Forwarded from قناتي الخاص
Forwarded from قناتي الخاص
Forwarded from قناتي الخاص
Forwarded from قناتي الخاص
Forwarded from قناتي الخاص
Superconducting magnets can reach field strengths up to:
Anonymous Quiz
16%
3 T
19%
5 T
9%
7 T
56%
12 T
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MRI can produce images in
Anonymous Quiz
9%
axial only
13%
sagittal only
8%
coronal only
69%
any plane
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Echo-planar imaging technique (EPI) can produce images in
Anonymous Quiz
30%
5 m
54%
30 m
2%
1 h
14%
10 s
Forwarded from قناتي الخاص
Forwarded from قناتي الخاص
MRI requires a highly homogeneous:
Anonymous Quiz
9%
A) Electric field
7%
B) Gradient field
78%
C) Static magnetic field
7%
D) RF pulse
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The process of improving magnetic field uniformity is called:
Anonymous Quiz
4%
Imaging
78%
shimming
15%
scanning
2%
Encoding
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Passive shimming is considered:
Anonymous Quiz
7%
A) Electrical adjustment
91%
B) Mechanical adjustment
0%
C) Digital adjustment
2%
D) Optical adjustment
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RF coils directly affect:
Anonymous Quiz
5%
A) Room temperature
71%
B) Image quality
18%
C) Magnet weight
7%
D) Patient comfort only
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Surface coils have:
Anonymous Quiz
8%
low signal
54%
high signal
6%
no signal
32%
Uniform signal everywhere
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Signals in quadrature coils are:
Anonymous Quiz
8%
in phase
13%
45 out of phase
73%
90 out of phase
6%
180 out of phase
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Quadrature coils produce how much more signal than single loop coils?
Anonymous Quiz
1%
2 time
89%
√2 times
7%
3 time
2%
1 1/2 time
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MRI rooms are shielded using:
Anonymous Quiz
5%
A) Lead walls
22%
B) Copper pipes
70%
C) Faraday cage
4%
D) Aluminum sheets
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Without RF shielding, MRI images may contain:
Anonymous Quiz
10%
high resolution
52%
artifacts
36%
higher SNR
2%
no signal
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What are all things in the universe made of?
Anonymous Quiz
2%
Cells
25%
molecules
70%
atom
2%
protons
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Atoms are organized in groups called:
Anonymous Quiz
2%
cells
75%
molecules
14%
elements
9%
compounds