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30 Cards in this Set

  • Front
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What are the advantages to an increase in TR?
Increased SNR
Increased number of slices per acquisition
What are the disadvantages to an increase TR?
Increased scan time
Decreased T1 weighting
What are the advantages to a decrease in TR?
Decreased scan time
Increased T1 weighting
What are the disadvantages to a decrease in TR?
Decreased SNR
Decreased number of slices per acquisition
What are the advantages of an increase in TE?
Increased T2 weighting
What are the disadvantages of an increase in TE?
Decreased SNR
What are the advantages of a decreased TE?
Increased SNR
What are the disadvantages of a decreased TE?
Decreased T2 weighting
What are the advantages of increased NEX?
Increased SNR of all tissues
REduced flow artifact due to signal averaging
What are the disadvantages of increased NEX?
Direct proportional increase in scan time
What are the advantages of decreased NEX?
Direct proportional decrease in scan time
What are the disadvantages of decreased NEX?
Decreased SNR in all tissues
Increased flow artifact due to less signal averaging
What are the advantages of increasing slice thickness?
Increased SNR in all tissues
Increased coverage of anatomy
What are the disadvantages of increasing slice thickness?
Decreased spatial resolution and partial voluming in slice select direction
What are the advantages of decreasing slice thickness?
Increased spatial resolution and reduced partial voluming in slice select direction
What are the disadvantages of decreasing slice thickness?
Decreased SNR in all tissues
Increased flow artifact due to less signal averaging
What are the advantages of increasing the FOV?
Increased SNR
Increased coverage of anatomy
What are the disadvantages of increasing the FOV?
Decreased spatial resolution
Decreased likelihood of aliasing
What are the advantages of decreasing the FOV?
Decreased SNR in all tissues
Decreased coverage of anatomy
What are the disadvantages of decreasing the FOV?
Increased spatial resolution
Increased likelihood of aliasing
What are the advantages of increasing the Matrix?
Increased spatial resolution
What are the disadvantages of increasing the matrix?
Increased scan time
Decreased SNR if pixel size decreases. If pixel size remains the same, SNR will increase because more phase encodings are performed.
What are the advantages of decreasing the matrix?
Decreased scan time
Increased SNR in all tissues if pixel size increases. If pixel size remains the same, SNR decreases as fewer phase encodings are performed.
What are the disadvantages of decreasing the matrix?
Decreased spatial resolution
What are the advantages of increasing receive bandwidth?
Decrease of minimum TE
Decrease in chemical shift
What are the disadvantages of increasing receive bandwidth?
Decreased SNR
What are the advantages of decreasing receive bandwidth?
Increased SNR
What are the disadvantages of decreasing receive bandwidth?
Increase in minimum TE
Increase in chemical shift
How could you increase SNR?
Increase TR
Decrease TE
Increase slice thickness
Increase FOV
Decrease Matrix (if pixel size increases)
Decrease Bandwidth
How could you decrease scan time?
Decrease TR
Decrease NEX
Decrease Matrix