______ will eliminate the wraparound artifact from the top and bottom of a coronal knee image
(assuming that the frequency encoding is accomplished with the z gradient, and using the coordinate
axis convention above).
1. Increasing the FOV
2. Applying the no frequency wrap option
3. Applying a single saturation region - 1,2, & 3
______ would be most effective at reducing the artifact depicted in Fig 12-20 - ECG triggering
The frequency encoding direction in the image in Fig 12-20 is: - Vertical
Which of the following is NOT a method that may reduce motion artifacts? - Applying the no frequency
wrap option
If the frequency and phase directions were swapped, but all other parameters remained constant, and
the scan was repeated, the flow artifacts n Fig 12-21 would: - Extend horizontally across the posterior
aspect of the brain
Which of the following strategies acts to reduce truncation artifacts? - Applying a raw data filter
_______ artifacts are evident in the patient's left knee in Fig 12-22. - Metal
The artifact in the conventional spin echo image in Fig 12-22 can be eliminated by: - Removing the
offending metal from the patient
______ pulse sequence display the effects of magnetic susceptibility - Spoiled gradient echo
, Which of the following is FALSE regarding a metal artifact in an MR image? - A metal artifact may appear
as a scattering of RF energy, while all of the signal from the anatomical structures remains intact
An MRI artifact is: - An anomaly in a MR image
____ would NOT help to reduce the severity of flow artifacts in T2 weighted images of the brain - A
narrower receiver bandwidth
______ artifact may occur in the MR images as a direct result of acquiring them with the scan room door
open - RF
A chemical shift artifact will appear in the: - Frequency encoding gradient
An artifact caused by respiratory motion will appear in the: - Phase encoding direction
The line running through the image in Fig 12-23 represents a ______ artifact - RF
The readout direction in Fig 12-23 is: - Horizontal
_______ will reduce or eliminate the artifact in the image in Fig 12-23 - Properly using RF shielding
Which of the following approaches is a possible remedy for an aliasing artifact?
1. Increase the FOV
2. Apply the no phase wrap option
3. Apply a saturation pulse - 1,2, & 3
The scan time with the no frequency wrap option applied is _____ the scan time if the no frequency
wrap option is not applied - The same as
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