A method of reducing MRI scan time by not filling as many lines of k-space in the
phase direction, while maintaining spatial resolution, is known as
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Rectangular FOV
What exam does not require Gad?
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Arnold chiari
What sequence removes any residual transverse magnetization?
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A spoiled gradient echo
Partial volume averaging artifacts occur when multiple tissue types are contained
within a single voxel.
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Thicker slices contribute more heavily to partial volume
averaging
What sequences yield T1 contrast due to the removal of residual transverse
magnetization before the next excitation?
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Incoherent gradient echo (or spoiled gradient echo)
What imaging tool can be used to decrease magnetic suseptability artifact?
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parallel imaging
, Decreasing Receiver Bandwidth:
Disadvantages:
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Disadvantages:
- Decreasing the bandwidth increases the sampling time Ts and lengthens
the sequence timing, creating longer minimum TR and TE values
-Longer echo spacing (more blurring)
-Increased susceptibility artifacts
-More chemical shift
-More metal artifacts
As the TE is increased, the available number of slices?
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are decreased (longer TE
means fewer slices can fit into the TR period)
What is the time between two 90º RF excitation pulses.
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repetition time (TR)
The difference in chemical shift is approximately ?
phase direction, while maintaining spatial resolution, is known as
Give this one a try later!
Rectangular FOV
What exam does not require Gad?
Give this one a try later!
Arnold chiari
What sequence removes any residual transverse magnetization?
,Give this one a try later!
A spoiled gradient echo
Partial volume averaging artifacts occur when multiple tissue types are contained
within a single voxel.
Give this one a try later!
Thicker slices contribute more heavily to partial volume
averaging
What sequences yield T1 contrast due to the removal of residual transverse
magnetization before the next excitation?
Give this one a try later!
Incoherent gradient echo (or spoiled gradient echo)
What imaging tool can be used to decrease magnetic suseptability artifact?
Give this one a try later!
parallel imaging
, Decreasing Receiver Bandwidth:
Disadvantages:
Give this one a try later!
Disadvantages:
- Decreasing the bandwidth increases the sampling time Ts and lengthens
the sequence timing, creating longer minimum TR and TE values
-Longer echo spacing (more blurring)
-Increased susceptibility artifacts
-More chemical shift
-More metal artifacts
As the TE is increased, the available number of slices?
Give this one a try later!
are decreased (longer TE
means fewer slices can fit into the TR period)
What is the time between two 90º RF excitation pulses.
Give this one a try later!
repetition time (TR)
The difference in chemical shift is approximately ?
