS TO SAR?

A

INCREASES SAR

INDIRECTLY

36
Q

IF YOU INCREASE PHASE MATRIX WHAT HAPPENS TO GIBBS-TRUNCATION ARTIFACTS?

A

INCREASES GIBBS-TRUNCATION ARTIFACTS

Gibbs artifacts-also known as truncation, ringing, or spectral leakage

37
Q

IF YOU INCREASE FLIP ANGLE WHAT HAPPENS TO SNR?

A

INCREASES SNR

38
Q

IF YOU INCREASE FLIP ANGLE WHAT HAPPENS TO SCAN TIME?

39
Q

IF YOU INCREASE FLIP ANGLE WHAT HAPPENS TO IMAGE DETAIL?

40
Q

IF YOU INCREASE FLIP ANGLE WHAT HAPPENS TO SAR?

A

INCREASES SAR

41
Q

IF YOU INCREASE FLIP ANGLE WHAT HAPPENS TO SUSCEPTIBILITY?

A

DECREASES SUSCEPTIBILTY

42
Q

IF YOU INCREASE rBw WHAT HAPPENS TO SNR?

A

DECREASES SNR

43
Q

IF YOU INCREASE rBw WHAT HAPPENS TO SCAN TIME?

A

DECREASES SCAN TIME

44
Q

IF YOU INCREASE rBw WHAT HAPPENS TO IMAGE DETAIL?

45
Q

IF YOU INCREASE rBw WHAT HAPPENS TO SAR?

46
Q

IF YOU INCREASE rBw WHAT HAPPENS TO CHEMICAL SHIFT & METAL ARTIFACTS?

A

DECREASES BOTH CHEMICAL SHIFT & METAL ARTIFACTS

47
Q

IF YOU INCREASE PI (PARALLEL IMAGING) REDUCTION FACTOR WHAT HAPPENS TO SNR?

A

DECREASES SNR

48
Q

IF YOU INCREASE PI (PARALLEL IMAGING) REDUCTION FACTOR WHAT HAPPENS TO SCAN TIME?

A

DECREASES SCAN TIME

49
Q

IF YOU INCREASE PI (PARALLEL IMAGING) REDUCTION FACTOR WHAT HAPPENS TO IMAGE DETIAL?

50
Q

IF YOU INCREASE PI (PARALLEL IMAGING) REDUCTION FACTOR WHAT HAPPENS TO DWI SUSCEPTIBILITY ARTIFACTS?

A

DECREASES DWI SUSCEPTIBILITY ARTIFACTS

50
Q

IF YOU INCREASE DWI B-VALUE WHAT HAPPENS TO SNR?

A

DECREASES SNR

50
Q

IF YOU INCREASE PI (PARALLEL IMAGING) REDUCTION FACTOR WHAT HAPPENS TO SAR?

A

DECREASES SAR

51
Q

IF YOU INCREASE DWI B-VALUE WHAT HAPPENS TO SCAN TIME?

A

INCREASES SCAN TIME

DUE TO REQUIRED INCREASE OF TR

52
Q

IF YOU INCREASE DWI B-VALUE WHAT HAPPENS TO IMAGE DETAIL?

53
Q

IF YOU INCREASE DWI B-VALUE WHAT HAPPENS TO SAR?

54
Q

IF YOU INCREASE DWI B-VALUE WHAT HAPPENS TO DETECTION OF STROKE/NEOPLASM?

A

INCREASES DETECTION OF STROKE/NEOPLASM

55
Q

IF YOU INCREASE # SAT BANDS WHAT HAPPENS TO SNR?

A

DECREASES SNR

56
Q

IF YOU INCREASE # SAT BANDS WHAT HAPPENS TO SCAN TIME?

A

INCREASES SCAN TIME

DUE TO REQUIRED INCREASE OF TR

57
Q

IF YOU INCREASE # SAT BANDS WHAT HAPPENS TO IMAGE DETAIL?

58
Q

IF YOU INCREASE # SAT BANDS WHAT HAPPENS TO SAR?

A

INCREASES SAR

59
Q

IF YOU INCREASE # SAT BANDS WHAT HAPPENS TO MOTION/FLOW ARTIFACTS?

A

DEREASES MOTION/FLOW ARTIFACTS

60
Q

IF YOU INCREASE SLICE THICKNESS WHAT HAPPENS TO SNR?

