Physics 2 Quiz 2.3

1. To reduce chemical shift artifact, use the widest receive bandwidth possible and keep good SNR and use the smallest FOV possible.

True

False

2. If you are acquiring 8 slices in an acquistion and you interleave them, how are the slices acquired?

1, 3, 5, 7 then 2, 4, 6, 8

1, 2, 3, 4, then 5, 6, 7, 8

1, 2, 5, 8, then 3, 4, 6, 7

1, 4, 3, 6 then 2, 4, 6, 8

3. Respiratory compensation ______:

Ghosting artifact increased

Does affect scan time

Does not affect scan time

Number of slices per TR may be increased

4. Moire' artifact is a combination of wrap and field inhomogeneity in spin echo sequences.

True

False

5. Cardiac gating monitors cardiac motion by coordinating the excitation pulse with the _____ wave

S

T

P

R

Q

6. What sequence weighting is affected the most by magnetic susceptibility artifacts?

T2 FSE

T1 FSE

Inversion Recovery

Gradient Echo

7. At 1.0T, fat precesses at ______less than water.

110Hz

220Hz

155Hz

147Hz

160Hz

8. Aliasing along the phase axis is known as?

Aliasing

Phase wrap

Wrap around

Frequency wrap

Foldover wrap

9. What produces a ring of dark signal around certain organs where fat and water interfaces occur within same voxel?

Chemical mis-registration

Shading artifact

Magic angle artifact

Moire artifact

Zipper artifact

10.

What is the artifact seen in this image?

How is this corrected?

Submit