Forwarded from قناتي الخاص
Passive shimming is considered:
Anonymous Quiz
7%
A) Electrical adjustment
91%
B) Mechanical adjustment
0%
C) Digital adjustment
2%
D) Optical adjustment
Forwarded from قناتي الخاص
RF coils directly affect:
Anonymous Quiz
5%
A) Room temperature
71%
B) Image quality
18%
C) Magnet weight
7%
D) Patient comfort only
Forwarded from قناتي الخاص
Surface coils have:
Anonymous Quiz
8%
low signal
54%
high signal
6%
no signal
32%
Uniform signal everywhere
Forwarded from قناتي الخاص
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
Forwarded from قناتي الخاص
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
Forwarded from قناتي الخاص
MRI rooms are shielded using:
Anonymous Quiz
5%
A) Lead walls
22%
B) Copper pipes
70%
C) Faraday cage
4%
D) Aluminum sheets
Forwarded from قناتي الخاص
Without RF shielding, MRI images may contain:
Anonymous Quiz
10%
high resolution
52%
artifacts
36%
higher SNR
2%
no signal
Forwarded from قناتي الخاص
What are all things in the universe made of?
Anonymous Quiz
2%
Cells
25%
molecules
70%
atom
2%
protons
Forwarded from قناتي الخاص
Atoms are organized in groups called:
Anonymous Quiz
2%
cells
75%
molecules
14%
elements
9%
compounds
Forwarded from قناتي الخاص
The particles that make up the nucleus are called:
Anonymous Quiz
16%
electrons
16%
molecules
59%
nucleuons
8%
esotopes
Forwarded from قناتي الخاص
Atoms with the same number of protons but different numbers of neutrons are called:
Anonymous Quiz
12%
lons
9%
molecules
75%
isotopes
4%
elements
Forwarded from قناتي الخاص
The human body consists of approximately how much water?
Anonymous Quiz
5%
50%
5%
60%
6%
70%
85%
80%
Forwarded from قناتي الخاص
Forwarded from قناتي الخاص
The gyromagnetic ratio of hydrogen is:
Anonymous Quiz
1%
21.5 MHz/T
6%
30.1 MHz/T
90%
42.57 MHz/T
2%
60 MHz/T
Forwarded from قناتي الخاص
In most materials such as soft tissue, magnetic moments are:
Anonymous Quiz
3%
A. Perfectly aligned
79%
B. Randomly oriented
15%
C. Parallel only
4%
D. Perpendicular only
Forwarded from قناتي الخاص
Forwarded from قناتي الخاص
The reason magnetic moments align with or against the field is due to:
Anonymous Quiz
3%
A. Gravity
24%
B. Chemical bonding
71%
C. Quantum mechanics
3%
D. Heat transfer
Forwarded from قناتي الخاص
In MRI, more magnetic moments align:
Anonymous Quiz
26%
A. Against the field
57%
B. With the field
8%
C. Sideways
9%
D. Randomly
Forwarded from قناتي الخاص
In MRI, the patient effectively becomes a:
Anonymous Quiz
9%
conductor
77%
magnet
11%
resistor
3%
capacitor