A

INCREASES SNR

61
Q

IF YOU INCREASE SLICE THICKNESS WHAT HAPPENS TO SCAN TIME?

62
Q

IF YOU INCREASE SLICE THICKNESS WHAT HAPPENS TO IMAGE DETAIL?

A

DECREASES SPATIAL RESOLUTION

63
Q

IF YOU INCREASE SLICE THICKNESS WHAT HAPPENS TO SAR?

64
Q

IF YOU INCREASE SLICE THICKNESS WHAT HAPPENS TO PARTIAL VOLUME ARTIFACTS?

A

INCREASES PARTIAL VOLUME ARTIFACTS

65
Q

IF YOU INCREASE # OF SLICES ACQUIRED WHAT HAPPENS TO SNR?

66
Q

IF YOU INCREASE # OF SLICES ACQUIRED WHAT HAPPENS TO SCAN TIME?

A

INCREASES SCAN TIME

DUE TO REQUIRED INCREASED OF TR

67
Q

IF YOU INCREASE # OF SLICES ACQUIRED WHAT HAPPENS TO IMAGE DETAIL?

68
Q

IF YOU INCREASE # OF SLICES ACQUIRED WHAT HAPPENS TO SAR?

A

INCREASES SAR

69
Q

IF YOU INCREASE # OF SLICES ACQUIRED WHAT HAPPENS TO ANATOMIC COVERAGE?

A

INCREASED ANATOMIC COVERAGE

70
Q

WHAT PARAMETER ARE EFFECTED BY TR?

A
  1. SNR
  2. SCAN TIME
  3. SAR
  4. # OF SLICES
  5. T1 WEIGHTING
71
Q

WHAT PARAMETER ARE EFFECTED BY TE?

A
  1. SNR
  2. SCAN TIME
  3. # OF SLICES
  4. T2 WEIGHTING
72
Q

WHAT PARAMETER ARE EFFECTED BY FOV?

A
  1. SNR
  2. IMAGE DETAIL (SPATIAL RESOLUTION)
  3. COVERAGE AREA
73
Q

WHAT PARAMETER ARE EFFECTED BY NSA/NEX?

A
  1. SNR
  2. SCAN TIME
  3. SAR
  4. MOTION
74
Q

WHAT PARAMETER ARE EFFECTED BY ETL/TSE?

A
  1. SNR
  2. SCAN TIME
  3. SAR
  4. BLURRING
75
Q

WHAT PARAMETER ARE EFFECTED BY TI?

A
  1. SNR
  2. SCAN TIME
  3. TISSUE SATURATION
76
Q

WHAT PARAMETER ARE EFFECTED BY PHASE MATRIX?

A
  1. SNR
  2. SCAN TIME
  3. IMAGE DETAIL (SPATIAL RESOLUTION)
  4. SAR
  5. GIBBS ARTIFACT
77
Q

WHAT PARAMETER ARE EFFECTED BY FLIP ANGLE?

A
  1. SNR
  2. SAR
  3. SUSCEPTIBILITY
78
Q

WHAT PARAMETER ARE EFFECTED BY rBw?

A
  1. SNR
  2. SCAN TIME
  3. CHEMICAL SHIFT/METAL ARTIFACTS
79
Q

WHAT PARAMETER ARE EFFECTED BY PI (PARALELL IMAGING)?

A
  1. SNR
  2. SCAN TIME
  3. SAR
  4. DWI SUSCEPTIBILITY ARTIFACTS
80
Q

WHAT PARAMETER ARE EFFECTED BY DWI b-VALUE?

A
  1. SNR
  2. SCAN TIME
  3. STROKE/NEOPLASM DETECTION
81
Q

WHAT PARAMETER ARE EFFECTED BY # SAT BANDS?

A
  1. SNR
  2. SCAN TIME
  3. SAR
  4. MOTION/FLOW ARTIFACTS
82
Q

WHAT PARAMETER ARE EFFECTED BY SLICE THICKNESS?

A
  1. SNR
  2. IMAGE DETAIL (SPATIAL RESOLUTION)
  3. PARTIAL VOLUME ARTIFACTS
83
Q

WHAT PARAMETER ARE EFFECTED BY # OF SLICES ACQUIRED?

A
  1. SCAN TIME
  2. SAR
  3. ANATOMIC COVERAGE

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