MRI chapte Flashcards
1
Q
Does MRI ionize
A
No
2
Q
MRI was originaly known as
A
Nuclear magnetic resonance (NMR)
3
Q
Proton density
A
Number of precessing protons in a given volume of tissue
4
Q
Relaxation rate
A
Release of energy by the excited protons
5
Q
Flow phenomena
A
With standard pulse sequences flowing blood in vessels produces a weak signal and canbe identified from surrounding stationary tissues
6
Q
3 types of magnets
A
Resistive, superconductive, permanent
7
Q
Cryogenic magnets also known as
A
Superconductive magnet
8
Q
Cryogenic magnets are
A
Very cold
9
Q
Units to measure magnetic field strength
A
Tesla (T) and gauss (G)
10
Q
Thicker slices are
A
Better, contain more info less grainy and have greater signal
11
Q
How many coil sets are used in MRI
A
3, X, Y, and Z
12
Q
Most common contrast agent used in MRI
A
Gadolinium
