Q1
A patient undergoing lumbar spine MRI has arms wrapped around the torso appearing folded into the image from the opposite side. Which correction resolves this?
AApply a saturation band over the arms or increase the phase FOV to include the arms
BIncrease TR to allow more complete signal recovery from the arms
CDecrease bandwidth to narrow the frequency range and exclude the arm signal
DSwitch from FSE to spin echo for better phase encoding accuracy
Q2
Which parameter change is most effective at reducing Gibbs truncation artifact?
AIncrease the phase encoding matrix size to improve spatial frequency sampling
BDecrease the receiver bandwidth to improve signal sampling accuracy
CIncrease the number of signal averages to smooth out ringing in the image
DIncrease the field of view to reduce wrap-around near the image borders
Q3
What artifact is demonstrated in this image?
AChemical shift artifact
BAliasing artifact
CZipper artifact
DSusceptibility artifact
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Q4
A Dixon reconstruction incorrectly labels fat as water and water as fat in part of the image. What artifact has occurred?
